Re: How to provide this arg or functor for algorithm?

[thedeemon via Digitalmars-d-learn]

On Monday, 17 August 2015 at 12:38:05 UTC, anonymous wrote:
auto func()(uint[] arr, uint delegate(uint) pure @nogc d) @nogc
{
    return arr.map!(d);
}
void main() @nogc
{
    uint[3] arr = [1,2,3];
    uint context = 2;
    auto c = Caller(context);
    auto d = &c.method;

    auto r = func(arr[], d);

    import std.algorithm: equal;
    import std.range: only;
    assert(equal(r, only(2, 4, 6)));
}

I've just checked with my runtime GC hook. Here the call to 
func() allocates 12 bytes via gc_malloc, and it's the same for a 
4-elements array, so it's not for the array itself, it's for a 
closure, I think.