libstdc++-v3/testsuite/experimental/tuple/apply.cc

   1 // Copyright (C) 2014-2022 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do run { target c++14 } }
  19
  20 #include <experimental/tuple>
  21 #include <testsuite_hooks.h>
  22
  23 void
  24 test01()
  25 {
  26   auto t = std::make_tuple(1, '2', 3.0);
  27   std::experimental::apply( [&](int& i, char& c, double& d) {
  28       VERIFY(&i == &std::get<int>(t));
  29       VERIFY(&c == &std::get<char>(t));
  30       VERIFY(&d == &std::get<double>(t));
  31     }, t);
  32 }
  33
  34 constexpr int func(int i, int j) { return i + j; }
  35
  36 void
  37 test02()
  38 {
  39   constexpr auto t = std::make_tuple(1, 2);
  40   constexpr int i = std::experimental::apply(func, t);
  41   VERIFY( i == 3 );
  42 }
  43
  44 struct F
  45 {
  46   int f(int i, int j) const { return i + j; }
  47 };
  48
  49 void
  50 test03()
  51 {
  52   auto t = std::make_tuple(F{}, 1, 2);
  53   int r = std::experimental::apply(&F::f, t);
  54   VERIFY( r == 3 );
  55 }
  56
  57 int
  58 main()
  59 {
  60   test01();
  61   test02();
  62   test03();
  63 }