libstdc++-v3/testsuite/tr1/3_function_objects/result_of.cc

   1 // 2005-01-26 Douglas Gregor <doug.gregor -at- gmail.com>
   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 // { dg-additional-options "-Wno-volatile" { target c++2a } }
  21
  22 // 3.4 function return types
  23 #include <tr1/functional>
  24 #include <tr1/type_traits>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_tr1.h>
  27
  28 class X {};
  29
  30 struct int_result_type { typedef int result_type; };
  31
  32 struct int_result_of
  33 {
  34   template<typename F> struct result { typedef int type; };
  35 };
  36
  37 struct int_result_type_and_float_result_of
  38 {
  39   typedef int result_type;
  40   template<typename F> struct result { typedef float type; };
  41 };
  42
  43 void test01()
  44 {
  45   using std::tr1::result_of;
  46   using std::tr1::is_same;
  47   using namespace __gnu_test;
  48
  49   typedef int (*func_ptr)(float, double);
  50   typedef int (&func_ref)(float, double);
  51   typedef int (::X::*mem_func_ptr)(float);
  52   typedef int (::X::*mem_func_ptr_c)(float) const;
  53   typedef int (::X::*mem_func_ptr_v)(float) volatile;
  54   typedef int (::X::*mem_func_ptr_cv)(float) const volatile;
  55
  56   VERIFY((is_same<result_of<int_result_type(float)>::type, int>::value));
  57   VERIFY((is_same<result_of<int_result_of(double)>::type, int>::value));
  58   VERIFY((is_same<result_of<int_result_of(void)>::type, void>::value));
  59   VERIFY((is_same<result_of<const int_result_of(double)>::type, int>::value));
  60   VERIFY((is_same<result_of<volatile int_result_of(void)>::type, void>::value));
  61   VERIFY((is_same<result_of<int_result_type_and_float_result_of(char)>::type, int>::value));
  62   VERIFY((is_same<result_of<func_ptr(char, float)>::type, int>::value));
  63   VERIFY((is_same<result_of<func_ref(char, float)>::type, int>::value));
  64   VERIFY((is_same<result_of<mem_func_ptr(::X,char)>::type, int>::value));
  65   VERIFY((is_same<result_of<mem_func_ptr_c(::X,char)>::type, int>::value));
  66   VERIFY((is_same<result_of<mem_func_ptr_v(::X,char)>::type, int>::value));
  67   VERIFY((is_same<result_of<mem_func_ptr_cv(::X,char)>::type, int>::value));
  68 }
  69
  70 int main()
  71 {
  72   test01();
  73   return 0;
  74 }