68 lines
3.3 KiB
C++
68 lines
3.3 KiB
C++
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// RUN: %clang_cc1 -std=c++20 -verify %s
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namespace PR47043 {
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template<typename T> concept True = true;
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template<typename ...T> concept AllTrue1 = True<T>; // expected-error {{expression contains unexpanded parameter pack 'T'}}
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template<typename ...T> concept AllTrue2 = (True<T> && ...);
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static_assert(AllTrue2<int, float, char>);
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}
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namespace PR47025 {
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template<typename ...T> concept AllAddable1 = requires(T ...t) { (void(t + 1), ...); };
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template<typename ...T> concept AllAddable2 = (requires(T ...t) { (t + 1); } && ...); // expected-error {{requirement contains unexpanded parameter pack 't'}}
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template<typename ...T> concept AllAddable3 = (requires(T t) { (t + 1); } && ...);
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template<typename ...T> concept AllAddable4 = requires(T t) { (t + 1); }; // expected-error {{expression contains unexpanded parameter pack 'T'}}
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template<typename ...T> concept AllAddable5 = requires(T t) { (void(t + 1), ...); }; // expected-error {{does not contain any unexpanded}}
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template<typename ...T> concept AllAddable6 = (requires { (T() + 1); } && ...);
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template<typename ...T> concept AllAddable7 = requires { (T() + 1); }; // expected-error {{expression contains unexpanded parameter pack 'T'}}
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static_assert(AllAddable1<int, float>);
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static_assert(AllAddable3<int, float>);
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static_assert(AllAddable6<int, float>);
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static_assert(!AllAddable1<int, void>);
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static_assert(!AllAddable3<int, void>);
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static_assert(!AllAddable6<int, void>);
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}
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namespace PR45699 {
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template<class> concept C = true; // expected-note 2{{here}}
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template<class ...Ts> void f1a() requires C<Ts>; // expected-error {{requires clause contains unexpanded parameter pack 'Ts'}}
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template<class ...Ts> requires C<Ts> void f1b(); // expected-error {{requires clause contains unexpanded parameter pack 'Ts'}}
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template<class ...Ts> void f2a() requires (C<Ts> && ...);
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template<class ...Ts> requires (C<Ts> && ...) void f2b();
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template<class ...Ts> void f3a() requires C<Ts...>; // expected-error {{pack expansion used as argument for non-pack parameter of concept}}
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template<class ...Ts> requires C<Ts...> void f3b(); // expected-error {{pack expansion used as argument for non-pack parameter of concept}}
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template<class ...Ts> void f4() {
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([] () requires C<Ts> {} ()); // expected-error {{expression contains unexpanded parameter pack 'Ts'}}
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([]<int = 0> requires C<Ts> () {} ()); // expected-error {{expression contains unexpanded parameter pack 'Ts'}}
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}
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template<class ...Ts> void f5() {
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([] () requires C<Ts> {} (), ...);
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([]<int = 0> requires C<Ts> () {} (), ...);
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}
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void g() {
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f1a();
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f1b(); // FIXME: Bad error recovery. expected-error {{undeclared identifier}}
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f2a();
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f2b();
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f3a();
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f3b(); // FIXME: Bad error recovery. expected-error {{undeclared identifier}}
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f4();
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f5();
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}
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}
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namespace P0857R0 {
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void f() {
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auto x = []<bool B> requires B {}; // expected-note {{constraints not satisfied}} expected-note {{false}}
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x.operator()<true>();
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x.operator()<false>(); // expected-error {{no matching member function}}
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}
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// FIXME: This is valid under P0857R0.
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template<typename T> concept C = true;
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template<template<typename T> requires C<T> typename U> struct X {}; // expected-error {{requires 'class'}} expected-error 0+{{}}
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template<typename T> requires C<T> struct Y {};
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X<Y> xy; // expected-error {{no template named 'X'}}
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}
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