Re: SDL and new Thread open two windows
On Saturday, 2 September 2017 at 03:47:24 UTC, Adam D. Ruppe wrote: On Saturday, 2 September 2017 at 03:41:47 UTC, SrMordred wrote: Whats going on , and how to prevent this ? Are you using a static this anywhere? Hm, right. I was constructing the window there. Forgot that static this will execute on all threads. Thanks! Removing the code from "static this" solved. putting "__gshared" also. But "shared" crashes the programs...
Re: SDL and new Thread open two windows
On Saturday, 2 September 2017 at 03:41:47 UTC, SrMordred wrote: Whats going on , and how to prevent this ? Are you using a static this anywhere?
SDL and new Thread open two windows
Im using SDL2 with derelict, on ubuntu.
Last DMD.
When using spawn or new Thread like :
spawn( (){
while(true){
Thread.sleep(500.msecs);
});
the program open two SDL windows.
Whats going on , and how to prevent this ?
Re: 24-bit int
On Saturday, 2 September 2017 at 02:37:08 UTC, Mike Parker wrote: On Saturday, 2 September 2017 at 01:19:52 UTC, EntangledQuanta wrote: The whole point is so that there is no wasted space, so if it requires that then it's not a waste of space but a bug. Audio that is in24 is 3 bytes per sample, not 4. Every 3 bytes are a sample, not every 3 out of 4. Basically a byte[] cast to a int24 array should be 1/3 the size and every 3 bytes are the same as an int24. Thanks for pointing this out if it is necessary. It's not a bug, but a feature. Data structure alignment is important for efficient reads, so several languages (D, C, C++, Ada, and more) will automatically pad structs so that they can maintain specific byte alignments. On a 32-bit system, 4-byte boundaries are the default. So a struct with 3 ubytes is going to be padded with an extra byte at the end. Telling the compiler to align on a 1-byte boundary (essentially disabling alignment) will save you space, but will will generally cost you cycles in accessing the data. You fail to read correctly. A bug in his code. If he is treating in24's as int32's and simply ignoring the upper byte then it is not a true int24 and all the work he did would be pointless. I can do that by simply reading an int32 and masking the high bit.
Re: 24-bit int
On Saturday, 2 September 2017 at 02:49:41 UTC, Ilya Yaroshenko wrote: On Friday, 1 September 2017 at 19:39:14 UTC, EntangledQuanta wrote: Is there a way to create a 24-bit int? One that for all practical purposes acts as such? This is for 24-bit stuff like audio. It would respect endianness, allow for arrays int24[] that work properly, etc. Hi, Probably you are looking for bitpack ndslice topology: http://docs.algorithm.dlang.io/latest/mir_ndslice_topology.html#.bitpack sizediff_t[] data; // creates a packed signed integer slice with max allowed value equal to `2^^24 - 1`. auto packs = data[].sliced.bitpack!24; packs has the same API as D arrays Package is Mir Algorithm http://code.dlang.org/packages/mir-algorithm Best, Ilya Thanks. Seems useful.
Re: 24-bit int
On Friday, 1 September 2017 at 19:39:14 UTC, EntangledQuanta wrote: Is there a way to create a 24-bit int? One that for all practical purposes acts as such? This is for 24-bit stuff like audio. It would respect endianness, allow for arrays int24[] that work properly, etc. Hi, Probably you are looking for bitpack ndslice topology: http://docs.algorithm.dlang.io/latest/mir_ndslice_topology.html#.bitpack sizediff_t[] data; // creates a packed signed integer slice with max allowed value equal to `2^^24 - 1`. auto packs = data[].sliced.bitpack!24; packs has the same API as D arrays Package is Mir Algorithm http://code.dlang.org/packages/mir-algorithm Best, Ilya
Re: 24-bit int
On Saturday, 2 September 2017 at 01:19:52 UTC, EntangledQuanta wrote: The whole point is so that there is no wasted space, so if it requires that then it's not a waste of space but a bug. Audio that is in24 is 3 bytes per sample, not 4. Every 3 bytes are a sample, not every 3 out of 4. Basically a byte[] cast to a int24 array should be 1/3 the size and every 3 bytes are the same as an int24. Thanks for pointing this out if it is necessary. It's not a bug, but a feature. Data structure alignment is important for efficient reads, so several languages (D, C, C++, Ada, and more) will automatically pad structs so that they can maintain specific byte alignments. On a 32-bit system, 4-byte boundaries are the default. So a struct with 3 ubytes is going to be padded with an extra byte at the end. Telling the compiler to align on a 1-byte boundary (essentially disabling alignment) will save you space, but will will generally cost you cycles in accessing the data.
Re: Template substitution for function parameters
On Friday, 1 September 2017 at 11:33:15 UTC, Biotronic wrote:
On Friday, 1 September 2017 at 10:15:09 UTC, Nicholas Wilson
wrote:
So I have the following types
struct DevicePointer(T) { T* ptr; }
struct Buffer(T)
{
void* driverObject;
T[] hostMemory;
}
and a function
auto enqueue(alias k)(HostArgsOf!k) { ... }
where k would be a function like
void foo( DevicePointer!float a, float b , int c) { ... }
How can I write HostArgsOf such that HostArgsOf!foo yields:
AliasSeq!(Buffer!float, float, int)
preferably in such a way that I can add additional
transformations to it later on?
i.e. it substitutes the template DevicePointer for the
template Buffer in Parameters!foo,
The templates can be assumed to not be nested templates, i.e.
DevicePointer!(DevicePointer!(float)) will never occur neither
will Buffer!(Buffer!(float) or any cross templates)
template k(alias fn) {
import std.meta, std.traits;
alias k = staticMap!(ReplaceTemplate!(DevicePointer,
Buffer), Parameters!fn);
}
template ReplaceTemplate(alias needle, alias replacement) {
template ReplaceTemplate(alias T) {
static if (is(T : needle!Args, Args...)) {
alias ReplaceTemplate = replacement!Args;
} else {
alias ReplaceTemplate = T;
}
}
}
Hmm, it seems I oversimplified the example a bit and this doesn't
quite work for my actual usecase.
struct DevicePointer(int n,T) { T* ptr; }
alias GlobalPointer(T) = DevicePointer!(1,T);
k!foo yields
DevicePointer!(cast(AddrSpace)1u, float), float, int
instead of
Buffer!float, float, int
I think because the is(T : needle!Args, Args...) fails.
Re: replace switch for mapping
I came up with a library solution that isn't pretty ;/
I offer it up to the gods, but being gods, they probably don't
care.
template EnumMapper(alias func, string[] args, eT...)
{
import std.meta, std.typecons, std.traits, std.string,
std.algorithm, std.array, std.conv;
private auto recSwitch(string[] args, int depth, alias N,
T...)(string[] attrs = null)
{
string str;
auto tab = replicate("\t", depth);
static if (T.length == 0)
{
string at;
foreach(k, a; args)
{
at ~= "cast(Parameters!("~func~"!("~attrs.join(",
")~"))["~to!string(k)~"])"~a;
if (k < args.length-1) at ~= ", ";
}
return tab~"\treturn "~func~"!("~attrs.join(",
")~")("~at~");\n";
}
else
{
str ~= tab~"switch("~N[0]~")\n"~tab~"{\n"~tab~"\tdefault:
break;\n";
foreach(v; __traits(allMembers, T[0]))
{
mixin(`enum attr = __traits(getAttributes,
T[0].`~v~`).stringof[6..$-1].strip();`);
static if (attr != "")
{
str ~= tab~"\t"~"case "~v~":\n";
attrs ~= attr[1..$-1];
str ~= recSwitch!(args, depth + 2 , N[1..$],
T[1..$])(attrs);
attrs = attrs[0..$-1];
str ~= tab~"\t\tbreak;\n";
}
}
str ~= tab~"}\n";
return str;
}
}
private auto genMapper(string[] args, alias N, T...)()
{
string str;
foreach(e; AliasSeq!(eT[0..eT.length/2]))
str ~= "with("~e.stringof~") ";
auto code = recSwitch!(args, 0, N, T)();
return str~"\n"~code;
}
auto EnumMapper()
{
return "import std.traits;\n"~genMapper!(args,
[eT[eT.length/2..$]], eT[0..eT.length/2])();
}
}
Because D only half-assley implements __traits for templates, a
lot of it is hacks and kludges.
It is used like
struct enumA
{
int value;
alias value this;
@("float") enum Float = cast(enumA)0;
@("int") enum Int = cast(enumA)1;
}
struct enumB
{
int value;
alias value this;
@("double") enum Double = cast(enumB)0;
@("byte") enum Byte = cast(enumB)1;
}
auto foo(T1, T2)(T1 a, T2 b)
{
import std.conv;
return to!string(a)~" - "~to!string(b);
}
void main()
{
auto res = ()
{
int a = 4;
double b = 1.23;
enumA enumAVal = enumA.Float;
enumB enumBVal = enumB.Byte;
mixin(EnumMapper!("foo", ["a", "b"], enumA, enumB,
"enumAVal", "enumBVal")());
return "";
}();
writeln(res);
getchar();
}
and basically generates the nested switch structure:
-
with(enumA) with(enumB)
switch(enumAVal)
{
default: break;
case Float:
switch(enumBVal)
{
default: break;
case Double:
return foo!(float, double)(cast(Parameters!(foo!(float,
double))[0])a, cast(Parameters!(foo!(float, double))[1])b);
break;
case Byte:
return foo!(float, byte)(cast(Parameters!(foo!(float,
byte))[0])a, cast(Parameters!(foo!(float, byte))[1])b);
break;
}
break;
case Int:
switch(enumBVal)
{
default: break;
case Double:
return foo!(int, double)(cast(Parameters!(foo!(int,
double))[0])a, cast(Parameters!(foo!(int, double))[1])b);
break;
case Byte:
return foo!(int, byte)(cast(Parameters!(foo!(int,
byte))[0])a, cast(Parameters!(foo!(int, byte))[1])b);
break;
}
break;
}
-
and so it maps the arbitrary (a,b) to the correct foo. The idea
is simple: Given a templated function, we want map the arbitrary
values, assuming they can be properly cast to the templated
function depending on the enum values.
the enum values control which foo is called. But this works at
runtime!
This is useful when one has many different representations of
data that all can be overloaded, but one doesn't kno
Re: 24-bit int
On Saturday, 2 September 2017 at 00:43:00 UTC, Nicholas Wilson
wrote:
On Friday, 1 September 2017 at 22:10:43 UTC, Biotronic wrote:
On Friday, 1 September 2017 at 19:39:14 UTC, EntangledQuanta
wrote:
Is there a way to create a 24-bit int? One that for all
practical purposes acts as such? This is for 24-bit stuff
like audio. It would respect endianness, allow for arrays
int24[] that work properly, etc.
I haven't looked at endianness beyond it working on my
computer. If you have special needs in that regard, consider
this a starting point:
struct int24 {
ubyte[3] _payload;
this(int x) {
value = x;
}
...
}
--
Biotronic
You may also want to put an align(1) on it so that you dont
waste 25% of the allocated memory in an array of int24's
The whole point is so that there is no wasted space, so if it
requires that then it's not a waste of space but a bug.
Audio that is in24 is 3 bytes per sample, not 4. Every 3 bytes
are a sample, not every 3 out of 4.
Basically a byte[] cast to a int24 array should be 1/3 the size
and every 3 bytes are the same as an int24.
Thanks for pointing this out if it is necessary.
Re: 24-bit int
On Friday, 1 September 2017 at 22:10:43 UTC, Biotronic wrote:
On Friday, 1 September 2017 at 19:39:14 UTC, EntangledQuanta
wrote:
Is there a way to create a 24-bit int? One that for all
practical purposes acts as such? This is for 24-bit stuff like
audio. It would respect endianness, allow for arrays int24[]
that work properly, etc.
I haven't looked at endianness beyond it working on my
computer. If you have special needs in that regard, consider
this a starting point:
struct int24 {
ubyte[3] _payload;
this(int x) {
value = x;
}
...
}
--
Biotronic
You may also want to put an align(1) on it so that you dont waste
25% of the allocated memory in an array of int24's
Re: Bug in D!!!
On Friday, 1 September 2017 at 23:25:04 UTC, Jesse Phillips wrote: I've love being able to inherit and override generic functions in C#. Unfortunately C# doesn't use templates and I hit so many other issues where Generics just suck. I don't think it is appropriate to dismiss the need for the compiler to generate a virtual function for every instantiated T, after all, the compiler can't know you have a finite known set of T unless you tell it. But lets assume we've told the compiler that it is compiling all the source code and it does not need to compile for future linking. First the compiler will need to make sure all virtual functions can be generated for the derived classes. In this case the compiler must note the template function and validate all derived classes include it. That was easy. Next up each instantiation of the function needs a new v-table entry in all derived classes. Current compiler implementation will compile each module independently of each other; so this feature could be specified to work within the same module or new semantics can be written up of how the compiler modifies already compiled modules and those which reference the compiled modules (the object sizes would be changing due to the v-table modifications) With those three simple changes to the language I think that this feature will work for every T. Specifying that there will be no further linkage is the same as making T finite. T must be finite. C# uses generics/IR/CLR so it can do things at run time that is effectively compile time for D. By simply extending the grammar slightly in an intuitive way, we can get the explicit finite case, which is easy: foo(T in [A,B,C])() and possibly for your case foo(T in )() would work or foo(T in )() the `in` keyword makes sense here and is not used nor ambiguous, I believe. Regardless of the implementation, the idea that we should throw the baby out with the bathwater is simply wrong. At least there are a few who get that. By looking in to it in a serious manner an event better solution might be found. Not looking at all results in no solutions and no progress.
Re: Bug in D!!!
I've love being able to inherit and override generic functions in C#. Unfortunately C# doesn't use templates and I hit so many other issues where Generics just suck. I don't think it is appropriate to dismiss the need for the compiler to generate a virtual function for every instantiated T, after all, the compiler can't know you have a finite known set of T unless you tell it. But lets assume we've told the compiler that it is compiling all the source code and it does not need to compile for future linking. First the compiler will need to make sure all virtual functions can be generated for the derived classes. In this case the compiler must note the template function and validate all derived classes include it. That was easy. Next up each instantiation of the function needs a new v-table entry in all derived classes. Current compiler implementation will compile each module independently of each other; so this feature could be specified to work within the same module or new semantics can be written up of how the compiler modifies already compiled modules and those which reference the compiled modules (the object sizes would be changing due to the v-table modifications) With those three simple changes to the language I think that this feature will work for every T.
Re: get parameter names
On Friday, 1 September 2017 at 22:21:18 UTC, Biotronic wrote:
On Friday, 1 September 2017 at 20:58:20 UTC, EntangledQuanta
wrote:
template(A, B...)
{
auto foo(C...)(C c)
{
... get c's parameter names, should be alpha, beta
}
}
foo!(., .)(alpha, beta)
I need the actual identifiers passed to foo. I can get the
types(obviously C) but when I try to get the identifier
names(__traits(identifier or other methods) I stuff get
_param_k or errors.
I need both C's types and the parameter identifier names past,
else I'd just pass as strings.
Like Jonathan M Davis points out, this is impossible for
regular parameters. For template alias parameters, on the other
hand, this works:
void bar(alias fn)() {
assert(fn.stringof == "alpha");
}
unittest {
int alpha;
bar!(alpha);
}
--
Biotronic
The problem I have with this is that when I try to pass variables
in the template complains that there is no "this"
So, what I have resorted to doing is passing the type and the
name, which seems redundant:
bar!(int, "alpha")
rather than
bar!(alpha) or bar(alpha)
alpha is a variable in a object in my case.
I've tried basically something like the following
void bar(alias fn)()
{
typeof(fn) should return int and
fn.stringof should return "alpha"
}
although my code is more complex since I have multiple template
parameters(using a variadic).
Re: 24-bit int
On Friday, 1 September 2017 at 22:10:43 UTC, Biotronic wrote: On Friday, 1 September 2017 at 19:39:14 UTC, EntangledQuanta wrote: [...] I haven't looked at endianness beyond it working on my computer. If you have special needs in that regard, consider this a starting point: [...] Thanks, I'll check it out and see.
Re: get parameter names
On Friday, 1 September 2017 at 20:58:20 UTC, EntangledQuanta
wrote:
template(A, B...)
{
auto foo(C...)(C c)
{
... get c's parameter names, should be alpha, beta
}
}
foo!(., .)(alpha, beta)
I need the actual identifiers passed to foo. I can get the
types(obviously C) but when I try to get the identifier
names(__traits(identifier or other methods) I stuff get
_param_k or errors.
I need both C's types and the parameter identifier names past,
else I'd just pass as strings.
Like Jonathan M Davis points out, this is impossible for regular
parameters. For template alias parameters, on the other hand,
this works:
void bar(alias fn)() {
assert(fn.stringof == "alpha");
}
unittest {
int alpha;
bar!(alpha);
}
--
Biotronic
Re: 24-bit int
On Friday, 1 September 2017 at 19:39:14 UTC, EntangledQuanta
wrote:
Is there a way to create a 24-bit int? One that for all
practical purposes acts as such? This is for 24-bit stuff like
audio. It would respect endianness, allow for arrays int24[]
that work properly, etc.
I haven't looked at endianness beyond it working on my computer.
If you have special needs in that regard, consider this a
starting point:
struct int24 {
ubyte[3] _payload;
this(int x) {
value = x;
}
@property
int value() {
int val = *cast(int*)&_payload & 0xFF;
if (val & 0x80) {
val |= 0xFF00;
}
return val;
}
@property
int value(int x) {
_payload = (cast(ubyte*)&x)[0..3];
return value;
}
auto opUnary(string op)() {
static if (op == "++") {
value = value + 1;
} else static if (op == "--") {
value = value - 1;
} else static if (op == "+") {
return value;
} else static if (op == "-") {
return -value;
} else static if (op == "~") {
return ~value;
} else {
static assert(false, "Unary operator '"~op~"' is not
supported by int24.");
}
}
auto opOpAssign(string op)(int x) {
static assert(__traits(compiles, {mixin("value = value
"~op~" x;");}), "Binary operator '"~op~"' is not supported by
int24.");
mixin("value = value "~op~" x;");
return this;
}
alias value this;
}
unittest {
int24[3] a;
assert(a.sizeof == 9);
// Max value
a[1] = 8388607;
assert(a[1] == 8388607);
// Test for buffer overflow:
assert(a[0] == 0);
assert(a[2] == 0);
// Overflow
a[1] = 8388608;
assert(a[1] == -8388608);
// Test for buffer overflow:
assert(a[0] == 0);
assert(a[2] == 0);
// negative value
a[1] = -1;
assert(a[1] == -1);
// Test for buffer overflow:
assert(a[0] == 0);
assert(a[2] == 0);
// Unary operators
a[1] = 0;
assert(~a[1] == -1);
a[1]--;
assert(a[1] == -1);
assert(-a[1] == 1);
assert(+a[1] == -1);
a[1]++;
assert(a[1] == 0);
// Binary operators
a[1] = 0;
a[1] = a[1] + 1;
assert(a[1] == 1);
a[1] += 1;
assert(a[1] == 2);
a[1] = a[1] - 1;
assert(a[1] == 1);
a[1] -= 1;
assert(a[1] == 0);
a[1] = 3;
a[1] = a[1] * 2;
assert(a[1] == 6);
a[1] = a[1] / 2;
assert(a[1] == 3);
a[1] *= 2;
assert(a[1] == 6);
a[1] /= 2;
assert(a[1] == 3);
a[1] = a[1] << 1;
assert(a[1] == 6);
a[1] <<= 1;
assert(a[1] == 12);
a[1] = a[1] >> 1;
assert(a[1] == 6);
a[1] >>= 1;
assert(a[1] == 3);
a[1] |= 4;
assert(a[1] == 7);
a[1] &= 5;
assert(a[1] == 5);
a[1] = a[1] | 2;
assert(a[1] == 7);
a[1] = a[1] & 3;
assert(a[1] == 3);
}
--
Biotronic
Re: -betterC not working
On Wednesday, 30 August 2017 at 23:12:07 UTC, SrMordred wrote: On Wednesday, 30 August 2017 at 22:45:27 UTC, Adam D. Ruppe wrote: On Wednesday, 30 August 2017 at 22:18:07 UTC, SrMordred wrote: DMD64 D Compiler v2.075.1 -betterC as described recently is not yet released. https://dlang.org/changelog/2.076.0_pre.html is where it gets the new behavior, and that isn't scheduled for formal release until the end of the week. (it seriously bothers me that Walter has been advertising this so much when the little bit that is implemented isn't even released yet, and what is implemented is barely usable.) The betterC switch itself is not new, but it does virtually nothing until that latest prerelease compiler. ooops, little missed detail ;) At least its near. Hello again. Downloaded last version. //fail at my example, so its working as intended dmd -betterC source/app.d app.d //compiles. so problem with dub only dub run --config=application --arch=x86_64 --build=debug --compiler=dmd
Re: Help Required on Getopt
On Friday, 1 September 2017 at 19:04:39 UTC, Daniel Kozak wrote: I have same issue. How this help you? Catching exception does not help. How do I catch exception and still print help message? Your are correct, sorry about that. What my response showed is how to avoid printing the full stack trace and instead printing a more nicely formatted error message. And separately, how to print formatted help. But, you are correct in that you can't directly print the formatted help text from the catch block as shown. In particular, the GetoptResult returned by getopt is not available. I don't have any examples that try to work around this. Presumably one could call getopt again to get the options list, then generate the formatted help. It'd be an annoyance, though perhaps judicious use of AliasSeq might make the code structure reasonable. --Jon
Re: get parameter names
On Friday, September 01, 2017 20:58:20 EntangledQuanta via Digitalmars-d-
learn wrote:
> template(A, B...)
> {
> auto foo(C...)(C c)
> {
> ... get c's parameter names, should be alpha, beta
> }
> }
>
>
> foo!(., .)(alpha, beta)
>
> I need the actual identifiers passed to foo. I can get the
> types(obviously C) but when I try to get the identifier
> names(__traits(identifier or other methods) I stuff get _param_k
> or errors.
>
> I need both C's types and the parameter identifier names past,
> else I'd just pass as strings.
Those would actually be the arguments, not the parameters (c would be the
parameters), but regardless, there's no way to do that. The function being
called knows nothing about the caller. The only case that's even vaguely
like that are the __FILE__ and __LINE__ directives which evaluate at the
call site rather at the declaration site if they're used to default
initialize a parameter (whereas in C++, they evaluate at the declaration
site, which is a lot less useful). The function knows what its parameters
are, but it knows nothing about what the arguments that were used to
initialize the parameters were.
If you want the names of the arguments to be passed to the function, you're
going to have to pass them yourself.
- Jonathan M Davis
Easy bug: reference to local variable
Nothing new here but I almost fell prey to this bug today. Spot the bug:
import std.stdio;
import std.range;
int[3] bar() {
return [ 1, 2, 3 ];
}
auto foo() {
auto a = bar();
return zip(a[], a[]);
}
void main() {
writeln(foo());
}
In the real code, bar() was a call to std.datetime.benchmark, which also
returns a static array. (The compiler is helpful in the trivial case of
foo returning a[] instead of hiding it through zip.)
DIP 1000 is targeting such bugs:
https://github.com/dlang/DIPs/blob/master/DIPs/DIP1000.md
Ali
get parameter names
template(A, B...)
{
auto foo(C...)(C c)
{
... get c's parameter names, should be alpha, beta
}
}
foo!(., .)(alpha, beta)
I need the actual identifiers passed to foo. I can get the
types(obviously C) but when I try to get the identifier
names(__traits(identifier or other methods) I stuff get _param_k
or errors.
I need both C's types and the parameter identifier names past,
else I'd just pass as strings.
Re: Simplest multithreading example
On 09/01/2017 07:27 AM, Brian wrote:
double [] hugeCalc(int i){
// Code that takes a long time
}
so if I do
double[][int] _hugeCalcCache;
foreach(i ; I)
_hugeCalcCache[i] = hugeCalc(i);
of course the required time is I.length * (a long time), so I wanted to
shorten this by splitting to different threads :
foreach(i ; parallel(I) )
_hugeCalcCache[i] = hugeCalc(i);
but as you can guess, it doesn't work that easily.
Works pretty well for me:
double [] hugeCalc(int i)
{
// Code that takes a long time
import core.thread: Thread;
import std.datetime: seconds;
Thread.sleep(1.seconds);
return [i];
}
void main()
{
static import std.range;
import std.parallelism: parallel;
auto I = std.range.iota(0, 10);
double[][int] _hugeCalcCache;
foreach(i ; parallel(I))
_hugeCalcCache[i] = hugeCalc(i);
}
That runs in about 3 seconds here. The serial version would of course
take about 10 seconds. So, parallelism achieved!
Though I don't know if it's safe to access an associative array
concurrently like that. I'd use a normal dynamic array instead and
initialize it before going parallel:
auto _hugeCalcCache = new double[][](10);
Re: Bug in D!!!
This happens when building, not running. This might be a Visual D issue as when I use dmd from the command line, it works fine ;/
24-bit int
Is there a way to create a 24-bit int? One that for all practical purposes acts as such? This is for 24-bit stuff like audio. It would respect endianness, allow for arrays int24[] that work properly, etc.
Re: Bug in D!!!
On Friday, 1 September 2017 at 19:25:53 UTC, Adam D Ruppe wrote:
On Friday, 1 September 2017 at 18:17:22 UTC, EntangledQuanta
wrote:
I get an access violation, changed the code to
What is the rest of your code? access violation usually means
you didn't new the class...
No, that is the code! I added nothing. Try it out and you'll see.
I just upgraded to released dmd too.
alias I(A...) = A;
interface Foo {
static foreach(T; I!(int, float))
void set(T t); // define virt funcs for a list of
types
}
class Ass : Foo {
static foreach(T; I!(int, float))
void set(T t) {
// simplement
}
}
void main()
{
}
try it.
Re: traits for function having actual source declaration?
On Friday, 1 September 2017 at 18:06:04 UTC, Jonathan M Davis
wrote:
[...]
You can use std.meta.Filter if you need to filter anything out
of an AliasSeq like this, and whether you should be filtering
out those functions is highly dependent on what you're doing -
e.g. sometimes, you really want to get your hands on __ctor,
whereas other times, that's not at all what you're looking for.
But because it gives you everything, you have a choice, whereas
if they were filtered out, then any code that needed to know
about them would be screwed.
- Jonathan M Davis
I'm working on a runtime reflection library, so there won't be
any access to the actual type. Any access to constructors will
have to be done through an interface like these:
class Struct : Reflection {
size_t size() const;
void construct(void[] mem);
}
class Class : Reflection {
Object createInstance() const;
}
The library is basically done, but needs polishing. Also, I'm
stuck waiting for things like __traits() being allowed to bypass
protection, which was recently decided upon, but not yet
implemented (hopefully this hasn't been overturned again).
Thanks
Re: Bug in D!!!
On Friday, 1 September 2017 at 18:17:22 UTC, EntangledQuanta wrote: I get an access violation, changed the code to What is the rest of your code? access violation usually means you didn't new the class...
Re: Help Required on Getopt
I have same issue. How this help you? Catching exception does not help. How do I catch exception and still print help message? Dne 1. 9. 2017 8:10 odpoledne napsal uživatel "Vino.B via Digitalmars-d-learn" : On Friday, 1 September 2017 at 17:23:01 UTC, Jon Degenhardt wrote: > On Friday, 1 September 2017 at 13:13:39 UTC, Vino.B wrote: > >> Hi All, >> >> When i run the below program without any arguments "D1.d -r" it is >> throwing error, but i need it to show the help menu >> >> [snip...] >> > > Hi Vino, > > To get good error message behavior you need to put the construct in a > try-catch block. Then you can choose how to respond. An example here: > https://github.com/eBay/tsv-utils-dlang/blob/master/tsv-appe > nd/src/tsv-append.d#L138-L194. This code prints outs the error message > from the exception. In your case: "Missing value for argument -r.". But, > you could also print out the help text as well. There is an example of that > as well in the above code block, look for the 'if (r.helpWanted)' test. > > --Jon > Hi, Thank you very much, that helped me to resolve the issue.
Re: Bug in D!!!
On Friday, 1 September 2017 at 15:24:39 UTC, Adam D. Ruppe wrote:
static foreach is now in the new release! You can now do stuff
like:
---
alias I(A...) = A;
interface Foo {
static foreach(T; I!(int, float))
void set(T t); // define virt funcs for a list
of types
}
class Ass : Foo {
static foreach(T; I!(int, float))
void set(T t) {
// simplement
}
}
---
really easily.
I get an access violation, changed the code to
import std.meta;
static foreach(T; AliasSeq!("int", "float"))
mixin("void set("~T~" t);");
and also get an access violation ;/
Re: Help Required on Getopt
On Friday, 1 September 2017 at 17:23:01 UTC, Jon Degenhardt wrote: On Friday, 1 September 2017 at 13:13:39 UTC, Vino.B wrote: Hi All, When i run the below program without any arguments "D1.d -r" it is throwing error, but i need it to show the help menu [snip...] Hi Vino, To get good error message behavior you need to put the construct in a try-catch block. Then you can choose how to respond. An example here: https://github.com/eBay/tsv-utils-dlang/blob/master/tsv-append/src/tsv-append.d#L138-L194. This code prints outs the error message from the exception. In your case: "Missing value for argument -r.". But, you could also print out the help text as well. There is an example of that as well in the above code block, look for the 'if (r.helpWanted)' test. --Jon Hi, Thank you very much, that helped me to resolve the issue.
Re: traits for function having actual source declaration?
On Friday, September 01, 2017 14:38:38 bitwise via Digitalmars-d-learn wrote: > When I'm using __traits(allMembers), I get a all the invisible > functions added by the compiler as well "__ctor", "__xdtor", > "__cpctor", etc.. > > Is there a way to filter them out? You can use std.meta.Filter if you need to filter anything out of an AliasSeq like this, and whether you should be filtering out those functions is highly dependent on what you're doing - e.g. sometimes, you really want to get your hands on __ctor, whereas other times, that's not at all what you're looking for. But because it gives you everything, you have a choice, whereas if they were filtered out, then any code that needed to know about them would be screwed. - Jonathan M Davis
Re: Simplest multithreading example
On 08/31/2017 10:27 PM, Brian wrote: > the 'real' problem is trying > to split a huge calculation to different threads. I still think you can take advantage of std.parallelism: https://dlang.org/phobos/std_parallelism.html Unfortunately, its features like asyncBuf, map, and amap do not stand out in the documentation. Here's my interpretation of them: http://ddili.org/ders/d.en/parallelism.html Ali
Re: traits for function having actual source declaration?
On Friday, 1 September 2017 at 17:26:11 UTC, ketmar wrote: [...] they *should* listen. anyone who doesn't just aksing for troubles, and i see no reason to guard 'em further. Yeah...eventually came to the same conclusion ;) Thanks
Re: traits for function having actual source declaration?
bitwise wrote: On Friday, 1 September 2017 at 14:38:38 UTC, bitwise wrote: When I'm using __traits(allMembers), I get a all the invisible functions added by the compiler as well "__ctor", "__xdtor", "__cpctor", etc.. Is there a way to filter them out? dlang's "Lexical" page says: "Identifiers starting with __ (two underscores) are reserved." So I suppose I could just filter out functions with leading underscores, but still seems unreliable, as people may not listen. they *should* listen. anyone who doesn't just aksing for troubles, and i see no reason to guard 'em further.
Re: Help Required on Getopt
On Friday, 1 September 2017 at 13:13:39 UTC, Vino.B wrote: Hi All, When i run the below program without any arguments "D1.d -r" it is throwing error, but i need it to show the help menu [snip...] Hi Vino, To get good error message behavior you need to put the construct in a try-catch block. Then you can choose how to respond. An example here: https://github.com/eBay/tsv-utils-dlang/blob/master/tsv-append/src/tsv-append.d#L138-L194. This code prints outs the error message from the exception. In your case: "Missing value for argument -r.". But, you could also print out the help text as well. There is an example of that as well in the above code block, look for the 'if (r.helpWanted)' test. --Jon
Re: Bug in D!!!
static foreach is now in the new release! You can now do stuff
like:
---
alias I(A...) = A;
interface Foo {
static foreach(T; I!(int, float))
void set(T t); // define virt funcs for a list of
types
}
class Ass : Foo {
static foreach(T; I!(int, float))
void set(T t) {
// simplement
}
}
---
really easily.
Re: vibed services stop response after several days of work
On 01-09-17 10:01, Suliman wrote: I got same problem on Windows Server 2016 and on Linux Debian 8.5. I have few very simple backend based on vibed 0.8.1, compiler dmd 2.075.1. nginx servise is do port forwarding. Nothing more is used. After several days of working I am begining to get "502 Bad Gateway" error. The service is not down, it's continue to working, but on Windows task manager I seen very low memory usage (0.4MB) and on Linux I see next: https://snag.gy/ban3jX.jpg (i am not familiar with Linux and do not sure if process is alive or not because htop do not show it) The code is *very* simple https://github.com/bubnenkoff/dlang.ru Is there any ideas how to diagnostic the problem? For the linux screenshot ps also includes the grep process you are pipping the ps output to. So your vibe.d instance isn't running. Are you running an release build? If so you might get a better idea of whats going on when using a plain or debug build. -- Mike Wey
Re: vibed services stop response after several days of work
It's seems that it's error in libevent on Linux. I tried to add to dub.sdl: versions "libasync" and it's seems that not it's working (but I need more time to test).
Re: traits for function having actual source declaration?
On Friday, 1 September 2017 at 14:38:38 UTC, bitwise wrote: When I'm using __traits(allMembers), I get a all the invisible functions added by the compiler as well "__ctor", "__xdtor", "__cpctor", etc.. Is there a way to filter them out? dlang's "Lexical" page says: "Identifiers starting with __ (two underscores) are reserved." So I suppose I could just filter out functions with leading underscores, but still seems unreliable, as people may not listen.
traits for function having actual source declaration?
When I'm using __traits(allMembers), I get a all the invisible functions added by the compiler as well "__ctor", "__xdtor", "__cpctor", etc.. Is there a way to filter them out?
Help Required on Getopt
Hi All,
When i run the below program without any arguments "D1.d -r" it
is throwing error, but i need it to show the help menu
Program:
import std.stdio;
import std.getopt;
string r;
void main (string[] args)
{
getopt(args, std.getopt.config.caseInsensitive,
std.getopt.config.stopOnFirstNonOption, "r" , &r);
switch (r) {
case "Test1" : Test1; break;
case "Test2" : Test2; break;
default : writeln("Unknown operation"); Help;
}
}
void Test1 ()
{ writeln("This is Test 1"); }
void Test2 ()
{ writeln("This is Test 2"); }
void Help ()
{ writeln("This is Help Menu"); }
Execution:
Works fine if i execute the program with below options
rdmd D1.d
rdmd D1.d -r Test1
rdmd D1.d -r Test2
rdmd D1.d -r Help
but fails with below error when i execute the program as rdmd
D1.d -r
Requirement :
If i execute the program as "rdmd D1.d -r" is should show me the
"Help" Menu rather than the below error/
Output:
C:\Admin\Desktop\Current\Script\D>rdmd D1.d -r
object.Exception@C:\D\dmd2\windows\bin\..\..\src\phobos\std\getopt.d(880):
Missing value for argument -r.
0x00402493
0x004043AC
0x00402999
0x004025FE
0x004025C5
0x0040239B
0x00402236
0x0040B47F
0x0040B443
0x0040B344
0x00405E07
0x76CB336A in BaseThreadInitThunk
0x77CF9902 in RtlInitializeExceptionChain
0x77CF98D5 in RtlInitializeExceptionChain
From,
Vino.B
Re: Valid File Path
On Thursday, 31 August 2017 at 23:45:01 UTC, Jonathan M Davis wrote: On Thursday, August 31, 2017 23:23:17 Vino via Digitalmars-d-learn wrote: [...] And why would that not be valid? isValidPath and isValidFilename are quite specific about what they think are valid path/file names, and having a # in a file name is perfectly legitimate. They do have some extra restrictions for Windows, since Windows is a lot pickier about its filenames than the rest of the world, but # is not one of the characters listed as invalid: https://dlang.org/phobos/std_path.html#isValidPath https://dlang.org/phobos/std_path.html#isValidFilename It would be invalid to have # as a drive name, but it's perfectly legal in a filename or directory name. - Jonathan M Davis Hi, Thank you very much for the explanation, was able to resolve the issue.
Re: gcd with doubles
On Friday, 1 September 2017 at 09:33:08 UTC, Alex wrote: On Sunday, 27 August 2017 at 23:13:24 UTC, Moritz Maxeiner wrote: On Sunday, 27 August 2017 at 19:47:59 UTC, Alex wrote: [...] To expand on the earlier workaround: You can also adapt a floating point to string algorithm in order to dynamically determine an upper bound on the number of after decimal point digits required. Below is an untested adaption of the reference C implementation of errol0[1] for that purpose (MIT license as that is what the original code is under): [...] Hey, cool! Thanks for the efforts :) No problem, two corrections to myself, though: 1) It's a lower bound, not an upper bound (you need at least that many digits in order to not lose precision) 2) The code is missing `_ > ulong.min` checks along the existing `_ < ulong.max` checks
Re: Template substitution for function parameters
On Friday, 1 September 2017 at 11:33:15 UTC, Biotronic wrote:
On Friday, 1 September 2017 at 10:15:09 UTC, Nicholas Wilson
wrote:
So I have the following types
struct DevicePointer(T) { T* ptr; }
struct Buffer(T)
{
void* driverObject;
T[] hostMemory;
}
and a function
auto enqueue(alias k)(HostArgsOf!k) { ... }
where k would be a function like
void foo( DevicePointer!float a, float b , int c) { ... }
How can I write HostArgsOf such that HostArgsOf!foo yields:
AliasSeq!(Buffer!float, float, int)
preferably in such a way that I can add additional
transformations to it later on?
i.e. it substitutes the template DevicePointer for the
template Buffer in Parameters!foo,
The templates can be assumed to not be nested templates, i.e.
DevicePointer!(DevicePointer!(float)) will never occur neither
will Buffer!(Buffer!(float) or any cross templates)
template k(alias fn) {
import std.meta, std.traits;
alias k = staticMap!(ReplaceTemplate!(DevicePointer,
Buffer), Parameters!fn);
}
template ReplaceTemplate(alias needle, alias replacement) {
template ReplaceTemplate(alias T) {
static if (is(T : needle!Args, Args...)) {
alias ReplaceTemplate = replacement!Args;
} else {
alias ReplaceTemplate = T;
}
}
}
Thanks!
Re: Template substitution for function parameters
On Friday, 1 September 2017 at 10:15:09 UTC, Nicholas Wilson
wrote:
So I have the following types
struct DevicePointer(T) { T* ptr; }
struct Buffer(T)
{
void* driverObject;
T[] hostMemory;
}
and a function
auto enqueue(alias k)(HostArgsOf!k) { ... }
where k would be a function like
void foo( DevicePointer!float a, float b , int c) { ... }
How can I write HostArgsOf such that HostArgsOf!foo yields:
AliasSeq!(Buffer!float, float, int)
preferably in such a way that I can add additional
transformations to it later on?
i.e. it substitutes the template DevicePointer for the template
Buffer in Parameters!foo,
The templates can be assumed to not be nested templates, i.e.
DevicePointer!(DevicePointer!(float)) will never occur neither
will Buffer!(Buffer!(float) or any cross templates)
template k(alias fn) {
import std.meta, std.traits;
alias k = staticMap!(ReplaceTemplate!(DevicePointer, Buffer),
Parameters!fn);
}
template ReplaceTemplate(alias needle, alias replacement) {
template ReplaceTemplate(alias T) {
static if (is(T : needle!Args, Args...)) {
alias ReplaceTemplate = replacement!Args;
} else {
alias ReplaceTemplate = T;
}
}
}
Re: Template substitution for function parameters
On Friday, 1 September 2017 at 10:58:51 UTC, user1234 wrote: On Friday, 1 September 2017 at 10:15:09 UTC, Nicholas Wilson wrote: So I have the following types ... i.e. it substitutes the template DevicePointer for the template Buffer in Parameters!foo, The templates can be assumed to not be nested templates, i.e. DevicePointer!(DevicePointer!(float)) will never occur neither will Buffer!(Buffer!(float) or any cross templates) Wow, this Question triggers an immediate headache...What about this ? import std.traits: Parameters; alias HostArgsOf(alias A) = AliasSeq!(Parameters!A[0], Parameters!A[1], Parameters!A[2]); It will probably take the form alias HostArgsOf(alias k) = staticMap!(something, Parameters!k); I'm just not sure how to formulate the something.
Re: Bug in D!!!
On Thursday, 31 August 2017 at 15:48:12 UTC, EntangledQuanta
wrote:
On Thursday, 31 August 2017 at 10:34:14 UTC, Kagamin wrote:
On Thursday, 31 August 2017 at 00:49:22 UTC, EntangledQuanta
wrote:
I've already implemented a half ass library solution.
It can be improved alot.
Then, by all means, genius!
Enjoy!
mixin template virtualTemplates(alias parent, alias fn, T...) {
import std.meta;
alias name = Alias!(__traits(identifier, fn)[1..$]);
mixin virtualTemplates!(parent, name, fn, T);
}
mixin template virtualTemplates(alias parent, string name, alias
fn, T...) {
import std.traits;
static if (is(parent == interface)) {
template templateOverloads(string name : name) {
alias templateOverloads = T;
}
alias Types = T;
} else {
alias Types = templateOverloads!name;
}
mixin(virtualTemplatesImpl(name, Types.length, is(parent ==
class)));
}
string virtualTemplatesImpl(string name, int n, bool implement) {
import std.format;
string result;
foreach (i; 0..n) {
auto body = implement ? format(" { return
fn!(Types[%s])(args); }", i) : ";";
result ~= format("ReturnType!(fn!(Types[%s]))
%s(Parameters!(fn!(Types[%s])) args)%s\n", i, name, i, body);
}
return result;
}
interface I {
void _Go(T)(T s);
void _Leave(T)(T s);
mixin virtualTemplates!(I, _Go, int, short, float, double);
mixin virtualTemplates!(I, "Abscond", _Leave, int, short,
float, double);
}
class C : I {
void _Go(T)(T s) { }
void _Leave(T)(T s) { }
mixin virtualTemplates!(C, _Go);
mixin virtualTemplates!(C, "Abscond", _Leave);
}
unittest {
I c = new C();
c.Go(3.2);
c.Abscond(3.4f);
}
Does not support multiple template parameters, or template value
parameters. Use at own risk for any and all purposes.
Re: Template substitution for function parameters
On Friday, 1 September 2017 at 10:15:09 UTC, Nicholas Wilson wrote: So I have the following types ... i.e. it substitutes the template DevicePointer for the template Buffer in Parameters!foo, The templates can be assumed to not be nested templates, i.e. DevicePointer!(DevicePointer!(float)) will never occur neither will Buffer!(Buffer!(float) or any cross templates) Wow, this Question triggers an immediate headache...What about this ? import std.traits: Parameters; alias HostArgsOf(alias A) = AliasSeq!(Parameters!A[0], Parameters!A[1], Parameters!A[2]);
Re: vibed services stop response after several days of work
On Friday, 1 September 2017 at 08:01:24 UTC, Suliman wrote: I got same problem on Windows Server 2016 and on Linux Debian 8.5. I have few very simple backend based on vibed 0.8.1, compiler dmd 2.075.1. nginx servise is do port forwarding. Nothing more is used. After several days of working I am begining to get "502 Bad Gateway" error. The service is not down, it's continue to working, but on Windows task manager I seen very low memory usage (0.4MB) and on Linux I see next: https://snag.gy/ban3jX.jpg (i am not familiar with Linux and do not sure if process is alive or not because htop do not show it) The code is *very* simple https://github.com/bubnenkoff/dlang.ru Is there any ideas how to diagnostic the problem? I got error https://paste.ofcode.org/exCL5S2vbp6qhYBqj7v6ez Is it's issue with libevent? Does even-loop depend on used OS?
Re: Synax for variadic template
On Friday, 1 September 2017 at 10:01:16 UTC, Nicholas Wilson wrote: b.arr refers to an `(AliasSeq!(int, double))[]`, so with `b.arr[0] ~= 5;` you are trying to append a integer to an array of pairs of ints and doubles, which you can't do. b.arr[0] ~= ElementType!(typeof(b.arr))(5,42.0); should work (I hope, not tested) but you cannot append only the int. If you are trying to abstract the array for struct of array vs. array of struct the take a look at https://maikklein.github.io/post/soa-d/ Ok... I think I need some type of soa, yes. But in the article, there is too much of effort done, to convert types to arrays, at least at the stage of my code... At the end, if I compare the amount of code in the article and just "[]" more, as for the part of my example that works... Thanks for the cool link, nevertheless... Cool to see, how it should be done :)
Template substitution for function parameters
So I have the following types
struct DevicePointer(T) { T* ptr; }
struct Buffer(T)
{
void* driverObject;
T[] hostMemory;
}
and a function
auto enqueue(alias k)(HostArgsOf!k) { ... }
where k would be a function like
void foo( DevicePointer!float a, float b , int c) { ... }
How can I write HostArgsOf such that HostArgsOf!foo yields:
AliasSeq!(Buffer!float, float, int)
preferably in such a way that I can add additional
transformations to it later on?
i.e. it substitutes the template DevicePointer for the template
Buffer in Parameters!foo,
The templates can be assumed to not be nested templates, i.e.
DevicePointer!(DevicePointer!(float)) will never occur neither
will Buffer!(Buffer!(float) or any cross templates)
Re: Synax for variadic template
On Friday, 1 September 2017 at 09:38:59 UTC, Alex wrote:
Hi all!
Say, I have
struct A(T...)
{
T arr;
}
struct B(T...)
{
T[] arr;
}
void main()
{
A!(int[], double[]) a;
a.arr[0] ~= 5;
a.arr[0] ~= 6;
static assert(!__traits(compiles, a.arr[0] ~= 3.5));
a.arr[1] ~= 19.8;
assert(a.arr[0] == [5,6]);
assert(a.arr[1] == [19.8]);
assert(a.arr[1].length == 1);
assert(a.arr[0].length == 2);
B!(int, double) b;
//b.arr[0] ~= 5;
}
While struct A behaves like expected, how to get by with B?
What I want is just to abstract the array property out of
template arguments...
Thanks in advance :)
b.arr refers to an `(AliasSeq!(int, double))[]`, so with
`b.arr[0] ~= 5;` you are trying to append a integer to an array
of pairs of ints and doubles, which you can't do.
b.arr[0] ~= ElementType!(typeof(b.arr))(5,42.0);
should work (I hope, not tested) but you cannot append only the
int.
If you are trying to abstract the array for struct of array vs.
array of struct the take a look at
https://maikklein.github.io/post/soa-d/
Synax for variadic template
Hi all!
Say, I have
struct A(T...)
{
T arr;
}
struct B(T...)
{
T[] arr;
}
void main()
{
A!(int[], double[]) a;
a.arr[0] ~= 5;
a.arr[0] ~= 6;
static assert(!__traits(compiles, a.arr[0] ~= 3.5));
a.arr[1] ~= 19.8;
assert(a.arr[0] == [5,6]);
assert(a.arr[1] == [19.8]);
assert(a.arr[1].length == 1);
assert(a.arr[0].length == 2);
B!(int, double) b;
//b.arr[0] ~= 5;
}
While struct A behaves like expected, how to get by with B?
What I want is just to abstract the array property out of
template arguments...
Thanks in advance :)
Re: gcd with doubles
On Sunday, 27 August 2017 at 23:13:24 UTC, Moritz Maxeiner wrote: On Sunday, 27 August 2017 at 19:47:59 UTC, Alex wrote: [...] To expand on the earlier workaround: You can also adapt a floating point to string algorithm in order to dynamically determine an upper bound on the number of after decimal point digits required. Below is an untested adaption of the reference C implementation of errol0[1] for that purpose (MIT license as that is what the original code is under): [...] Hey, cool! Thanks for the efforts :)
Re: Parse tree node allocator
On Thursday, 31 August 2017 at 15:55:26 UTC, Stefan Koch wrote: On Thursday, 31 August 2017 at 15:43:05 UTC, Per Nordlöw wrote: Which allocator is best suited for allocating tree nodes (all of equal size around 40-60 bytes in size) in one shot and then delete them all in one go? My use case is parse trees. Region Allocator. A region over `Mallocator` or a paged allocator to avoid overhead in calling `malloc`?
vibed services stop response after several days of work
I got same problem on Windows Server 2016 and on Linux Debian 8.5. I have few very simple backend based on vibed 0.8.1, compiler dmd 2.075.1. nginx servise is do port forwarding. Nothing more is used. After several days of working I am begining to get "502 Bad Gateway" error. The service is not down, it's continue to working, but on Windows task manager I seen very low memory usage (0.4MB) and on Linux I see next: https://snag.gy/ban3jX.jpg (i am not familiar with Linux and do not sure if process is alive or not because htop do not show it) The code is *very* simple https://github.com/bubnenkoff/dlang.ru Is there any ideas how to diagnostic the problem?
