unordered_map insert vs emplace - Woodsb




TheDrainedsoul 15 Oct 2018 shared via Twitter
Why would that be the obvious behavior? Other member functions of unordered_map don't behave that way: insert doesn't insert if an equivalent key exists. Why would emplace return a pair with a bool indicating whether it inserted or not if it always inserted?


CPlusPlusGuru_ 18 Oct 2014 shared via Twitter
What is the difference between unordered_map :: emplace and unordered_map :: insert in C++?: What is the diffe...


kweenys 15 Feb 2018 shared via Twitter
Learned the hard ward: std::unordered_map::emplace does not update if the key is already in the map, but std::unorderd_map::insert_or_assign (c++17 or newer) does.


SubaruG 3 Dec 2013 shared via Twitter
std::[unordered_]map における挿入は insert より emplace の方が圧倒的に便利だな


tgockel 7 May 2013 shared via Twitter
C++ performance: GCC unordered_map's emplace implementation is significantly slower than insert when repeating keys.


Flast_RO 30 Dec 2011
Boost.Containerのmap.emplaceとflat_map.emplaceunorderedとかstdlibのmapとかと違ってiteratorしか返さないからinsertできたかどうかが判定できない...


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