derek.holloway
7502bf64a4
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48 lines
2.2 KiB
C++
48 lines
2.2 KiB
C++
// RUN: %clang_cc1 -std=c++2a -verify %s
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// Make sure constraint expressions are unevaluated before being substituted
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// into during satisfaction checking.
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template<typename T> constexpr bool f = T::value;
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// expected-error@-1 4{{type}}
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namespace unevaluated {
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template<typename T> concept Foo = false && f<int>;
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bool k = Foo<int>;
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template<typename T> requires false && f<int> struct S {};
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// expected-note@-1{{because}}
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using s = S<int>; // expected-error {{constraints not satisfied}}
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template<typename T> void foo() requires false && f<int> { };
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// expected-note@-1{{because}} expected-note@-1{{candidate template ignored}}
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int a = (foo<int>(), 0); // expected-error{{no matching function}}
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template<typename T> void bar() requires requires { requires false && f<int>; } { };
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// expected-note@-1{{because}} expected-note@-1{{candidate template ignored}}
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int b = (bar<int>(), 0); // expected-error{{no matching function}}
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template<typename T> struct M { static void foo() requires false && f<int> { }; };
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// expected-note@-1{{because}}
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int c = (M<int>::foo(), 0);
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// expected-error@-1{{invalid reference to function 'foo': constraints not satisfied}}
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}
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namespace constant_evaluated {
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template<typename T> requires f<int[0]> struct S {};
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// expected-note@-1{{in instantiation of}} expected-note@-1{{while substituting}}
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using s = S<int>;
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// expected-note@-1 {{while checking}}
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template<typename T> void foo() requires f<int[1]> { };
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// expected-note@-1{{in instantiation}} expected-note@-1{{while substituting}} \
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expected-note@-1{{candidate template ignored}}
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int a = (foo<int>(), 0);
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// expected-note@-1 {{while checking}} expected-error@-1{{no matching function}} \
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expected-note@-1 {{while substituting}}
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template<typename T> void bar() requires requires { requires f<int[2]>; } { };
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// expected-note@-1{{in instantiation}} \
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expected-note@-1{{while substituting}} \
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expected-note@-1 {{while checking the satisfaction of nested requirement}}
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int b = (bar<int>(), 0);
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template<typename T> struct M { static void foo() requires f<int[3]> { }; };
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// expected-note@-1{{in instantiation}} expected-note@-1{{while substituting}}
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int c = (M<int>::foo(), 0);
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// expected-note@-1 {{while checking}}
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}
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