libstdc++-v3/testsuite/20_util/reference_wrapper/invoke.cc

   1 // { dg-options "-std=gnu++0x" }
   2
   3 // Copyright (C) 2008, 2009, 2010 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 #include <functional>
  21 #include <type_traits>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_tr1.h>
  24
  25 using namespace __gnu_test;
  26
  27 bool test __attribute__((unused)) = true;
  28
  29 struct X
  30 {
  31   typedef int result_type;
  32
  33   X() : bar(17) {}
  34
  35   int foo(float x)                   { return truncate_float(x); }
  36   int foo_c(float x)  const          { return truncate_float(x); }
  37   int foo_v(float x)  volatile       { return truncate_float(x); }
  38   int foo_cv(float x) const volatile { return truncate_float(x); }
  39
  40   int operator()(float x)
  41   {
  42     return foo(x) + 1;
  43   }
  44
  45   int operator()(float x) const
  46   {
  47     return foo_c(x) + 2;
  48   }
  49
  50   int bar;
  51
  52  private:
  53   X(const X&);
  54   X& operator=(const X&);
  55 };
  56
  57 int seventeen() { return 17; }
  58
  59 struct get_seventeen
  60 {
  61   typedef int result_type;
  62   int operator()() const { return 17; }
  63 };
  64
  65 void test01()
  66 {
  67   using std::ref;
  68   using std::cref;
  69
  70   ::get_seventeen get_sev;
  71   ::X x;
  72
  73   const float pi = 3.14;
  74
  75   // Functions
  76   VERIFY(ref(truncate_float)(pi) == 3);
  77   VERIFY(ref(seventeen)() == 17);
  78
  79   // Function pointers
  80   VERIFY(cref(&truncate_float)(pi) == 3);
  81   VERIFY(cref(&seventeen)() == 17);
  82
  83   // Function objects
  84   VERIFY(ref(get_sev)() == 17);
  85   VERIFY(cref(get_sev)() == 17);
  86   VERIFY(ref(x)(pi) == 4);
  87   VERIFY(cref(x)(pi) == 5);
  88 }
  89
  90 int main()
  91 {
  92   test01();
  93   return 0;
  94 }