95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
// { dg-do run { target c++11 } }
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// 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu>
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//
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// Copyright (C) 2005-2021 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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// 20.7.15 polymorphic function object wrapper
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#include <functional>
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#include <testsuite_hooks.h>
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#include <testsuite_tr1.h>
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template<typename T>
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const T&
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as_const(T& t)
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{ return t; }
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// Check that f's target is a reference_wrapper bound to obj.
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template<typename Function, typename T>
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bool
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wraps(Function& f, T& obj)
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{
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using ref_wrapper_type = std::reference_wrapper<T>;
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auto* p = f.template target<ref_wrapper_type>();
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return std::addressof(p->get()) == std::addressof(obj);
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}
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// Put reference_wrappers to function pointers into function<> wrappers
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void test07()
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{
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using std::function;
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using std::ref;
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using std::cref;
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using std::reference_wrapper;
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int (*fptr)(float) = __gnu_test::truncate_float;
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function<int(float)> f1(ref(fptr));
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VERIFY( f1 );
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VERIFY( !!f1 );
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VERIFY( !(f1 == 0) );
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VERIFY( !(0 == f1) );
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VERIFY( f1 != 0 );
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VERIFY( 0 != f1 );
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// Invocation
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VERIFY( f1(3.1f) == 3 );
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// target_type and target() functions
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const function<int(float)>& f1c = f1;
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using ref_wrapper_type = reference_wrapper<int(*)(float)>;
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VERIFY( typeid(ref_wrapper_type) == f1.target_type() );
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VERIFY( f1.target<ref_wrapper_type>() != nullptr );
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VERIFY( wraps(f1, fptr) );
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VERIFY( wraps(f1c, fptr) );
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function<int(float)> f2(cref(fptr));
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VERIFY( f2 );
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VERIFY( !!f2 );
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VERIFY( !(f2 == 0) );
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VERIFY( !(0 == f2) );
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VERIFY( f2 != 0 );
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VERIFY( 0 != f2 );
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// Invocation
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VERIFY( f2(3.1f) == 3 );
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// target_type and target() functions
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const function<int(float)>& f2c = f2;
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using cref_wrapper_type = reference_wrapper<int(* const)(float)>;
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VERIFY( typeid(cref_wrapper_type) == f2.target_type() );
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VERIFY( wraps(f2, as_const(fptr)) );
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VERIFY( f2c.target_type() == f2.target_type() );
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VERIFY( wraps(f2c, as_const(fptr)) );
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}
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int main()
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{
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test07();
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return 0;
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}
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