libcxx/test/support/operator_hijacker.h

   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 #ifndef SUPPORT_OPERATOR_HIJACKER_H
  10 #define SUPPORT_OPERATOR_HIJACKER_H
  11
  12 #include <cstddef>
  13 #include <functional>
  14
  15 #include "test_macros.h"
  16
  17 /// Helper struct to test ADL-hijacking in containers.
  18 ///
  19 /// The class has some additional operations to be usable in all containers.
  20 struct operator_hijacker {
  21   bool operator<(const operator_hijacker&) const { return true; }
  22   bool operator==(const operator_hijacker&) const { return true; }
  23
  24   template <typename T>
  25   friend void operator&(T&&) = delete;
  26   template <class T, class U>
  27   friend void operator,(T&&, U&&) = delete;
  28   template <class T, class U>
  29   friend void operator&&(T&&, U&&) = delete;
  30   template <class T, class U>
  31   friend void operator||(T&&, U&&) = delete;
  32 };
  33
  34 static_assert(std::is_trivially_copyable<operator_hijacker>::value &&     //
  35                   std::is_copy_constructible<operator_hijacker>::value && //
  36                   std::is_move_constructible<operator_hijacker>::value && //
  37                   std::is_copy_assignable<operator_hijacker>::value &&    //
  38                   std::is_move_assignable<operator_hijacker>::value,      //
  39               "does not satisfy the requirements for atomic<operator_hijacker>");
  40
  41 template <>
  42 struct std::hash<operator_hijacker> {
  43   std::size_t operator()(const operator_hijacker&) const { return 0; }
  44 };
  45
  46 #endif // SUPPORT_OPERATOR_HIJACKER_H