Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/cpp2a/concepts-ts6.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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// { dg-do compile { target c++2a } } // { dg-additional-options "-fconcepts-ts" } template<typename T, int N, typename... Xs> concept bool C1 = true; template<template<typename> class X> concept bool C2 = true; template<typename... Ts> concept bool C3 = true; C1{A, B, ...C} struct S1 { }; C2{T} void f(); C2{...Ts} void g(); // { dg-error "cannot be introduced" } C3{...Ts} struct S2 { }; C3{T, U, V} struct S3 { }; C3{...Ts, U} struct S4 { }; // { dg-error "cannot deduce template parameters" } template<typename> struct X { }; void driver1() { S1<int, 0, char, bool, float> s1a; S1<0, 0, char, bool, float> s1b; // { dg-error "type/value mismatch" } f<X>(); f<int>(); // { dg-error "no matching function for call" } S2<int> s2a; S2<char, signed char, unsigned char> s2b; S2<0> s2c; // { dg-error "type/value mismatch" } S3<int, int, int> s3a; S3<int, int> s3b; // { dg-error "wrong number of template arguments" } } template<typename... Args> struct all_same; template<typename T, typename U, typename... Args> struct all_same<T, U, Args...> { static constexpr bool value = __is_same_as(T, U) && all_same<U, Args...>::value; }; template<typename T> struct all_same<T> { static constexpr bool value = true; }; template<> struct all_same<> { static constexpr bool value = true; }; template<typename... Ts> concept AllSame = all_same<Ts...>::value; AllSame{...Ts} struct S5 { }; AllSame{T, U} struct S6 { }; void driver2() { S5<int, int> s5a; S5<int, int, int, int> s5b; S5<int, int, int, char> s5c; // { dg-error "template constraint failure" } S6<void, void> s6a; S6<void, int> s6c; // { dg-error "template constraint failure" } S6<void, void, void> s6b; // { dg-error "wrong number of template arguments" } }