Viewing file:  Wpessimizing-move3.C (1.09 KB) -rw-r--r--
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// PR c++/86981
// { dg-do compile { target c++11 } }
// { dg-options "-Wpessimizing-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 { };
struct U { U(T); };
template<typename Tp>
T
fn1 ()
{
T t;
// Non-dependent type.
return std::move (t); // { dg-warning "moving a local object in a return statement prevents copy elision" }
}
template<typename Tp1, typename Tp2>
Tp1
fn2 ()
{
Tp2 t;
return std::move (t); // { dg-warning "moving a local object in a return statement prevents copy elision" }
}
template<typename Tp1, typename Tp2>
Tp1
fn3 ()
{
Tp2 t;
return std::move (t);
}
int
main ()
{
fn1<T>();
fn2<T, T>();
fn3<U, T>();
}
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