1 // { dg-do run { target c++11 } } 2 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu> 3 // 4 // Copyright (C) 2005-2019 Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 // 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 // 17 // You should have received a copy of the GNU General Public License along 18 // with this library; see the file COPYING3. If not see 19 // <http://www.gnu.org/licenses/>. 20 21 // 20.7.15 polymorphic function object wrapper 22 #include <functional> 23 #include <testsuite_hooks.h> 24 #include <testsuite_tr1.h> 25 26 using namespace __gnu_test; 27 28 // Put function objects into function<> wrappers test04()29void test04() 30 { 31 using std::function; 32 33 do_truncate_float_t truncate_float; 34 35 function<int(float)> f1(truncate_float); 36 VERIFY( f1 ); 37 VERIFY( !!f1 ); 38 VERIFY( !(f1 == 0) ); 39 VERIFY( !(0 == f1) ); 40 VERIFY( f1 != 0 ); 41 VERIFY( 0 != f1 ); 42 43 // Copy-construction 44 function<int(float)> f2(f1); 45 VERIFY( f2 ); 46 47 // Invocation 48 VERIFY( f1(3.1f) == 3 ); 49 VERIFY( f2(3.1f) == 3 ); 50 51 // Assignment to zero 52 f1 = 0; 53 VERIFY( !f1 ); 54 55 // Swap 56 f1.swap(f2); 57 VERIFY( f1 ); 58 VERIFY( !f2 ); 59 VERIFY( f1(3.1f) == 3 ); 60 61 // Assignment from a function pointer 62 f2 = do_truncate_float_t(); 63 VERIFY( f2(3.1f) == 3 ); 64 65 // target_type and target() functions 66 const function<int(float)>& f1c = f1; 67 VERIFY( typeid(do_truncate_float_t) == f1.target_type() ); 68 VERIFY( f2.target<do_truncate_float_t>() != 0 ); 69 VERIFY( f1c.target<do_truncate_float_t>() != 0 ); 70 } 71 main()72int main() 73 { 74 test04(); 75 76 VERIFY( do_truncate_double_t::live_objects == 0 ); 77 VERIFY( do_truncate_float_t::live_objects == 0 ); 78 79 return 0; 80 } 81