Re: D serialization temporary fixup?
On Thursday, 22 October 2015 at 16:15:23 UTC, Shriramana Sharma wrote: I wanted a D equivalent to: http://doc.qt.io/qt-5/qdatastream.html https://docs.python.org/3/library/pickle.html and saw that one is under construction: http://wiki.dlang.org/Review/std.serialization But till it's finalized, I'd just like to have a quick but reliable way to store real and int data types into a binary data file and read therefrom. Is there such a solution? The size of the data is fixed, but especially since I have real values, I'd like to not write to limited fixed decimal text format. https://github.com/atilaneves/cerealed Atila
Re: error detected at """ ch in unicode.C """ Library error?
My opinion is to use the Tango's unicodedata.d module to obtain the unicode category, std.uni does not provide such functionality. This module does not have any dependency, therefore you can just use it directly: https://github.com/SiegeLord/Tango-D2/blob/d2port/tango/text/UnicodeData.d#L169
Mixin template parameter that is an undefined variable
[code]
mixin template Test(alias a){
int a;
}
void main(){
mixin Test!blah;
}
[/code]
Compiler says it doesn't know about "blah". My purpose is to
define the parameter as a variable. Is that possible?
Re: Mixin template parameter that is an undefined variable
On Friday, 23 October 2015 at 12:22:49 UTC, tcak wrote:
[code]
mixin template Test(alias a){
int a;
}
void main(){
mixin Test!blah;
}
[/code]
Compiler says it doesn't know about "blah". My purpose is to
define the parameter as a variable. Is that possible?
you would have to use a string.
mixin template Test(string a)
{
mixin(`int ` ~ a ~ `;`);
}
void main()
{
mixin Test!"blah";
mixin Test!q{blah2};
}
Default method implementations in interfaces?
Is it possible to have default method implementations in interfaces à la Java in D? Or some equivalent that allows multiple inheritance without a bunch of identical copypasted method bodies?
Re: Default method implementations in interfaces?
On Friday, 23 October 2015 at 14:58:43 UTC, pineapple wrote:
Is it possible to have default method implementations in
interfaces à la Java in D? Or some equivalent that allows
multiple inheritance without a bunch of identical copypasted
method bodies?
Use template mixins: http://dlang.org/template-mixin.html
interface MyInterface {
void foo();
int bar();
}
mixin template MyInterfaceDefaultImpl() {
void foo() {
// put code here
}
int bar() {
// put code here
}
}
class MyClass : MyInterface {
mixin MyInterfaceDefaultImpl!(); // Similar to inserting the
body of `MyInterfaceDefaultImpl` at this point.
mixin MyOtherInterfaceDefaultImpl!(); // Can put any amount
of them here.
}
Re: Default method implementations in interfaces?
On Friday, 23 October 2015 at 14:58:43 UTC, pineapple wrote: Is it possible to have default method implementations in interfaces à la Java in D? Or some equivalent that allows multiple inheritance without a bunch of identical copypasted method bodies? Use a mixin template together with your interface. Here's an example from my book: http://arsdnet.net/dcode/book/chapter_06/09/multiple_inheritance.d https://www.packtpub.com/application-development/d-cookbook Notice that there's default implementations for each interface, you mix them in to get it all and can override individual names in the class too.
Invalid assembler comparison
Hello, I've been trying to understand this for a while now: https://github.com/etcimon/botan/blob/master/source/botan/math/mp/mp_core.d#L765 This comparison (looking at it with windbg during cmp operation) has these invalid values in the respective registers: rdx: 9366584610601550696 r15: 8407293697099479287 When moving them into a ulong variable with a mov [R11], RDX before the CMP command, I get: RDX: 7549031027420429441 R15: 17850297365717953652 Which are the valid values. Any idea how these values could have gotten corrupted this way? Is there a signed integer conversion going on behind the scenes?
Re: Invalid assembler comparison
On Friday, 23 October 2015 at 15:17:43 UTC, Etienne Cimon wrote: Hello, I've been trying to understand this for a while now: https://github.com/etcimon/botan/blob/master/source/botan/math/mp/mp_core.d#L765 This comparison (looking at it with windbg during cmp operation) has these invalid values in the respective registers: rdx: 9366584610601550696 r15: 8407293697099479287 When moving them into a ulong variable with a mov [R11], RDX before the CMP command, I get: RDX: 7549031027420429441 R15: 17850297365717953652 Which are the valid values. Any idea how these values could have gotten corrupted this way? Is there a signed integer conversion going on behind the scenes? I found out that there was an integer conversion going on behind the scenes when using jnl. I had to use jnb http://stackoverflow.com/questions/27284895/how-to-compare-a-signed-value-and-an-unsigned-value-in-x86-assembly
Re: Default method implementations in interfaces?
On Friday, 23 October 2015 at 15:07:05 UTC, Alex Parrill wrote: Use template mixins: http://dlang.org/template-mixin.html On Friday, 23 October 2015 at 15:08:30 UTC, Adam D. Ruppe wrote: Use a mixin template together with your interface. Awesome, thanks! No way, though, to unite declaration and implementation? Feels a little too much like endless header files to me.
Re: Default method implementations in interfaces?
On 10/23/15 10:58 AM, pineapple wrote: Is it possible to have default method implementations in interfaces à la Java in D? Or some equivalent that allows multiple inheritance without a bunch of identical copypasted method bodies? If the idea is to have an implementation that *doesn't* get overridden, you can have final methods in an interface. I know it's not what you asked for, but sometimes people may ask for something they know not realizing that something else may satisfy their needs :) -Steve
Re: D serialization temporary fixup?
Shriramana Sharma wrote: > I'd just like to have a quick but reliable way to > store real and int data types into a binary data file and read therefrom. > Is there such a solution? Wow thank you people! Nice to know I can do rawWrite and also have other options. BTW is there a reason that either msgpack or cerealed are not made part of Phobos but developed separately? -- Shriramana Sharma, Penguin #395953
OT: The Genius Famine
Since there are some highly creative and intelligent people here, self-selected to be those who enjoy working on problems that are intrinsically interesting, I thought one or two people might enjoy reading some extracts from a forthcoming book on the topic of creative accomplishment and the endogenous personality by Professor Bruce Charlton, Professor of Medicine at Newcastle University. If it's not your bag, then no need to read it! http://geniusfamine.blogspot.co.uk/ This book is about genius: what it is, what it does, where it comes from.[1] And about geniuses: especially why there used to be so many and now there are so few; what was the effect of an era of geniuses, and what will be the consequences of our current Genius Famine. This book describes the genius as an Endogenous personality; that is, a person of high intelligence combined with a personality driven from within, an ‘inner’ –orientated personality: that is, a dominated by the Creative Triad of (1) Innate high ability, (2) Inner motivation and (3) Intuitive thinking. When high intelligence and this type of personality are confluent, a potential genius is the result. But to fulfil this potential the Endogenous personality must find and accept his own Destiny, and must undergo the trials and tribulations of a Quest before he is likely to be rewarded by an Illumination: a breakthrough. Even then, the breakthrough must be noticed, understood, accepted, implemented by society at large; and we describe how past societies were much better at recognizing and making a place for the potential genius. Because the problem is that the Endogenous personality is usually an awkward and asocial character at best; and often an actively unpleasant person and a disruptive influence. Geniuses are altruistic, in the sense that their work is primarily for the good of the group; and not for the usual social rewards such as status, money, sex, and popularity. Therefore many geniuses need to be sustained in a long-term way; and their work demands careful attention and evaluation. We argue that modern societies, by means both indirect and direct, have become hostile to genius and indifferent to the work of those relatively few remaining geniuses. However, because the work of a genius is necessary and irreplaceable, we argue for a change of attitude. Modern society needs geniuses for its own survival in the face of unfamiliar, often unprecedented, threats. Therefore, we must in future do a better job of recognizing, sustaining and accepting guidance from as many geniuses of the highest quality that can be found.
Re: Overloading an imported function
On Wednesday, 21 October 2015 at 12:05:27 UTC, Shriramana Sharma
wrote:
import std.math;
real round(real val, int prec)
{
real pow = 10 ^^ prec;
return round(val * pow) / pow;
}
Trying to compile this I get:
foo.d(5): Error: function foo.round (real val, int prec) is not
callable using argument types (real)
When I've imported std.math which contains round(real), why is
the compiler complaining about not being able to call the
overload function defined in *this* module?
I don't see anything in http://dlang.org/module.html that says
I cannot define an overload of an imported function. Did I miss
something?
My guess is that .round shadows math.round. But you can
get desired behavior
by moving declaration of math.round inside scope of
.round. This compiles:
real round(real val, int prec)
{
import std.math;
real pow = 10 ^^ prec;
return round(val * pow) / pow;
}
Re: error detected at """ ch in unicode.C """ Library error?
On 10/23/2015 04:33 AM, rumbu via Digitalmars-d-learn wrote: My opinion is to use the Tango's unicodedata.d module to obtain the unicode category, std.uni does not provide such functionality. This module does not have any dependency, therefore you can just use it directly: https://github.com/SiegeLord/Tango-D2/blob/d2port/tango/text/UnicodeData.d#L169 Thank you for confirming that std.uni doesn't implement that functionality, and for pointing to a Tango source. That's probably the one I was originally remembering, but is Tango even still being maintained? (OK, this very module was last updated 3 days ago.) FWIW, in the past I've had a lot of trouble syncing Tango and D, to the point that I just dropped Tango, but as you say, this module doesn't seem to have any external dependencies, and it would be a faster solution to the problem, and perhaps it would work on the various control chars. Still, I don't use this for heavy processing, so maintaining this external dependency would likely be more effort than it is worth...as long as I don't need to handle exotic chars in the control range. If speed were my main consideration, I'd certainly give that solution a try. The benefit of the solution that I proposed is that it's easy to understand given the phobos library. And if I actually needed to handle exotic control chars, then it would be the only option I've seen. However the text I'm handling is *almost* all ASCII, so ... (occasional German, occasional footnotes in Greek, and occasional and usually isolated single ideograms in Chinese or some Japanese script, etc. I don't think I've run across any Sanskrit yet. etc.) As such the solution I proposed is probably good enough, though if there were a Phobos level solution I'd prefer that.
