63 lines
2.3 KiB
C++
63 lines
2.3 KiB
C++
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// RUN: %clang_cc1 -std=c++2a -verify %s
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struct S2 {};
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// expected-note@-1 {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'S1' to 'const S2' for 1st argument}}
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// expected-note@-2 {{candidate constructor (the implicit move constructor) not viable: no known conversion from 'S1' to 'S2' for 1st argument}}
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// expected-note@-3 {{candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided}}
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struct S1 {
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void foo() const requires true {}
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void foo() const requires false {}
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void bar() const requires false {}
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// expected-note@-1 {{because 'false' evaluated to false}}
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operator bool() const requires true { return true; }
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explicit operator bool() const requires false;
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explicit operator S2() const requires false;
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// expected-note@-1 {{candidate function not viable: constraints not satisfied}}
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// expected-note@-2 {{because 'false' evaluated to false}}
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};
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void foo() {
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S1().foo();
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S1().bar();
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// expected-error@-1 {{invalid reference to function 'bar': constraints not satisfied}}
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(void) static_cast<bool>(S1());
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(void) static_cast<S2>(S1());
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// expected-error@-1 {{no matching conversion for static_cast from 'S1' to 'S2'}}
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}
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// Test that constraints are checked before implicit conversions are formed.
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template<typename T>
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struct invalid_template { using X = typename T::non_existant; };
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struct A {
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template<typename T, bool=invalid_template<T>::aadasas>
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operator T() {}
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};
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void foo(int) requires false;
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void foo(A) requires true;
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struct S {
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void foo(int) requires false;
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void foo(A) requires true;
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S(A) requires false;
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S(double) requires true;
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~S() requires false;
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// expected-note@-1 2{{because 'false' evaluated to false}}
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~S() requires true;
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operator int() requires true;
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operator int() requires false;
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};
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void bar() {
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foo(A{});
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S{1.}.foo(A{});
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// expected-error@-1{{invalid reference to function '~S': constraints not satisfied}}
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// Note - this behavior w.r.t. constrained dtors is a consequence of current
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// wording, which does not invoke overload resolution when a dtor is called.
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// P0848 is set to address this issue.
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S s = 1;
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// expected-error@-1{{invalid reference to function '~S': constraints not satisfied}}
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int a = s;
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}
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