101 lines
4.4 KiB
C++
101 lines
4.4 KiB
C++
// Support parsing of concepts
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// RUN: %clang_cc1 -std=c++20 -verify %s
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template<typename T> concept C1 = true; // expected-note 2{{previous}}
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template<typename T> concept C1 = true; // expected-error{{redefinition}}
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template<concept T> concept D1 = true;
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// expected-error@-1{{expected template parameter}}
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// expected-error@-2{{concept template parameter list must have at least one parameter; explicit specialization of concepts is not allowed}}
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template<template<typename> concept T> concept D2 = true;
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// expected-error@-1{{expected identifier}}
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// expected-error@-2{{template template parameter requires 'class' after the parameter list}}
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// expected-error@-3{{concept template parameter list must have at least one parameter; explicit specialization of concepts is not allowed}}
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struct S1 {
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template<typename T> concept C1 = true; // expected-error {{concept declarations may only appear in global or namespace scope}}
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};
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extern "C++" {
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template<typename T> concept C1 = true; // expected-error{{redefinition}}
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}
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template<typename A>
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template<typename B>
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concept C2 = true; // expected-error {{extraneous template parameter list in concept definition}}
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template<typename T> concept C3 = true; // expected-note {{previous}} expected-note {{previous}}
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int C3; // expected-error {{redefinition}}
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struct C3 {}; // expected-error {{redefinition}}
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struct C4 {}; // expected-note{{previous definition is here}}
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template<typename T> concept C4 = true;
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// expected-error@-1{{redefinition of 'C4' as different kind of symbol}}
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// TODO: Add test to prevent explicit specialization, partial specialization
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// and explicit instantiation of concepts.
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template<typename T, T v>
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struct integral_constant { static constexpr T value = v; };
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namespace N {
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template<typename T> concept C5 = true;
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}
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using N::C5;
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template <bool word> concept C6 = integral_constant<bool, wor>::value;
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// expected-error@-1{{use of undeclared identifier 'wor'; did you mean 'word'?}}
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// expected-note@-2{{'word' declared here}}
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template<typename T> concept bool C7 = true;
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// expected-warning@-1{{ISO C++20 does not permit the 'bool' keyword after 'concept'}}
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template<> concept C8 = false;
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// expected-error@-1{{concept template parameter list must have at least one parameter; explicit specialization of concepts is not allowed}}
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template<> concept C7<int> = false;
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// expected-error@-1{{name defined in concept definition must be an identifier}}
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template<typename T> concept N::C9 = false;
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// expected-error@-1{{name defined in concept definition must be an identifier}}
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class A { };
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// expected-note@-1{{'A' declared here}}
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template<typename T> concept A::C10 = false;
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// expected-error@-1{{expected namespace name}}
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template<typename T> concept operator int = false;
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// expected-error@-1{{name defined in concept definition must be an identifier}}
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template<bool x> concept C11 = 2; // expected-error {{atomic constraint must be of type 'bool' (found 'int')}}
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template<bool x> concept C12 = 2 && x; // expected-error {{atomic constraint must be of type 'bool' (found 'int')}}
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template<bool x> concept C13 = x || 2 || x; // expected-error {{atomic constraint must be of type 'bool' (found 'int')}}
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template<bool x> concept C14 = 8ull && x || x; // expected-error {{atomic constraint must be of type 'bool' (found 'unsigned long long')}}
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template<typename T> concept C15 = sizeof(T); // expected-error {{atomic constraint must be of type 'bool'}}
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template<typename T> concept C16 = true && (0 && 0); // expected-error {{atomic constraint must be of type 'bool' (found 'int')}}
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// expected-warning@-1{{use of logical '&&' with constant operand}}
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// expected-note@-2{{use '&' for a bitwise operation}}
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// expected-note@-3{{remove constant to silence this warning}}
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template<typename T> concept C17 = T{};
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static_assert(!C17<bool>);
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template<typename T> concept C18 = (bool&&)true;
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static_assert(C18<int>);
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template<typename T> concept C19 = (const bool&)true;
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static_assert(C19<int>);
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template<typename T> concept C20 = (const bool)true;
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static_assert(C20<int>);
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template <bool c> concept C21 = integral_constant<bool, c>::value && true;
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static_assert(C21<true>);
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static_assert(!C21<false>);
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template <bool c> concept C22 = integral_constant<bool, c>::value;
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static_assert(C22<true>);
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static_assert(!C22<false>);
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template <bool word> concept C23 = integral_constant<bool, wor>::value;
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// expected-error@-1{{use of undeclared identifier 'wor'; did you mean 'word'?}}
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// expected-note@-2{{'word' declared here}}
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