Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp0x/sfinae2.C @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
---|---|
date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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// PR c++/44967 // { dg-do compile { target c++11 } } template <typename T> T&& declval(); template<typename T1, typename T2, typename... Args> struct has_construct { typedef char one; typedef struct {char _m[2]; } two; template<typename U1, typename U2, typename... Args2> static decltype(declval<U1>().construct(declval<U2*>(), declval<Args2>()...), one()) test(int); template<typename, typename, typename...> static two test(...); static const bool value = sizeof(test<T1, T2, Args...>(0)) == 1; }; struct A0 {}; struct A1 { void construct(int*, int); }; template<typename _Tp> struct A2 { template<typename _Tp1, typename... _Args> void construct(_Tp1*, _Args&&...) {} }; #define SA(X) static_assert(X,#X) SA((!has_construct<A0, int, int>::value)); // ok SA((has_construct<A1, int, int>::value)); // bang SA((has_construct<A2<int>, int>::value)); // bang