libcxx/test/std/containers/associative/set/set.cons/compare_copy_constructible.compile.fail.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <set>
  10
  11 // Check that std::set fails to instantiate if the comparison predicate is
  12 // not copy-constructible. This is LWG issue 2436
  13
  14 #include <set>
  15
  16 template <class T>
  17 struct Comp {
  18     bool operator () (const T& lhs, const T& rhs) const { return lhs < rhs; }
  19
  20     Comp () {}
  21 private:
  22     Comp (const Comp &); // declared but not defined
  23     };
  24
  25
  26 int main(int, char**) {
  27     std::set<int, Comp<int> > m;
  28
  29   return 0;
  30 }