[Issue 6207] Mixin template evaluated to string can convert to string mixin expression implicitly

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6207



--- Comment #1 from Kenji Hara <k.hara.pg at gmail.com> 2011-10-16 18:58:34 PDT ---
We can improve the string lambda features in std.algorithm!

mixin template map(string pred)
{
    enum map = `map!((a){ return `~pred~`; })`;
}
template map(alias pred)
{
    auto map(E)(E[] r)
    {
        E[] result;
        foreach (e; r)
            result ~= pred(e);
        return result;
    }
}

void main()
{
    int b = 10;
    auto r = map!q{ a * b }([1,2,3]);
    //   --> mixin(`map!((a){ return ` ~ q{ a * b } ~ `; })`)([1,2,3])
    //   --> map!((a){ return  a * b ; })([1,2,3]);
    assert(r == [10,20,30]);
}

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