libstdc++-v3/testsuite/25_algorithms/sort/78991.cc

   1 // Copyright (C) 2017-2020 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 compile { target c++14 } }
  19
  20 // PR 78991
  21 // This failed to compile with Clang because the result_of expression causes
  22 // instantiation of _Iter_comp_iter::operator() outside the immediate context.
  23
  24 #include <algorithm>
  25
  26 struct function
  27 {
  28   function() = default;
  29
  30   template<typename F, typename = std::result_of_t<F&(int, int)>>
  31     function(F) { }
  32
  33   bool operator()(int x, int y) const { return x < y; }
  34 };
  35
  36 int main()
  37 {
  38   int a[2]{ 2, 1 };
  39   std::sort(a, a+2, function{});
  40 }