What is multimap::emplace() and move()?

Emplacing is easier to understand with vectors my_vector. Emplace_back(1, 2, 3) is basically an efficient shortcut for my_vector. Push_back(some_type(1, 2, 3)) Instead of copy-constructing the object in-place any constructor can now be used for in-place-construction, thus saving the creation, copy (or move) and destruction of a temporary object.

Emplacing is powered by perfect forwarding.

Emplacing is easier to understand with vectors. My_vector. Emplace_back(1, 2, 3) is basically an efficient shortcut for my_vector.

Push_back(some_type(1, 2, 3)). Instead of copy-constructing the object in-place, any constructor can now be used for in-place-construction, thus saving the creation, copy (or move) and destruction of a temporary object. Emplacing is powered by perfect forwarding.

Std::move(expression) is basically a cast to an xvalue, which effectively allows the entire expression to be bound to an rvalue reference. You typically do this to enable resource pilfering from named objects that you are no longer interested in because they are going to be destroyed soon, anyway.

I belive, that instead my_vector. Emplace(1, 2, 3) should be my_vector. Emplace_back(1, 2, 3) – Ashot Martirosyan Mar 29 '11 at 12:30 4 This is a better answer than the accepted answer, which at the very least is inaccurate and arguably wrong.

– Howard nnant Mar 29 '11 at 13:49 @Ashot: Thanks! – FredOverflow Mar 29 '11 at 16:40 So isn't there a typo in msdn doc? I would think that a more explicit example to explain emplace would be m1.

Emplace(1, "a"), i.e. Emplace forwards the arguments. It seems to me that their example would compile as well with insert instead of emplace.

– rafak Mar 29 '11 at 14:58.

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