cpp-cheat/cpp/move.cpp at 15a6977f87113636042474d6a7fe5c20af38a271 · rontrek/cpp-cheat

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/* # move constructor

* ## move semantics

* Useful in situations where a class heap allocated data.

* Made possible by C++11 rvalue references.

* Basic idea: when copying from an rvalue, it is not necessary to make an expensive copy of it:

* it suffices to acquire its data via swap, and leave it on a valid state (via a default constructor for example).

* This is true because the rvalue passed to a copy constructor cannot be seen.

* Value reference allows to overload the copy constructor based not on type,

* but on the fact that a value is an rvalue or an lvalue!

* No change must be done to the copy and swap idiom for move semantics to work for the assignment operator,

* since in C++11 `int i = rvale` calls a move consttuctor on `i` while `int i = lvalue` calls a copy constructor.

* ## Bibliography

* - http://stackoverflow.com/questions/3106110/what-is-move-semantics

* - http://stackoverflow.com/questions/3413470/what-is-stdmove-and-when-should-it-be-used

#include "common.hpp"

int main() {

#if __cplusplus >= 201103L

// TODO example

#endif

}