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// P1169R4 - static operator()
// { dg-do compile { target c++11 } }
// { dg-options "" }
template <typename T>
struct S
{
static constexpr bool operator () (T const &x, T const &y) { return x < y; }; // { dg-warning "may be a static member function only with" "" { target c++20_down } }
using P = bool (*) (T const &, T const &);
operator P () const { return operator (); }
};
static_assert (S<int> {} (1, 2), "");
template <typename T>
void
bar (T &x)
{
x (1, 2);
}
void
foo ()
{
#if __cpp_constexpr >= 201603L
auto a = [](int x, int y) static constexpr { return x + y; }; // { dg-warning "'static' only valid in lambda with" "" { target { c++17 && c++20_down } } }
static_assert (a (1, 2) == 3, "");
bar (*a);
#endif
auto b = []() static { return 1; }; // { dg-warning "'static' only valid in lambda with" "" { target c++20_down } }
b ();
auto c = [](int x, int y) static { return x + y; }; // { dg-warning "'static' only valid in lambda with" "" { target c++20_down } }
c (1, 2);
bar (*c);
#if __cpp_generic_lambdas >= 201707L
auto d = []<typename T, typename U>(T x, U y) static { return x + y; }; // { dg-warning "'static' only valid in lambda with" "" { target c++20_only } }
d (1, 2L);
#endif
S<long> s;
s(1L, 2L);
}
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