Retro68/gcc/libstdc++-v3/testsuite/experimental/functional/not_fn.cc
Wolfgang Thaller 6fbf4226da gcc-9.1
2019-06-20 20:10:10 +02:00

103 lines
2.2 KiB
C++

// Copyright (C) 2014-2019 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/>.
// { dg-do run { target c++14 } }
#include <experimental/functional>
#include <testsuite_hooks.h>
using std::experimental::not_fn;
int func(int, char) { return 0; }
struct F
{
bool operator()() { return false; }
bool operator()() const { return true; }
bool operator()(int) { return false; }
};
void
test01()
{
auto f1 = not_fn(func);
VERIFY( f1(1, '2') == true );
auto f2 = not_fn( [] { return true; } );
VERIFY( f2() == false );
auto f3 = not_fn( F{} );
VERIFY( f3() == true );
VERIFY( f3(1) == true );
const auto f4 = f3;
VERIFY( f4() == false );
}
template<typename F, typename Arg>
auto foo(F f, Arg arg) -> decltype(not_fn(f)(arg)) { return not_fn(f)(arg); }
template<typename F, typename Arg>
auto foo(F f, Arg arg) -> decltype(not_fn(f)()) { return not_fn(f)(); }
struct negator
{
bool operator()(int) const { return false; }
void operator()() const {}
};
void
test02()
{
foo(negator{}, 1); // PR libstdc++/66998
}
void
test03()
{
struct X { bool b; };
X x{ false };
VERIFY( not_fn(&X::b)(x) );
}
void
test04()
{
struct abstract { virtual void f() = 0; };
struct derived : abstract { void f() { } };
struct F { bool operator()(abstract&) { return false; } };
F f;
derived d;
VERIFY( not_fn(f)(d) );
}
void
test05()
{
auto nf = std::experimental::not_fn([] { return false; });
auto copy(nf); // PR libstdc++/70564
}
int
main()
{
test01();
test02();
test03();
test04();
test05();
}