Hi!

I've never used delegates before etc. not really familiar with it.
I was trying something like this:

import std.stdio;
import std.regex;

bool lol(string name, string val)
{
    if (name == "lal")
        if (val[0..3] == "2124")
            return true;
    return false;
}

bool lal(string name, string val) { return false; }

void main()
{
    struct Filter
    {
        private bool delegate(string, string)[] delFuncs; // array with functions :D

        public void add(bool delegate(string, string) filter_func) {
            delFuncs ~= filter_func;
        }
    }

    auto x = Filter();
    x.add(&lol);
    x.add(&lal);

    writeln(x);
}

How can I make this work? Thank you :)

On Fri, Nov 30, 2012 at 04:41:40PM +0100, Chopin wrote:
> Hi!
> 
> I've never used delegates before etc. not really familiar with it.
[...]

You could try something like this:

	alias bool delegate(string, string) DgType;
	DgType[] arrayOfDelegates;


T

-- 
Why waste time learning, when ignorance is instantaneous? -- Hobbes, from Calvin & Hobbes

I tried the following:

import std.stdio;
import std.regex;

bool lol(string name, string val)
{
    if (name == "lal")
        if (val[0..3] == "2124")
            return true;
    return false;
}

bool lal(string name, string val) { return false; }
alias bool delegate(string, string) DgType;
void main()
{
    struct Filter
    {

        private DgType[] delFuncs; // array with functions :D


        public void add(DgType filter_func) {
            delFuncs ~= filter_func;
        }
    }

    auto x = Filter();
    x.add(&lol);
    x.add(&lal);

    writeln(x);
}

Didn't work... just a bunch of errors...

t.d(28): Error: function t.main.Filter.add (bool delegate(string, string) filter_func) is not callable using argument types (bool function(string name, string v
al))
t.d(28): Error: cannot implicitly convert expression (& lol) of type bool function(string name, string val) to bool delegate(string, string)
t.d(29): Error: function t.main.Filter.add (bool delegate(string, string) filter_func) is not callable using argument types (bool function(string name, string v
al))
t.d(29): Error: cannot implicitly convert expression (& lal) of type bool function(string name, string val) to bool delegate(string, string)

Thanks for help!

On Fri, Nov 30, 2012 at 04:57:44PM +0100, Chopin wrote:
> I tried the following:
> 
> import std.stdio;
> import std.regex;
> 
> bool lol(string name, string val)
> {
>     if (name == "lal")
>         if (val[0..3] == "2124")
>             return true;
>     return false;
> }
> 
> bool lal(string name, string val) { return false; }
> alias bool delegate(string, string) DgType;
> void main()
> {
>     struct Filter
>     {
> 
>         private DgType[] delFuncs; // array with functions :D
> 
> 
>         public void add(DgType filter_func) {
>             delFuncs ~= filter_func;
>         }
>     }
> 
>     auto x = Filter();
>     x.add(&lol);
>     x.add(&lal);
> 
>     writeln(x);
> }
> 
> Didn't work... just a bunch of errors...
> 
> t.d(28): Error: function t.main.Filter.add (bool delegate(string,
> string) filter_func) is not callable using argument types (bool
> function(string name, string v
> al))
[...]

Ah, I see the problem. What you want are *function pointers*, not delegates. So do this instead:

	alias bool function(string,string) FuncType;
	struct Filter
	{
		private FuncType[] delFuncs;
		...
	}


T

-- 
Prosperity breeds contempt, and poverty breeds consent. -- Suck.com

Amazing! It works! Thank you so much :)