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// RUN: %clang_cc1 -std=c++20 -verify %s
template <class T>
struct A {
void primary();
};
template <class T>
requires requires(T &t) { requires sizeof(t) > 4; }
struct A<T> {
void specialization1();
};
template <class T>
requires requires(T &t) { requires sizeof(t) > 8; }
struct A<T> {
void specialization2();
};
int main() {
A<char>().primary();
A<char[5]>().specialization1();
A<char[16]>(); // expected-error {{ambiguous partial specialization}}
// expected-note@10 {{partial specialization matches [with T = char[16]}}
// expected-note@16 {{partial specialization matches [with T = char[16]}}
}
// Check error messages when no overload with constraints matches.
template <class T>
void foo()
requires requires(T &t) { requires sizeof(t) < 4; }
{}
template <class T>
void foo()
requires requires(T &t) { requires sizeof(t) > 4; }
{}
template <class T>
void foo()
requires requires(T &t) { requires sizeof(t) > 8; }
{}
void test() {
foo<char[4]>();
// expected-error@-1 {{no matching function for call to 'foo'}}
// expected-note@30 {{candidate template ignored: constraints not satisfied}}
// expected-note@31 {{because 'sizeof (t) < 4' (4 < 4) evaluated to false}}
// expected-note@35 {{candidate template ignored: constraints not satisfied}}
// expected-note@36 {{because 'sizeof (t) > 4' (4 > 4) evaluated to false}}
// expected-note@40 {{candidate template ignored: constraints not satisfied}}
// expected-note@41 {{because 'sizeof (t) > 8' (4 > 8) evaluated to false}}
foo<char[16]>();
// expected-error@-1 {{call to 'foo' is ambiguous}}
// expected-note@35 {{candidate function}}
// expected-note@40 {{candidate function}}
}
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