Unexpected performance results

Discussion in 'C++' started by Dave, Apr 8, 2004.

  1. Dave

    Dave Guest

    Hello all,

    Can anybody think of a plausible explanation for why my profiler is telling
    me that I get better performance with map::eek:perator[] than with

    Dave, Apr 8, 2004
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  2. Dave

    Leor Zolman Guest

    This would be totally a QOI issue, but I did take a look just for grins in
    an implementation or two, and I noticed that, even though operator[] tends
    to call insert() to do its work, insert() returns a pair<...> by value
    while operator[] just returns a ref to an element. Perhaps the construction
    of that return value from insert() might be your culprit...
    Leor Zolman, Apr 8, 2004
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