Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/template/sfinae6.C @ 131:84e7813d76e9
gcc-8.2
author | mir3636 |
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date | Thu, 25 Oct 2018 07:37:49 +0900 |
parents | 04ced10e8804 |
children |
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// DR 339 // // Test of the use of the function call operator with SFINAE typedef char yes_type; struct no_type { char data[2]; }; template<typename T> T create_a(); template<typename T> struct type { }; template<bool, typename T = void> struct enable_if { typedef T type; }; template<typename T> struct enable_if<false, T> { }; template<typename F, typename T1, typename T2> typename enable_if<sizeof(create_a<F>()(create_a<T1>(), create_a<T2>()), 1), yes_type>::type check_is_callable2(type<F>, type<T1>, type<T2>); no_type check_is_callable2(...); template<typename F, typename T1, typename T2 = T1> struct is_callable2 { static const bool value = (sizeof(check_is_callable2(type<F>(), type<T1>(), type<T2>())) == sizeof(yes_type)); }; #define JOIN( X, Y ) DO_JOIN( X, Y ) #define DO_JOIN( X, Y ) DO_JOIN2(X,Y) #define DO_JOIN2( X, Y ) X##Y #ifdef __GXX_EXPERIMENTAL_CXX0X__ # define STATIC_ASSERT(Expr) static_assert(Expr, #Expr) #else # define STATIC_ASSERT(Expr) int JOIN(a,__LINE__)[Expr? 1 : -1] #endif struct A; struct B; struct A { A(B); }; struct B { B(A); }; struct F1 { }; struct F2 { bool operator()(int, float); }; struct F3 { bool operator()(int); }; struct F4 { void operator()(A, A); void operator()(B, B); }; struct F5 { void operator()(A, A); private: void operator()(B, B); }; STATIC_ASSERT((is_callable2<int(*)(int, int), long, int>::value)); STATIC_ASSERT((!is_callable2<int(*)(int, int), int*, int>::value)); STATIC_ASSERT((!is_callable2<F1, int, int>::value)); STATIC_ASSERT((is_callable2<F2, int, int>::value)); STATIC_ASSERT((!is_callable2<F2, int*, int>::value)); STATIC_ASSERT((!is_callable2<F3, int, int>::value)); STATIC_ASSERT((is_callable2<F4, A, A>::value)); STATIC_ASSERT((is_callable2<F4, B, B>::value)); STATIC_ASSERT((!is_callable2<F4, A, B>::value)); STATIC_ASSERT((is_callable2<F5, A, A>::value)); STATIC_ASSERT((!is_callable2<F5, A, B>::value));