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

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2008-2024 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 // C++11 20.8.3.4 reference_wrapper invocation [refwrap.invoke]
  21
  22 #include <functional>
  23 #include <type_traits>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_tr1.h>
  26
  27 using namespace __gnu_test;
  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   int foo_varargs(float x, ...)      { return truncate_float(x); }
  40
  41   int operator()(float x)
  42   {
  43     return foo(x) + 1;
  44   }
  45
  46   int operator()(float x) const
  47   {
  48     return foo_c(x) + 2;
  49   }
  50
  51   int bar;
  52
  53  private:
  54   X(const X&);
  55   X& operator=(const X&);
  56 };
  57
  58 int seventeen() { return 17; }
  59
  60 struct get_seventeen
  61 {
  62   typedef int result_type;
  63   int operator()() const { return 17; }
  64 };
  65
  66 void test01()
  67 {
  68   using std::ref;
  69   using std::cref;
  70
  71   ::get_seventeen get_sev;
  72   ::X x;
  73   ::X* xp = &x;
  74   int (::X::* p_foo)(float) = &::X::foo;
  75   int (::X::* p_foo_c)(float) const = &::X::foo_c;
  76   int (::X::* p_foo_v)(float) volatile = &::X::foo_v;
  77   int (::X::* p_foo_cv)(float) const volatile = &::X::foo_cv;
  78   int (::X::* p_foo_varargs)(float, ...) = &::X::foo_varargs;
  79   int ::X::* p_bar = &::X::bar;
  80
  81   const float pi = 3.14;
  82
  83   // Functions
  84   VERIFY(ref(truncate_float)(pi) == 3);
  85   VERIFY(ref(seventeen)() == 17);
  86
  87   // Function pointers
  88   VERIFY(cref(truncate_float)(pi) == 3);
  89   VERIFY(cref(seventeen)() == 17);
  90
  91   // Member function pointers
  92   VERIFY(ref(p_foo)(x, pi) == 3);
  93   VERIFY(ref(p_foo)(xp, pi) == 3);
  94   VERIFY(ref(p_foo_c)(x, pi) == 3);
  95   VERIFY(ref(p_foo_c)(xp, pi) == 3);
  96   VERIFY(ref(p_foo_v)(x, pi) == 3);
  97   VERIFY(ref(p_foo_v)(xp, pi) == 3);
  98   VERIFY(ref(p_foo_cv)(x, pi) == 3);
  99   VERIFY(ref(p_foo_cv)(xp, pi) == 3);
 100   VERIFY(ref(p_foo_varargs)(x, pi) == 3);
 101   VERIFY(ref(p_foo_varargs)(xp, pi, 1, 1) == 3);
 102   VERIFY(ref(p_foo_varargs)(x, pi, 1, 1) == 3);
 103   VERIFY(ref(p_foo_varargs)(xp, pi) == 3);
 104
 105   // Member data pointers
 106   VERIFY(ref(p_bar)(x) == 17);
 107   VERIFY(ref(p_bar)(xp) == 17);
 108
 109   // Function objects
 110   VERIFY(ref(get_sev)() == 17);
 111   VERIFY(cref(get_sev)() == 17);
 112   VERIFY(ref(x)(pi) == 4);
 113   VERIFY(cref(x)(pi) == 5);
 114 }
 115
 116 int main()
 117 {
 118   test01();
 119   return 0;
 120 }