blob: 0617e3cdc5dbe29c163bf590eddccbdbd77adbe2 [file] [log] [blame]
// { dg-do run { target c++11 } }
// 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
//
// Copyright (C) 2005-2022 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/>.
// 20.7.15 polymorphic function object wrapper
#include <functional>
#include <testsuite_hooks.h>
#include <testsuite_tr1.h>
template<typename T>
const T&
as_const(T& t)
{ return t; }
// Check that f's target is a reference_wrapper bound to obj.
template<typename Function, typename T>
bool
wraps(Function& f, T& obj)
{
using ref_wrapper_type = std::reference_wrapper<T>;
auto* p = f.template target<ref_wrapper_type>();
return std::addressof(p->get()) == std::addressof(obj);
}
// Put reference_wrappers to function pointers into function<> wrappers
void test07()
{
using std::function;
using std::ref;
using std::cref;
using std::reference_wrapper;
int (*fptr)(float) = __gnu_test::truncate_float;
function<int(float)> f1(ref(fptr));
VERIFY( f1 );
VERIFY( !!f1 );
VERIFY( !(f1 == 0) );
VERIFY( !(0 == f1) );
VERIFY( f1 != 0 );
VERIFY( 0 != f1 );
// Invocation
VERIFY( f1(3.1f) == 3 );
// target_type and target() functions
const function<int(float)>& f1c = f1;
using ref_wrapper_type = reference_wrapper<int(*)(float)>;
VERIFY( typeid(ref_wrapper_type) == f1.target_type() );
VERIFY( f1.target<ref_wrapper_type>() != nullptr );
VERIFY( wraps(f1, fptr) );
VERIFY( wraps(f1c, fptr) );
function<int(float)> f2(cref(fptr));
VERIFY( f2 );
VERIFY( !!f2 );
VERIFY( !(f2 == 0) );
VERIFY( !(0 == f2) );
VERIFY( f2 != 0 );
VERIFY( 0 != f2 );
// Invocation
VERIFY( f2(3.1f) == 3 );
// target_type and target() functions
const function<int(float)>& f2c = f2;
using cref_wrapper_type = reference_wrapper<int(* const)(float)>;
VERIFY( typeid(cref_wrapper_type) == f2.target_type() );
VERIFY( wraps(f2, as_const(fptr)) );
VERIFY( f2c.target_type() == f2.target_type() );
VERIFY( wraps(f2c, as_const(fptr)) );
}
int main()
{
test07();
return 0;
}