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// Copyright (C) 2020-2023 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// expensive: * [1-9] * *
#include "bits/main.h"
template <class V>
struct call_generator
{
template <class F>
auto
operator()(const F& f) -> decltype(V(f));
};
using schar = signed char;
using uchar = unsigned char;
using ullong = unsigned long long;
template <typename V>
void
test()
{
using T = typename V::value_type;
V x([](int) { return T(1); });
COMPARE(x, V(1));
// unconditionally returns int from generator lambda
x = V([](int) { return 1; });
COMPARE(x, V(1));
x = V([](auto i) { return T(i); });
COMPARE(x, V([](T i) { return i; }));
VERIFY((// that int always works
sfinae_is_callable<int (&)(int)>(call_generator<V>())));
COMPARE(sfinae_is_callable<schar (&)(int)>(call_generator<V>()),
std::is_signed<T>::value);
COMPARE(sfinae_is_callable<uchar (&)(int)>(call_generator<V>()),
!(std::is_signed_v<T> && sizeof(T) <= sizeof(uchar)));
COMPARE(sfinae_is_callable<float (&)(int)>(call_generator<V>()),
(std::is_floating_point<T>::value));
COMPARE(sfinae_is_callable<ullong (&)(int)>(call_generator<V>()),
std::__finite_max_v<T> >= std::__finite_max_v<ullong>
&& std::__digits_v<T> >= std::__digits_v<ullong>);
}
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