[Issue 4264] Support opApply in std.algorithm, std.range where possible

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4264



--- Comment #11 from bearophile_hugs at eml.cc 2012-08-28 15:33:46 PDT ---
This code:

import std.stdio: writeln;
struct Iter2 {
    int stop, current;
    @property int front() { return current; }
    @property bool empty() { return current == stop; }
    void popFront() { current++; }
}
void main() {
    writeln(Iter2(10));
}


Shows that writeln supports the range protocol:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]


While this code:

import std.stdio: writeln;
struct Iter {
    int stop;
    int opApply(int delegate(ref int) dg) {
        int result;
        for (int i = 0; i < stop; i++) {
            result = dg(i);
            if (result) break;
        }
        return result;
    }
}
void main() {
    writeln(Iter(10));
}


Outputs this, showing writeln doesn't support opApply iterables:
Iter(10)

I'd like writeln() to show the items here too.

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