Re: scope block do not handle failure, but try-catch does
On 13.12.2014 23:26, Suliman wrote:
I reread docs and understood that scope not for such case.
Next code is do what I need:
try
{
string dbname = config.getKey("dbname");
string dbpass = config.getKey("dbpass");
string dbhost = config.getKey("dbhost");
string dbport = config.getKey("dbport");
}
catch (Exception msg)
{
writeln("Can't parse config: %s", msg.msg);
}
What you need probably is the following:
string dbpass, dbhost, dbport;
{ // This bracket is intended to define new scope
// New if in the current scope from now any failure occurs
// the compiler will call writeln with message
scope(failure) writeln("Can't parse config: %s", msg.msg);
dbname = config.getKey("dbname");
dbpass = config.getKey("dbpass");
dbhost = config.getKey("dbhost");
dbport = config.getKey("dbport");
} // the current scope ends, so if a failure happens later writeln won't
be called
Re: Fast matrix struct
On Sunday, 14 December 2014 at 22:14:55 UTC, Ryan wrote:
I'm writing a Matrix struct that I plan to use for some number
crunching, which will be intensive at times. So I want it to be
fast.
Will I do better by manually managing the memory myself with
malloc and free in the constructors/destructor or just using
plain D arrays?
The manual way I could bypass the GC and bounds checks. I don't
need (or want) any of the fancy appending concatenation and the
potential slowdowns from the heap allocations that comes with
the builtin arrays.
But I have to wonder, if I just don't use those features, will
it be just as fast with the GC (assuming I compile out the
bounds checks with the -release compiler option)?
Right now my strategy is to malloc one large chunk of memory in
the constructor (and postblit) and treat the 2-d matrix as a
1-d array internally. Then just use pointer arithmetic to
access the elements.
I know the best way to know is just to test. But writing both
versions would take a LOT of work, and I'm looking for guidance
about which path will probably be most fruitful.
Thanks,
Just a hint about "a LOT of work":
--
struct Hop {
version(noGC) // defined with a custom compiler switch
-version=noGC
private T[] arr;
else
std.container.Array!T arr;
}
--
The GC-free array already exist in the standard library.
Re: Fastest Way to Append Multiple Elements to an Array
On Sunday, 14 December 2014 at 23:52:15 UTC, zeljkog wrote:
On 15.12.14 00:16, "Nordlöw" wrote:
or some other trick?
void append(T, Args...)(ref T[] arr, Args args){
arr.length += args.length;
foreach(i, e; args)
arr[$ - args.length + i] = args[i];
}
void main()
{
int[] arr = [1, 2, 3, 4, 5];
arr.append(3, 10, 14);
writeln(arr);
}
output:
[1, 2, 3, 4, 5, 3, 10, 14]
Maybe *std.array.Appender* should be used in append().
(http://dlang.org/phobos/std_array.html#.Appender)
Even if i often myself feel too lazy to use it and use only the
concat. op instead.
Re: Fastest Way to Append Multiple Elements to an Array
On 15.12.14 01:00, "Nordlöw" wrote: Isn't this algorithm already encoded somewhere in Phobos? I don't know.
Re: Fastest Way to Append Multiple Elements to an Array
On Sunday, 14 December 2014 at 23:52:15 UTC, zeljkog wrote:
void append(T, Args...)(ref T[] arr, Args args){
arr.length += args.length;
foreach(i, e; args)
arr[$ - args.length + i] = args[i];
}
Isn't this algorithm already encoded somewhere in Phobos?
Re: Fastest Way to Append Multiple Elements to an Array
On 15.12.14 00:16, "Nordlöw" wrote:
> or some other trick?
void append(T, Args...)(ref T[] arr, Args args){
arr.length += args.length;
foreach(i, e; args)
arr[$ - args.length + i] = args[i];
}
void main()
{
int[] arr = [1, 2, 3, 4, 5];
arr.append(3, 10, 14);
writeln(arr);
}
output:
[1, 2, 3, 4, 5, 3, 10, 14]
Fastest Way to Append Multiple Elements to an Array
What's the fastest way to append multiple elements to an array?: Either arr ~= e1; arr ~= e2; arr ~= e3; or arr ~= [e1,e2,e3]; or some other trick?
Fast matrix struct
I'm writing a Matrix struct that I plan to use for some number crunching, which will be intensive at times. So I want it to be fast. Will I do better by manually managing the memory myself with malloc and free in the constructors/destructor or just using plain D arrays? The manual way I could bypass the GC and bounds checks. I don't need (or want) any of the fancy appending concatenation and the potential slowdowns from the heap allocations that comes with the builtin arrays. But I have to wonder, if I just don't use those features, will it be just as fast with the GC (assuming I compile out the bounds checks with the -release compiler option)? Right now my strategy is to malloc one large chunk of memory in the constructor (and postblit) and treat the 2-d matrix as a 1-d array internally. Then just use pointer arithmetic to access the elements. I know the best way to know is just to test. But writing both versions would take a LOT of work, and I'm looking for guidance about which path will probably be most fruitful. Thanks,
Re: Compact Printing of Tuples
Nordlöw: Why arent' Tuples defaultly printed as (1, 2) instead Tuple!(int, int)(1, 2) ? What's the most convenient of tweak this behaviour so I get untyped-printing. Is there a function to convert a Tuple to into a D parameter tuple? I'd like a shorter representation of tuples expecially when you have an array of them. A single tuple is acceptable to print it in the longer current form. You can open an enhancement request. Bye, bearophile
Re: How can I define a label inside a switch?
On Sun, 14 Dec 2014 18:48:15 + Meta via Digitalmars-d-learn wrote: > On Sunday, 14 December 2014 at 18:41:54 UTC, MachineCode wrote: > > The labels are disabled then? I find that goto case case_value > > ugly and prefer goto labelName; but if it's the only way to go > > let's do it > > I'm not sure if it's intentionally not supported, or just an > oversight. Probably the former, so you should use "goto case". I > agree it is annoying having to type out the expression for which > case to go to; I can't remember if there was any rationale given > for disallowing such a case. i believe that this is just an oversight. technically that label belongs to the previous case, so that case is assumed to have some code after `break` or `goto`, even if there is no real code follows. not sure if it worth fixing though. signature.asc Description: PGP signature
Re: How can I define a label inside a switch?
On Sunday, 14 December 2014 at 18:41:54 UTC, MachineCode wrote: The labels are disabled then? I find that goto case case_value ugly and prefer goto labelName; but if it's the only way to go let's do it I'm not sure if it's intentionally not supported, or just an oversight. Probably the former, so you should use "goto case". I agree it is annoying having to type out the expression for which case to go to; I can't remember if there was any rationale given for disallowing such a case.
Re: How can I define a label inside a switch?
On Sunday, 14 December 2014 at 18:27:28 UTC, ketmar via
Digitalmars-d-learn wrote:
On Sun, 14 Dec 2014 18:24:39 +
MachineCode via Digitalmars-d-learn
wrote:
I used to do it in C but in D it's giving this compile error
message:
> switch case fallthrough - 'use goto case;' if intended
Here's the code:
> switch(value) {
> // alof of cases here
> // ...
> white: // regular label
>case 'a': case 'c':
>case 'd': case 'k':
>do_something();
>break;
> case 'e':
>do_something2();
> break;
> default: assert(0);
> }
How is it fall through if there's a break? does D switch
differ from C in any way?
why do you need that? you can use literally what compiler told
you:
`goto case 'a';` for example.
The labels are disabled then? I find that goto case case_value
ugly and prefer goto labelName; but if it's the only way to go
let's do it
Re: How can I define a label inside a switch?
On Sun, 14 Dec 2014 18:24:39 +
MachineCode via Digitalmars-d-learn
wrote:
> I used to do it in C but in D it's giving this compile error
> message:
>
> > switch case fallthrough - 'use goto case;' if intended
>
> Here's the code:
>
> > switch(value) {
> > // alof of cases here
> > // ...
> > white: // regular label
> > case 'a': case 'c':
> > case 'd': case 'k':
> > do_something();
> > break;
> > case 'e':
> >do_something2();
> > break;
> > default: assert(0);
> > }
>
> How is it fall through if there's a break? does D switch differ
> from C in any way?
why do you need that? you can use literally what compiler told you:
`goto case 'a';` for example.
signature.asc
Description: PGP signature
How can I define a label inside a switch?
I used to do it in C but in D it's giving this compile error
message:
switch case fallthrough - 'use goto case;' if intended
Here's the code:
switch(value) {
// alof of cases here
// ...
white: // regular label
case 'a': case 'c':
case 'd': case 'k':
do_something();
break;
case 'e':
do_something2();
break;
default: assert(0);
}
How is it fall through if there's a break? does D switch differ
from C in any way?
DUB not passing "dflags": ["-fPIC"] for gdc, ldmd2 only for DMD
I'm coming from this thread:
http://forum.dlang.org/thread/zzjeajhjpzhnvgxqu...@forum.dlang.org
I a nutshell:
- DUB didn't compile my dynamic library project, and Martin
linked me this issue:
https://github.com/D-Programming-Language/dub/issues/352. The
workaround is to put: "dflags": ["-fPIC"] in dub.json
- It builds and works if dub uses DMD. But if I invoke it with
--complier=gdc, or --compiler=ldmd2, then the linker issue arise
again, DUB not emit -fPIC I think.
dub.json:
{
"name": "node-d-sample",
"description": "A minimal D application.",
"copyright": "Copyright © 2014, gabor",
"authors": ["gabor"],
"dependencies": {
},
"libs": [ "phobos2" ],
"targetName": "node-d-sample",
"targetPath": "lib",
"targetType": "dynamicLibrary",
"dflags": ["-fPIC"]
}
dub --compiler=gdc:
Performing main compilation...
dub build "node-d-sample" --arch=x86_64 --compiler=gdc
"--build=release"
Building package node-d-sample in
/home/gabor/sandbox/node-d-sample/
Building node-d-sample ~master configuration "library", build
type release.
Running gdc...
/usr/bin/ld:
/usr/lib/gcc/x86_64-linux-gnu/4.9/libgphobos2.a(minfo.o):
relocation R_X86_64_32 against
`_D32TypeInfo_APxS6object10ModuleInfo6__initZ' can not be used
when making a shared object; recompile with -fPIC
/usr/lib/gcc/x86_64-linux-gnu/4.9/libgphobos2.a: error adding
symbols: Bad value
collect2: error: ld returned 1 exit status
FAIL
.dub/build/library-release-linux.posix-x86_64-gdc_2065-33A38D9D3DC714C1501A18C957A2B35B/
node-d-sample dynamicLibrary
Error executing command build: gdc failed with exit code 1.
Exit code 2
Build complete -- 1 error, 0 warnings
dub --compiler=ldmd2:
Performing main compilation...
dub build "node-d-sample" --arch=x86_64 --compiler=ldmd2
"--build=release"
The determined compiler type "ldc" doesn't match the expected
type "dmd". This will probably result in build errors.
Building package node-d-sample in
/home/gabor/sandbox/node-d-sample/
Building node-d-sample ~master configuration "library", build
type release.
Running ldmd2...
/usr/bin/ld:
/home/gabor/dev/ldc2-0.15.0-beta1-linux-x86_64/bin/../lib/libdruntime-ldc.a(eh.o):
relocation R_X86_64_32 against `.rodata..str1' can not be used
when making a shared object; recompile with -fPIC
/home/gabor/dev/ldc2-0.15.0-beta1-linux-x86_64/bin/../lib/libdruntime-ldc.a:
error adding symbols: Bad value
collect2: error: ld returned 1 exit status
Error: /usr/bin/gcc failed with status: 1
FAIL
.dub/build/library-release-linux.posix-x86_64-ldc_2066-212B345732639D80C27025028ED586A2/
node-d-sample dynamicLibrary
Error executing command build: ldmd2 failed with exit code 1.
Exit code 2
Build complete -- 1 error, 0 warnings
Re: Are there any methods like isDestroyed or isDisposed to detect whether some object is destroyed or not?
On Sunday, 14 December 2014 at 16:05:13 UTC, Dan Olson wrote:
"Marc "Schütz\"" writes:
On Saturday, 13 December 2014 at 21:20:43 UTC, Andrey
Derzhavin wrote:
import std.stdio;
class ObjectAType {
bool ok;
this() {ok = true;}
}
void main()
{
auto a = new ObjectAType;
assert(a.ok);
destroy(a);
assert(!a.ok); // a has been destroyed.
}
This method of detection of collected objects is what I
needed.
Thanks to everybody for your advise.
Be careful - the memory could still have been reused. For
example:
assert(a.ok);
destroy(a);
// ... lots of code, maybe multi-threaded ...
assert(!a.ok);// can fail
If between `destroy()` and the second `assert()`, the memory
of the
object is collected, a new object (of the same or different
type) can
have been placed there. You will then read an arbitrary piece
of data
from that new object, which may or may not evaluate to `true`.
In this case the object cannot be collected by gc because there
is still
a good reference to it (variable 'a'). I agree if delete was
used
instead of destroy that is would be unsafe.
--
dano
Right, but I see it only as a simplified example. In a real
program, that reference will most likely be a member of object
whose destructor is being run.
Re: Are there any methods like isDestroyed or isDisposed to detect whether some object is destroyed or not?
"Marc "Schütz\"" writes:
> On Saturday, 13 December 2014 at 21:20:43 UTC, Andrey Derzhavin wrote:
>>>
>>> import std.stdio;
>>>
>>> class ObjectAType {
>>>bool ok;
>>>this() {ok = true;}
>>> }
>>>
>>> void main()
>>> {
>>>auto a = new ObjectAType;
>>>assert(a.ok);
>>>destroy(a);
>>>assert(!a.ok); // a has been destroyed.
>>> }
>>>
>>
>> This method of detection of collected objects is what I needed.
>> Thanks to everybody for your advise.
>
> Be careful - the memory could still have been reused. For example:
>
> assert(a.ok);
> destroy(a);
> // ... lots of code, maybe multi-threaded ...
> assert(!a.ok);// can fail
>
> If between `destroy()` and the second `assert()`, the memory of the
> object is collected, a new object (of the same or different type) can
> have been placed there. You will then read an arbitrary piece of data
> from that new object, which may or may not evaluate to `true`.
In this case the object cannot be collected by gc because there is still
a good reference to it (variable 'a'). I agree if delete was used
instead of destroy that is would be unsafe.
--
dano
Re: SQLLite driver
On Sunday, 14 December 2014 at 13:47:21 UTC, Suliman wrote: On Sunday, 14 December 2014 at 13:33:27 UTC, Suliman wrote: There is also a branch named `develop` which at least compiles, maybe it is usable. how to add to dub this branch? Compiling using dmd... Linking... OPTLINK (R) for Win32 Release 8.00.15 Copyright (C) Digital Mars 1989-2013 All rights reserved. http://www.digitalmars.com/ctg/optlink.html sqlite3.lib Warning 2: File Not Found sqlite3.lib C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_close C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_enable_shared_cache C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_open C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_changes C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_total_changes C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_errcode C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_errmsg C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_open_v2 C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_finalize C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_bind_parameter_count C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_clear_bindings C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_reset C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_step C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_prepare_v2 C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_count C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_type C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_name C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_text C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_double C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_int64 C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_blob C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_bytes --- errorlevel 22 FAIL .dub\build\application-debug-windows-x86-dmd_2066-668EB54A2EBB0CE5C55E2AC62 166BCB8\ seismodownloader executable Error executing command run: dmd failed with exit code 22. Warning 2: File Not Found sqlite3.lib Does it's mean that I should to find this lib and put it in package folder? Yes, you need to link the sqlite3 library, but I'm sorry I can't help you more, because I've never done this with dub on Windows... The develop branch is more up-to-date. It should compile with 2.066.1. And the API is supposed to be cleaner. See the examples to find the changes. -- Nicolas
Re: dub dustmite
No luck, unfortunately.
Re: SQLLite driver
On Sunday, 14 December 2014 at 13:33:27 UTC, Suliman wrote: There is also a branch named `develop` which at least compiles, maybe it is usable. how to add to dub this branch? Compiling using dmd... Linking... OPTLINK (R) for Win32 Release 8.00.15 Copyright (C) Digital Mars 1989-2013 All rights reserved. http://www.digitalmars.com/ctg/optlink.html sqlite3.lib Warning 2: File Not Found sqlite3.lib C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_close C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_enable_shared_cache C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_open C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_changes C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_total_changes C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_errcode C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_errmsg C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_open_v2 C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_finalize C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_bind_parameter_count C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_clear_bindings C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_reset C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_step C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_prepare_v2 C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_count C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_type C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_name C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_text C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_double C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_int64 C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_blob C:\Users\Dima\AppData\Roaming\dub\packages\d2sqlite3-0.5.2\d2sqlite3.lib(d2sqlit e3) Error 42: Symbol Undefined _sqlite3_column_bytes --- errorlevel 22 FAIL .dub\build\application-debug-windows-x86-dmd_2066-668EB54A2EBB0CE5C55E2AC62 166BCB8\ seismodownloader executable Error executing command run: dmd failed with exit code 22. Warning 2: File Not Found sqlite3.lib Does it's mean that I should to find this lib and put it in package folder?
Re: SQLLite driver
There is also a branch named `develop` which at least compiles, maybe it is usable. how to add to dub this branch?
Re: Compact Printing of Tuples
On Sunday, 14 December 2014 at 11:53:21 UTC, Nordlöw wrote:
Why arent' Tuples defaultly printed as
(1, 2)
instead
Tuple!(int, int)(1, 2)
?
What's the most convenient of tweak this behaviour so I get
untyped-printing. Is there a function to convert a Tuple to
into a D parameter tuple?
Tuple.expand?
template Wrapper(Tuple)
{
static if(isTuple!Tuple)
{
struct Wrapper(Tuple)
{
Tuple tup;
alias tup this;
// should use a better overload
string toString()
{
auto app = appender!string();
app.put("(");
app.put(to!string(wrapper(tuple[0])));
foreach(t; tuple.expand[1 .. $])
{
app.put(", ");
app.put(to!string(wrapper(t
}
app.put(")");
return app.data;
}
}
}
else
alias Wrapper = Tuple;
}
auto wrapper(T)(T t) { return Wrapper!T(t); }
Re: All Unordered Pairs of Elements in a Range
On Saturday, 13 December 2014 at 23:08:13 UTC, H. S. Teoh via Digitalmars-d-learn wrote: Sounds like: https://issues.dlang.org/show_bug.cgi?id=6788 T I guess what's missing here is to make it work for ForwardRanges, right?
Compact Printing of Tuples
Why arent' Tuples defaultly printed as (1, 2) instead Tuple!(int, int)(1, 2) ? What's the most convenient of tweak this behaviour so I get untyped-printing. Is there a function to convert a Tuple to into a D parameter tuple?
Re: SQLLite driver
On Sunday, 14 December 2014 at 07:18:46 UTC, Rikki Cattermole wrote: On 14/12/2014 7:35 p.m., Suliman wrote: Yes I used 2.0.65, but after updating compiler the situation did not resolved... http://www.everfall.com/paste/id.php?apd0bfs5z4eg Ah oh, I remember this issue from 2.064 -> 2.065. Definitely hasn't been upgraded. https://github.com/biozic/d2sqlite3/issues/6 There is also a branch named `develop` which at least compiles, maybe it is usable.
Re: Wrapping multiple extern (C) declarations in a template
On Saturday, 13 December 2014 at 19:03:42 UTC, aldanor wrote: If I now want to have exactly the same module but with all function declarations wrapped as described above, I have to public import it in another module and then do some template magic. However, it wouldn't be possible to retain the same function names since they've been imported to the namespace (it's then also not possible to extern them as private initially since then you won't be able to import/wrap them in a different module). Hence the idea of mixing the wrapping template in the initial .d header. You can also use `static import`. That way, the imported symbols will only be accessible via their fully-qualified name (e.g. `mypackage.mybindings.foo` instead of `foo`) and won't pollute the module's namespace.
Re: Are there any methods like isDestroyed or isDisposed to detect whether some object is destroyed or not?
On Saturday, 13 December 2014 at 21:20:43 UTC, Andrey Derzhavin
wrote:
import std.stdio;
class ObjectAType {
bool ok;
this() {ok = true;}
}
void main()
{
auto a = new ObjectAType;
assert(a.ok);
destroy(a);
assert(!a.ok); // a has been destroyed.
}
This method of detection of collected objects is what I needed.
Thanks to everybody for your advise.
Be careful - the memory could still have been reused. For example:
assert(a.ok);
destroy(a);
// ... lots of code, maybe multi-threaded ...
assert(!a.ok);// can fail
If between `destroy()` and the second `assert()`, the memory of
the object is collected, a new object (of the same or different
type) can have been placed there. You will then read an arbitrary
piece of data from that new object, which may or may not evaluate
to `true`.
The only case where this can be safe is when you can guarantee
that there are no new memory allocations between the destruction
and the test, or that the GC doesn't run. The first condition may
also be no longer sufficient if the GC starts moving objects
around (the current one doesn't).
Really, in practice you just cannot safely access GC managed
resources from inside a GC destructor. You're just asking for
trouble if you try to hack around that fact.
Re: How to share modules when using -shared?
On Wednesday, 10 December 2014 at 00:44:41 UTC, Justin Whear wrote: I'm trying to build components that I can dynamically link and keep running into an issue with sharing modules between the host and the pluggable components. Assuming a layout like this: host.d -- loads components at runtime a.d -- a module that builds to `a.so` b.d -- a module that builds to `b.so` common.d If a.d and b.d both import common.d, all is well. If host.d imports common.d as well, I get this at runtime: Fatal Error while loading 'a.so': The module 'common' is already defined in 'host'. Test session with sources here: http://pastebin.com/LxsqHhJm Some of this can be worked around by having host.d use its own extern definitions, but how does this work with interfaces? My tests thus far have resulted in object invariant failures. You can have common in separate .so file, or include it in host.
Re: dub dustmite
On Friday, 12 December 2014 at 04:25:01 UTC, Vlad Levenfeld wrote: I'm trying to reduce a bug with dub dustmite feature and I must be doing it wrong somehow, my regular dub output looks like this: source/experimental.d(2403): Error: struct experimental.Product!(int[], int[]).Product no size yet for forward reference ulong[2] source/experimental.d(2454): Error: template instance experimental.Product!(int[], int[]) error instantiating source/experimental.d(2462):instantiated from here: by!(int[], int[]) FAIL .dub/build/application-debug-linux.posix-x86_64-dmd_2067-44246AA2375AB6C7D895600135F734E4/ engine_vx executable Error executing command run: dmd failed with exit code 1. and then when I run this command dub dustmite ~/dubdust --compiler-regex="Product no size yet" I get Executing dustmite... None => No object.Exception@dustmite.d(243): Initial test fails It seems like a pretty simple case, I'm not sure what's going on. Try using --combined. This will test all packages at the same time if you have dependencies.
Re: std.array oddness
On Sun, 14 Dec 2014 05:15:43 +
earthfront via Digitalmars-d-learn
wrote:
> On Saturday, 13 December 2014 at 06:40:41 UTC, ketmar via
> Digitalmars-d-learn wrote:
> > auto names = File("names.txt")
> > .byLine!(char,char)(KeepTerminator.no, ',')
> > .map!"a.idup"
> > .array;
>
> Awesome. "map!idup" does the trick.
>
> I had looked at the "byLine" doc before posting, in particular,
> this line:
> "Note:
> Each front will not persist after popFront is called, so the
> caller must copy its contents (e.g. by calling to!string) if
> retention is needed."
>
> This explains the behavior though I didn't get it then. It's
> talking about the "range" methods.
> Following the component based stuff from Walter's article can be
> brain-bendy. And in this case, requires careful reading of the
> docs.
> But I like it.
it's a matter of time to become used with that "ranges" stuff. but then
you will start seeing ranges everywhere. ;-)
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