libstdc++-v3/testsuite/26_numerics/reduce/2.cc

   1 // { dg-options "-std=gnu++17" }
   2 // { dg-do compile { target c++17 } }
   3
   4 // Copyright (C) 2019-2020 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // C++17 29.8.3 [reduce]
  22
  23 #include <numeric>
  24 #include <iterator>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_iterators.h>
  27
  28 struct T
  29 {
  30   T(int);
  31   T(T&&); // MoveConstructible
  32   T& operator=(T&&); // not required by the standard, but it needs to be
  33   T operator+(const T&) const;
  34 };
  35
  36 void
  37 test01()
  38 {
  39   T t[1]{1};
  40   std::reduce(t, t+1, T(0));
  41
  42   using __gnu_test::test_container;
  43   using __gnu_test::input_iterator_wrapper;
  44   test_container<T, input_iterator_wrapper> con(t);
  45   std::reduce(con.begin(), con.end(), T(0));
  46 }
  47
  48 struct Op
  49 {
  50   T operator()(T&, T&) const&;
  51
  52   // The standard does *not* require invoking as an rvalue to be supported.
  53   T operator()(T&, T&) && = delete;
  54
  55   // The standard does *not* require rvalue arguments to be supported
  56   // (this is almost certainly a defect and should be allowed).
  57   T operator()(T&&, T&&) const = delete;
  58 };
  59
  60 void
  61 test02()
  62 {
  63   T t[1]{1};
  64   std::reduce(t, t+1, T(0), Op());
  65
  66   using __gnu_test::test_container;
  67   using __gnu_test::input_iterator_wrapper;
  68   test_container<T, input_iterator_wrapper> con(t);
  69   std::reduce(con.begin(), con.end(), T(0), Op());
  70 }