What are copy elision and return value optimization? Copy elision is an optimization implemented by most compilers to prevent extra (potentially expensive) copies in certain situations It makes returning by value or pass-by-value feasible in practice (restrictions apply)
c++ - std::move versus copy elision - Stack Overflow The hint is still correct though, since std::move on a temporary either doesn't have any effect at all (as here) or prevents elision if used in a context where copy elision would otherwise be allowed mandatory, for example if this was the initializer of m_thread instead of an assignment to it
c++ - Conditions for copy elision? - Stack Overflow Cooy elision is generally allowed for all temporary objects, but not for named or bound-to-reference objects It seems that gcc performs precisely the allowed ones
c++ - copy elision of temporary object - Stack Overflow CPP Refs states: — when a temporary class object that has not been bound to a reference (12 2) would be copied moved to a class object with the same cv-unqualified type, the copy move operation
copy elision in c++03 - Stack Overflow Copy-elision is, in some cases, mandatory in c++17, and permitted in c++11 14 This in particular concerns copy initialization For example, the following program #include <iostream> struct
What is copy elision and how does it optimize the copy-and-swap idiom? If copy elision were not allowed, that line would require 3 invocations of the copy constructor and an associated call to a destructor With copy elision being allowed, it can be reduced to 1 call of the copy constructor, the explicit one inside of BigCount::next() where newcounter is declared
c++ - How does guaranteed copy elision work? - Stack Overflow Copy elision was permitted to happen under a number of circumstances However, even if it was permitted, the code still had to be able to work as if the copy were not elided Namely, there had to be an accessible copy and or move constructor Guaranteed copy elision redefines a number of C++ concepts, such that certain circumstances where copies moves could be elided don't actually provoke a