[Issue 3514] opApply should be the first-choice foreach iteration method.

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3514



--- Comment #1 from David Simcha <dsimcha at yahoo.com> 2009-11-16 06:21:38 PST ---
Forgot to mention:  Also, when using virtual functions, it may sometimes be
reasonable to define an opApply as an optimization for foreach loops, even if
the range-based foreach has the exact same semantics.  For example:

class Foo {
    SomeType front() {  return _front;}
    void popFront() {  
        // do stuff.
    }

    bool empty() {
        return _empty;
    }
}

In this case each iteration will require three virtual function calls, whereas
if opApply were used, the overhead would be reduced to a single delegate call.

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