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77 lines
2.0 KiB
C++
77 lines
2.0 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) 2005-2019 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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using namespace __gnu_test;
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// Put nearly-matching function pointers into function<> wrappers
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void test03()
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{
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using std::function;
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function<int(float)> f1(truncate_double);
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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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// Copy-construction
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function<int(float)> f2(f1);
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VERIFY( f2 );
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// Invocation
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VERIFY( f1(3.1f) == 3 );
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VERIFY( f2(3.1f) == 3 );
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// Assignment to zero
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f1 = 0;
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VERIFY( !f1 );
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// Swap
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f1.swap(f2);
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VERIFY( f1 );
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VERIFY( !f2 );
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VERIFY( f1(3.1f) == 3 );
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// Assignment from a function pointer
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f2 = truncate_double;
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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)>& f1c = f1;
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VERIFY( typeid(long(*)(double)) == f1.target_type() );
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VERIFY( f2.target<long(*)(double)>() != 0 );
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VERIFY( *f2.target<long(*)(double)>() == &truncate_double );
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VERIFY( f1c.target<long(*)(double)>() != 0 );
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VERIFY( *f1c.target<long(*)(double)>() == &truncate_double );
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}
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int main()
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{
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test03();
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return 0;
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}
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