• zoli (23/23) Oct 21 2009 Can the compiler optimize the delegates (foo) to form an inline code, or...
• bearophile (5/6) Oct 21 2009 Today D compilers are in general not smart enough yet (like the Scala co...
• zoli (4/9) Oct 21 2009 Thank you. Could you provide a sample or a link ?
• bearophile (15/18) Oct 21 2009 Silly D2 code:

zoli <zoli freemail.hu> writes:

Can the compiler optimize the delegates (foo) to form an inline code, or the
mixin version is prefered?

module a;

import std.stdio;

void foo2( string s )()
{

	for( int i = 0 ; i < 10; i++ )
	{
		mixin( s );
	}		
}

void foo( void delegate(int) pDg )
{
	for( int i = 0 ; i < 10; i++ )
	{
		pDg( i );
	}		
} 

void main()
{
	foo( (int a){ writeln( a ); } );
	foo2!("writeln( i );")();
}

Thank you 1

bearophile <bearophileHUGS lycos.com> writes:

zoli:
 Can the compiler optimize the delegates (foo) to form an inline code, or the
mixin version is prefered?<

Today D compilers are in general not smart enough yet (like the Scala compiler,
for example) to inline delegates. But there's an alternative to string mixins,
in D2 you can pass a templated function, even one where you omit the type of
the arguments :-)
There's no shortage of tricks in D2.

Bye,
bearophile

zoli <galap freemail.hu> writes:

bearophile Wrote:

 zoli:
 Can the compiler optimize the delegates (foo) to form an inline code, or the
mixin version is prefered?<

 
 Today D compilers are in general not smart enough yet (like the Scala
compiler, for example) to inline delegates. But there's an alternative to
string mixins, in D2 you can pass a templated function, even one where you omit
the type of the arguments :-)
 There's no shortage of tricks in D2.

Thank you. Could you provide a sample or a link ? 
Sorry, i know it's a d.learn topic..., 
Offtopic: Is it possible to alter the web interface of the news to change
newsgroups during composition ? 

bearophile <bearophileHUGS lycos.com> writes:

zoli:

 Thank you. Could you provide a sample or a link ?

Silly D2 code: 

import std.stdio: writeln;

void table(alias Mapper, T)(T[] arr) {
    foreach (el; arr)
        writeln(Mapper(el));
}

void main() {
    table!((x){ return x * x;})([2, 3, 4]);
}

I don't like that code a lot, I'd like the D compiler to be smarter, so the
programmer can avoid such silly tricks, and the programmer can program in a
more functional style (where you use *functions*).


 Sorry, i know it's a d.learn topic..., 

Yep. Better to ask such things there.


 Offtopic: Is it possible to alter the web interface of the news to change
newsgroups during composition ?<

I don't know. Probably not.

Bye,
bearophile