58 lines
2 KiB
C++
58 lines
2 KiB
C++
// Copyright (C) 2020-2024 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// expensive: * [1-9] * *
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#include "bits/main.h"
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template <class V>
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struct call_generator
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{
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template <class F>
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auto
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operator()(const F& f) -> decltype(V(f));
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};
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using schar = signed char;
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using uchar = unsigned char;
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using ullong = unsigned long long;
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template <typename V>
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void
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test()
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{
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using T = typename V::value_type;
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V x([](int) { return T(1); });
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COMPARE(x, V(1));
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// unconditionally returns int from generator lambda
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x = V([](int) { return 1; });
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COMPARE(x, V(1));
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x = V([](auto i) { return T(i); });
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COMPARE(x, V([](T i) { return i; }));
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VERIFY((// that int always works
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sfinae_is_callable<int (&)(int)>(call_generator<V>())));
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COMPARE(sfinae_is_callable<schar (&)(int)>(call_generator<V>()),
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std::is_signed<T>::value);
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COMPARE(sfinae_is_callable<uchar (&)(int)>(call_generator<V>()),
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!(std::is_signed_v<T> && sizeof(T) <= sizeof(uchar)));
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COMPARE(sfinae_is_callable<float (&)(int)>(call_generator<V>()),
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(std::is_floating_point<T>::value));
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COMPARE(sfinae_is_callable<ullong (&)(int)>(call_generator<V>()),
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std::__finite_max_v<T> >= std::__finite_max_v<ullong>
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&& std::__digits_v<T> >= std::__digits_v<ullong>);
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}
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