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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++ - Conditions for copy elision? - Stack Overflow However, copy elision is not performed for the assignment operator and when calling PassByValue Is copy elision not allowed on user defined copy-constructors? (I know that RVO is explicitly allowed by the standard but I don't know about copy elision when passing by value ) Is there a way to verify copy elision without defining copy constructors?
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 If operator = had been declared and defined like this:
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
Does guaranteed copy elision work with function parameters? No elision occurs, no copy constructor or move constructor is called, just () Stuff then happens inside myfunc myfunc returns a prvalue of type Foo This prvalue (aka construction instructions) is used to construct the local variable auto foo So what happens here is that a Foo is constructed via (), then moved into auto foo
c++ Moving a temporary object prevents copy elision (fix available . . . Moving a temporary object prevents copy elision (fix available)clang(-Wpessimizing-move) I am using clang-14 and vscode, vscode's quick fix let me delete std::move, but why? As far as i know, unique_ptr can't be passed as a parameter directly
c++ - Copy constructor elision? - Stack Overflow Yes this is copy elision through Named Return Value Optimization The C++ standard allows an implementation to omit a copy operation resulting from a return statement, even if the copy constructor has side effects Reference: C++03 Standard: 12 8 Copying class objects: # 15
Copy elision when creating object inside emplace() Copy elision is a set of rules that allows a copy(or move) constructor to be avoided, and a copy elided, even if the constructor and corresponding destructor have side-effects It applies in only specific circumstances And passing arguments by reference is not one of those