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// { dg-do compile { target c++23 } }
// { dg-add-options no_pch }
#include <functional>
#ifndef __cpp_lib_invoke_r
# error Feature-test macro for invoke_r is missing in <functional>
#elif __cpp_lib_invoke_r < 202106L
# error Feature-test macro for invoke_r has the wrong value in <functional>
#endif
constexpr int sq(int i) { return i * i; }
template<typename Val, typename Expected>
constexpr bool chk(Val&& val, Expected&& exp)
{
return std::is_same_v<Val, Expected> && val == exp;
}
void
test01()
{
static_assert( chk( std::invoke(sq, 2), 4 ) );
static_assert( chk( std::invoke_r<int>(sq, 3), 9 ) );
static_assert( chk( std::invoke_r<char>(sq, 4), '\x10' ) );
}
struct abstract {
virtual ~abstract() = 0;
void operator()() noexcept;
};
static_assert( noexcept(std::invoke(std::declval<abstract>())),
"It should be possible to use abstract types with INVOKE" );
static_assert( noexcept(std::invoke_r<void>(std::declval<abstract>())),
"It should be possible to use abstract types with INVOKE<R>" );
struct F {
void operator()() &;
void operator()() && noexcept;
int operator()(int);
double* operator()(int, int) noexcept;
};
struct D { D(void*); };
static_assert( !noexcept(std::invoke(std::declval<F&>())) );
static_assert( noexcept(std::invoke(std::declval<F>())) );
static_assert( !noexcept(std::invoke(std::declval<F>(), 1)) );
static_assert( noexcept(std::invoke(std::declval<F>(), 1, 2)) );
static_assert( !noexcept(std::invoke_r<void>(std::declval<F&>())) );
static_assert( noexcept(std::invoke_r<void>(std::declval<F>())) );
static_assert( !noexcept(std::invoke_r<int>(std::declval<F>(), 1)) );
static_assert( !noexcept(std::invoke_r<void>(std::declval<F>(), 1)) );
static_assert( !noexcept(std::invoke_r<long>(std::declval<F>(), 1)) );
static_assert( noexcept(std::invoke_r<void>(std::declval<F>(), 1, 2)) );
static_assert( noexcept(std::invoke_r<void*>(std::declval<F>(), 1, 2)) );
static_assert( !noexcept(std::invoke_r<D>(std::declval<F>(), 1, 2)) );
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