141 lines
6.4 KiB
C++
141 lines
6.4 KiB
C++
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// RUN: %clang_cc1 -std=c++2a -x c++ -verify %s
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template<typename T>
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concept C1 = sizeof(T) == 1;
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// expected-note@-1 2{{because 'sizeof(short) == 1' (2 == 1) evaluated to false}}
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// expected-note@-2 {{because 'sizeof(int) == 1' (4 == 1) evaluated to false}}
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template<C1 T> // expected-note {{because 'int' does not satisfy 'C1'}}
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using A = T;
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using a1 = A<int>; // expected-error {{constraints not satisfied for alias template 'A' [with T = int]}}
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using a2 = A<char>;
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template<typename T>
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concept C2 = sizeof(T) == 2;
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// expected-note@-1 {{because 'sizeof(char) == 2' (1 == 2) evaluated to false}}
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template<C1 T1, C2 T2>
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// expected-note@-1 2{{because 'short' does not satisfy 'C1'}}
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// expected-note@-2 {{because 'char' does not satisfy 'C2'}}
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using B = T1;
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using b1 = B<char, short>;
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using b2 = B<char, char>; // expected-error {{constraints not satisfied for alias template 'B' [with T1 = char, T2 = char]}}
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using b3 = B<short, short>; // expected-error {{constraints not satisfied for alias template 'B' [with T1 = short, T2 = short]}}
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using b4 = B<short, char>; // expected-error {{constraints not satisfied for alias template 'B' [with T1 = short, T2 = char]}}
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template<typename... T>
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concept C3 = (sizeof(T) + ...) == 12;
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// expected-note@-1 {{because 'sizeof(char [11]) == 12' (11 == 12) evaluated to false}}
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// expected-note@-2 {{because 'sizeof(char [10]) == 12' (10 == 12) evaluated to false}}
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// expected-note@-3 3{{because 'sizeof(int) == 12' (4 == 12) evaluated to false}}
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// expected-note@-4 6{{because 'sizeof(short) == 12' (2 == 12) evaluated to false}}
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template<C3 T1, C3 T2, C3 T3>
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// expected-note@-1 {{because 'char [11]' does not satisfy 'C3'}}
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// expected-note@-2 {{because 'char [10]' does not satisfy 'C3'}}
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using C = T2;
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using c1 = C<char[12], int[3], short[6]>;
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using c2 = C<char[12], char[11], char[10]>;
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// expected-error@-1 {{constraints not satisfied for alias template 'C' [with T1 = char [12], T2 = char [11], T3 = char [10]]}}
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using c3 = C<char[12], char[12], char[10]>;
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// expected-error@-1 {{constraints not satisfied for alias template 'C' [with T1 = char [12], T2 = char [12], T3 = char [10]]}}
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template<C3... Ts>
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// expected-note@-1 {{because 'int' does not satisfy 'C3'}}
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// expected-note@-2 2{{and 'int' does not satisfy 'C3'}}
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// expected-note@-3 {{because 'short' does not satisfy 'C3'}}
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// expected-note@-4 5{{and 'short' does not satisfy 'C3'}}
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using D = int;
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using d1 = D<char[12], int[3], short[6]>;
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using d2 = D<int, int, int>;
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// expected-error@-1 {{constraints not satisfied for alias template 'D' [with Ts = <int, int, int>}}
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using d3 = D<short, short, short, short, short, short>;
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// expected-error@-1 {{constraints not satisfied for alias template 'D' [with Ts = <short, short, short, short, short, short>}}
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template<typename T>
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concept C4 = sizeof(T) == 4;
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// expected-note@-1 3{{because 'sizeof(char) == 4' (1 == 4) evaluated to false}}
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template<C4... Ts>
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// expected-note@-1 2{{because 'char' does not satisfy 'C4'}}
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// expected-note@-2 {{and 'char' does not satisfy 'C4'}}
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using E = int;
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using e1 = E<int>;
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using e2 = E<char, int>; // expected-error {{constraints not satisfied for alias template 'E' [with Ts = <char, int>]}}
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using e3 = E<char, char>; // expected-error {{constraints not satisfied for alias template 'E' [with Ts = <char, char>]}}
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using e4 = E<>;
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template<typename T, typename U>
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constexpr bool is_same_v = false;
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template<typename T>
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constexpr bool is_same_v<T, T> = true;
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template<typename T, typename U>
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concept Same = is_same_v<T, U>; // expected-note {{because 'is_same_v<long, int>' evaluated to false}}
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template<Same<int> T> // expected-note {{because 'Same<long, int>' evaluated to false}}
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using F = T;
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using f1 = F<int>;
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using f2 = F<long>; // expected-error {{constraints not satisfied for alias template 'F' [with T = long]}}
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template<typename T, typename... Ts>
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concept OneOf = (is_same_v<T, Ts> || ...);
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// expected-note@-1 2{{because 'is_same_v<char, char [1]>' evaluated to false}}
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// expected-note@-2 2{{and 'is_same_v<char, char [2]>' evaluated to false}}
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// expected-note@-3 {{because 'is_same_v<short, int>' evaluated to false}}
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// expected-note@-4 {{and 'is_same_v<short, long>' evaluated to false}}
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// expected-note@-5 {{and 'is_same_v<short, char>' evaluated to false}}
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// expected-note@-6 3{{because 'is_same_v<int, char [1]>' evaluated to false}}
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// expected-note@-7 3{{and 'is_same_v<int, char [2]>' evaluated to false}}
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// expected-note@-8 2{{because 'is_same_v<nullptr_t, char>' evaluated to false}}
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// expected-note@-9 2{{and 'is_same_v<nullptr_t, int>' evaluated to false}}
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template<OneOf<char[1], char[2]> T, OneOf<int, long, char> U>
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// expected-note@-1 2{{because 'OneOf<char, char [1], char [2]>' evaluated to false}}
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// expected-note@-2 {{because 'OneOf<short, int, long, char>' evaluated to false}}
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using G = T;
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using g1 = G<char[1], int>;
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using g2 = G<char, int>; // expected-error{{constraints not satisfied for alias template 'G' [with T = char, U = int]}}
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using g3 = G<char[1], short>; // expected-error{{constraints not satisfied for alias template 'G' [with T = char [1], U = short]}}
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using g4 = G<char, short>; // expected-error{{constraints not satisfied for alias template 'G' [with T = char, U = short]}}
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template<OneOf<char[1], char[2]>... Ts>
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// expected-note@-1 2{{because 'OneOf<int, char [1], char [2]>' evaluated to false}}
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// expected-note@-2 {{and 'OneOf<int, char [1], char [2]>' evaluated to false}}
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using H = int;
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using h1 = H<char[1], int>;
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// expected-error@-1 {{constraints not satisfied for alias template 'H' [with Ts = <char [1], int>]}}
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using h2 = H<int, int>;
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// expected-error@-1 {{constraints not satisfied for alias template 'H' [with Ts = <int, int>]}}
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using h3 = H<char[1], char[2]>;
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template<OneOf<char, int> auto x>
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// expected-note@-1 {{because 'OneOf<decltype(nullptr), char, int>' evaluated to false}}
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using I = int;
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using i1 = I<1>;
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using i2 = I<'a'>;
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using i3 = I<nullptr>;
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// expected-error@-1 {{constraints not satisfied for alias template 'I' [with x = nullptr]}}
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template<OneOf<char, int> auto... x>
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// expected-note@-1 {{because 'OneOf<decltype(nullptr), char, int>' evaluated to false}}
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using J = int;
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using j1 = J<1, 'b'>;
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using j2 = J<'a', nullptr>;
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// expected-error@-1 {{constraints not satisfied for alias template 'J' [with x = <'a', nullptr>]}}
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template<OneOf<char, int> auto &x>
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// expected-error@-1 {{constrained placeholder types other than simple 'auto' on non-type template parameters not supported yet}}
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using K = int;
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