1 // 2005-01-15 Douglas Gregor <dgregor@cs.indiana.edu> 2 // 3 // Copyright (C) 2005-2021 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 // 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 // 16 // You should have received a copy of the GNU General Public License along 17 // with this library; see the file COPYING3. If not see 18 // <http://www.gnu.org/licenses/>. 19 20 // 3.7.2 polymorphic function object wrapper 21 #include <tr1/functional> 22 #include <testsuite_hooks.h> 23 #include <testsuite_tr1.h> 24 25 using namespace __gnu_test; 26 27 // Put nearly-matching function pointers into function<> wrappers test03()28void test03() 29 { 30 using std::tr1::function; 31 32 function<int(float)> f1(truncate_double); 33 VERIFY( f1 ); 34 VERIFY( !!f1 ); 35 VERIFY( !(f1 == 0) ); 36 VERIFY( !(0 == f1) ); 37 VERIFY( f1 != 0 ); 38 VERIFY( 0 != f1 ); 39 40 // Copy-construction 41 function<int(float)> f2(f1); 42 VERIFY( f2 ); 43 44 // Invocation 45 VERIFY( f1(3.1f) == 3 ); 46 VERIFY( f2(3.1f) == 3 ); 47 48 // Assignment to zero 49 f1 = 0; 50 VERIFY( !f1 ); 51 52 // Swap 53 f1.swap(f2); 54 VERIFY( f1 ); 55 VERIFY( !f2 ); 56 VERIFY( f1(3.1f) == 3 ); 57 58 // Assignment from a function pointer 59 f2 = truncate_double; 60 VERIFY( f2(3.1f) == 3 ); 61 62 // target_type and target() functions 63 const function<int(float)>& f1c = f1; 64 VERIFY( typeid(long(*)(double)) == f1.target_type() ); 65 VERIFY( f2.target<long(*)(double)>() != 0 ); 66 VERIFY( *f2.target<long(*)(double)>() == &truncate_double ); 67 VERIFY( f1c.target<long(*)(double)>() != 0 ); 68 VERIFY( *f1c.target<long(*)(double)>() == &truncate_double ); 69 } 70 main()71int main() 72 { 73 test03(); 74 return 0; 75 } 76