DPaste - Paste #2874 - pastebin, online compiler and collaboration tool dedicated to D Programming Language

Code

import std.stdio;
import std.string;
import std.traits;
import std.typetuple;

mixin template Delay(alias Call, Args...)
{
    ReturnType!Call Delay() { return Call(Args[0]); };
}

@property string getMapperMixin(size_t count)()
{
    string result;
    string[] mixinDecls;
    string[] tupleList;
    
    foreach (idx; 0 .. count)
    {
        mixinDecls ~= xformat("mixin .Delay!(Call, Args[%s]) Del%s;", idx, idx);
        tupleList ~= xformat("Del%s.Delay", idx);
    }
    
    string tupleStr = "alias TypeTuple!(";
    tupleStr ~= tupleList.join(",");
    tupleStr ~= ") Map;";
    
    string mixinStr = mixinDecls.join("\n");
    
    result = mixinStr ~ "\n" ~ tupleStr;
    
    return result;
}

template Map(alias Call, Args...) 
{
    /** 
        Expands to (when length is 2):
        
        mixin .Delay!(Call, Args[0]) Del1;
        mixin .Delay!(Call, Args[1]) Del2;
        
        alias TypeTuple!(
            Del1.Delay,
            Del2.Delay
        ) Map;
    */
    mixin(getMapperMixin!(Args.length));
}

int functor(int arg)
{
    return arg * 10;
}

void initCall(Args...)(Args args)
{
    print( Map!(functor, args) );
}

void print(T...)(T args)
{
    foreach (arg; args)
        writef("%s ", arg);
    writeln();
}

void main()
{
    int x = 1;
    int y = 2;
    initCall(x, y);
}

Application output:

10 20

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Author: Guest

Views: 157

Private: no

Expires: Never

Uploaded: 17.10.12 5:55

Votes: 0

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Compiler: DMD 2.060

Pointer size: m32

Code

Application output:

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