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Why doesn maps operator< use the maps comparison function?

April 26, 2017comparison function map

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Posted

Why doesn maps operator< use the maps comparison function?

2 Answers

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A map has a notion of comparison, since one of its template parameters is a comparison function. However, operator< for maps uses the elements' operator< rather than that comparison function. This appears odd, but it is deliberate and we believe that it is correct. At the most trivial level, this isn't a bug in our implementation because it's what's mandated by the C++ standard. (The behavior of operator< is described in Table 65, in section 23.1.

0

Posted

A map has a notion of comparison, since one of its template parameters is a comparison function. However, operator< for maps uses the elements' operator< rather than that comparison function. This appears odd, but it is deliberate and we believe that it is correct. At the most trivial level, this isn't a bug in our implementation because it's what's mandated by the C++ standard.