c++ Programming Glossary: rvo

Is returning by rvalue reference more efficient?

http://stackoverflow.com/questions/1116641/is-returning-by-rvalue-reference-more-efficient

compiler can it will avoid the move altogether by using RVO return value optimization . Now you can do the following Beta_ab.. And it will move construct the temporary into ab or do RVO to omit doing a move or copy altogether. I recommend you to.. Rvalue References 101 which explains the matter and how N RVO happens to interact with this. Your case of returning an rvalue..

Is it possible to std::move objects out of functions? (C++11)

http://stackoverflow.com/questions/13618506/is-it-possible-to-stdmove-objects-out-of-functions-c11

This is the so called named return value optimization N RVO which was specified even before C 11 and is supported by most..

Understanding return value optimization and returning temporaries - C++

http://stackoverflow.com/questions/1394229/understanding-return-value-optimization-and-returning-temporaries-c

string get_a_string2 std string str hello return str Will RVO be applied in all the three cases Is it OK to return a temporary.. share improve this question In two first cases RVO optimization will take place. RVO is old feature and most compilers.. In two first cases RVO optimization will take place. RVO is old feature and most compilers supports it. The last case..

Why copy constructor is not called in this case?

http://stackoverflow.com/questions/1758142/why-copy-constructor-is-not-called-in-this-case

share improve this question This is so called RVO . To experiment a little try to comment out copy constructor...

Returning object from function

http://stackoverflow.com/questions/2616107/returning-object-from-function

copies of temporaries can be omitted by the compiler as of RVO rule . There is unfortunately no guarantee but modern compilers.. no guarantee but modern compilers do implement RVO. Rvalue references in C 0x allows Foo to implement a resource.. a compiler that implements rvalue references but not RVO. However there are scenarios where RVO can't kick in. A question..

In C++, is it still bad practice to return a vector from a function?

http://stackoverflow.com/questions/3134831/in-c-is-it-still-bad-practice-to-return-a-vector-from-a-function

using the move constructor of std vector assuming N RVO doesn't take place. Even prior to C 0x the first form would.. C 0x the first form would often be efficient because of N RVO. However N RVO is at the discretion of the compiler. Now that.. form would often be efficient because of N RVO. However N RVO is at the discretion of the compiler. Now that we have rvalue..

push_back vs emplace_back

http://stackoverflow.com/questions/4303513/push-back-vs-emplace-back

all. That's useful Because no matter how much cleverness RVO and move semantic bring to the table there is still complicated..

C++ Returning reference to local variable

http://stackoverflow.com/questions/4643713/c-returning-reference-to-local-variable

main no copy is actually made if your compiler supports RVO big_object o func4 Interestingly binding a temporary to a const..

C++11 rvalues and move semantics confusion

http://stackoverflow.com/questions/4986673/c11-rvalues-and-move-semantics-confusion

copy no move or if the compiler decides it can not perform RVO then it will use vector's move constructor to do the return... use vector's move constructor to do the return. Only if RVO is not performed and if the returned type did not have a move..

c++11 Return value optimization or move?

http://stackoverflow.com/questions/17473753/c11-return-value-optimization-or-move

Which should I use c c 11 move return value optimization rvo share improve this question All return values are already..

Will C++ compiler optimize return-by-value code?

http://stackoverflow.com/questions/18594241/will-c-compiler-optimize-return-by-value-code

int a int b return S a b a b USAGE S my_result func 5 6 c rvo share improve this question Modern compilers will often..

Conditions for copy elision?

http://stackoverflow.com/questions/6383639/conditions-for-copy-elision

Foo inFoo int main std cout nTest RVO std endl Foo rvo TestRVO std cout nTest named RVO std endl Foo named_rvo TestNamedRVO.. rvo TestRVO std cout nTest named RVO std endl Foo named_rvo TestNamedRVO std cout nTest PassByValue std endl Foo foo 512..

C++ Unified Assignment Operator move-semantics

http://stackoverflow.com/questions/7458110/c-unified-assignment-operator-move-semantics

just not ready yet Thanks c c 11 perfect forwarding rvo share improve this question Be very leery of the copy swap..

Why g++ does not enable RVO here?

http://stackoverflow.com/questions/9293726/why-g-does-not-enable-rvo-here

main const Klass result create Klass Compiling with g O3 rvo.cpp o rvo The output is . rvo Klass create Klass a Klass const.. Klass result create Klass Compiling with g O3 rvo.cpp o rvo The output is . rvo Klass create Klass a Klass const Klass right.. Klass Compiling with g O3 rvo.cpp o rvo The output is . rvo Klass create Klass a Klass const Klass right I was expecting..