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What are copy elision and return value optimization?
Oct 18, 2012 · 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 …
What is copy elision and how does it optimize the copy-and-swap …
Jan 27, 2010 · 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 …
How to enforce copy elision in C++20? - Stack Overflow
Sep 4, 2023 · "Guaranteed copy elision" happens when initializing an object (including in a return statement) with a prvalue of the same class type (ignoring cv-qualification). By definition, a …
c++ - std::move versus copy elision - Stack Overflow
Jan 18, 2022 · 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 …
c++ - How does guaranteed copy elision work? - Stack Overflow
Jun 2, 2017 · One thing guaranteed elision permits you to do is return objects which are immobile. For example, lock_guard cannot be copied or moved, so you couldn't have a function that …
How to check for C++ copy ellision - Stack Overflow
Apr 5, 2010 · Note that copy elision doesn't help with assignment, so the following will always result in a call to operator= if that operator prints anything: Foo f(1); f = getFoo(); Returning by …
Why does std::move prevent RVO (return value optimization)?
The cases where copy and move elision is allowed is found in section 12.8 §31 of the Standard (version N3690): When certain criteria are met, an implementation is allowed to omit the …
Why can the lifetimes not be elided in a struct definition?
The rules for lifetime elision for functions have a pretty small scope and were empirically found in RFC 141 to have a high success rate (87%). This was a very good ergonomic return on …
c++ - copy elision of temporary object - Stack Overflow
Dec 6, 2017 · Several things are going on here. funcElision is omitting the copy in its return because of Named Return Value Optimization (NRVO), a special rule for named return values …
c++ Moving a temporary object prevents copy elision (fix available ...
Mar 16, 2023 · 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 …
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