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// RUN: %clang_cc1 -std=c++2a -verify %s -Wzero-as-null-pointer-constant
// Keep this test before any declarations of operator<=>.
namespace PR44786 {
template<typename T> void f(decltype(T{} <=> T{})) {} // expected-note {{previous}}
struct S {};
int operator<=>(S const &, S const &);
template<typename T> void f(decltype(T{} <=> T{})) {} // expected-error {{redefinition}}
}
struct A {};
constexpr int operator<=>(A a, A b) { return 42; }
static_assert(operator<=>(A(), A()) == 42);
int operator<=>(); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
int operator<=>(A); // expected-error {{overloaded 'operator<=>' must be a binary operator}}
int operator<=>(int, int); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
int operator<=>(A, A, A); // expected-error {{overloaded 'operator<=>' must be a binary operator}}
int operator<=>(A, A, ...); // expected-error {{overloaded 'operator<=>' cannot be variadic}}
int operator<=>(int, A = {}); // expected-error {{parameter of overloaded 'operator<=>' cannot have a default argument}}
struct B {
int &operator<=>(int);
friend int operator<=>(A, B);
friend int operator<=>(int, int); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
void operator<=>(); // expected-error {{overloaded 'operator<=>' must be a binary operator}};
void operator<=>(A, ...); // expected-error {{overloaded 'operator<=>' cannot be variadic}}
void operator<=>(A, A); // expected-error {{overloaded 'operator<=>' must be a binary operator}};
};
int &r = B().operator<=>(0);
namespace PR47893 {
struct A {
void operator<=>(const A&) const;
};
template<typename T> auto f(T a, T b) -> decltype(a < b) = delete;
int &f(...);
int &r = f(A(), A());
}
namespace PR44325 {
struct cmp_cat {};
bool operator<(cmp_cat, void*);
bool operator>(cmp_cat, int cmp_cat::*);
struct X {};
cmp_cat operator<=>(X, X);
bool b1 = X() < X(); // no warning
bool b2 = X() > X(); // no warning
// FIXME: It's not clear whether warning here is useful, but we can't really
// tell that this is a comparison category in general. This is probably OK,
// as comparisons against zero are only really intended for use in the
// implicit rewrite rules, not for explicit use by programs.
bool c = cmp_cat() < 0; // expected-warning {{zero as null pointer constant}}
}
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