Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp0x/Wredundant-move1.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
---|---|
date | Thu, 13 Feb 2020 11:34:05 +0900 |
parents | 84e7813d76e9 |
children |
line wrap: on
line source
// PR c++/87029 // { dg-do compile { target c++11 } } // { dg-options "-Wredundant-move" } // Define std::move. namespace std { template<typename _Tp> struct remove_reference { typedef _Tp type; }; template<typename _Tp> struct remove_reference<_Tp&> { typedef _Tp type; }; template<typename _Tp> struct remove_reference<_Tp&&> { typedef _Tp type; }; template<typename _Tp> constexpr typename std::remove_reference<_Tp>::type&& move(_Tp&& __t) noexcept { return static_cast<typename std::remove_reference<_Tp>::type&&>(__t); } } struct T { T() { } T(const T&) { } T(T&&) { } }; struct U { U() { } U(const U&) { } U(U&&) { } U(T) { } }; T fn1 (T t) { return t; } T fn2 (T t) { // Will use move even without std::move. return std::move (t); // { dg-warning "redundant move in return statement" } } T fn3 (const T t) { // t is const: will decay into copy. return t; } T fn4 (const T t) { // t is const: will decay into copy despite std::move, so it's redundant. // We used to warn about this, but no longer since c++/87378. return std::move (t); } int fn5 (int i) { // Not a class type. return std::move (i); } T fn6 (T t, bool b) { if (b) throw std::move (t); return std::move (t); // { dg-warning "redundant move in return statement" } } U fn7 (T t) { // Core 1579 means we'll get a move here. return t; } U fn8 (T t) { // Core 1579 means we'll get a move here. Even without std::move. return std::move (t); // { dg-warning "redundant move in return statement" } } T fn9 (T& t) { // T is a reference and the move isn't redundant. return std::move (t); } T fn10 (T&& t) { // T is a reference and the move isn't redundant. return std::move (t); }