libcxx/test/support/tracked_value.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 #ifndef SUPPORT_TRACKED_VALUE_H
   9 #define SUPPORT_TRACKED_VALUE_H
  10
  11 #include <cassert>
  12
  13 #include "test_macros.h"
  14
  15 struct TrackedValue {
  16     enum State { CONSTRUCTED, MOVED_FROM, DESTROYED };
  17     State state;
  18
  19     TrackedValue() : state(State::CONSTRUCTED) {}
  20
  21     TrackedValue(TrackedValue const& t) : state(State::CONSTRUCTED) {
  22         assert(t.state != State::MOVED_FROM && "copying a moved-from object");
  23         assert(t.state != State::DESTROYED  && "copying a destroyed object");
  24     }
  25
  26 #if TEST_STD_VER >= 11
  27     TrackedValue(TrackedValue&& t) : state(State::CONSTRUCTED) {
  28         assert(t.state != State::MOVED_FROM && "double moving from an object");
  29         assert(t.state != State::DESTROYED  && "moving from a destroyed object");
  30         t.state = State::MOVED_FROM;
  31     }
  32 #endif
  33
  34     TrackedValue& operator=(TrackedValue const& t) {
  35         assert(state != State::DESTROYED && "copy assigning into destroyed object");
  36         assert(t.state != State::MOVED_FROM && "copying a moved-from object");
  37         assert(t.state != State::DESTROYED  && "copying a destroyed object");
  38         state = t.state;
  39         return *this;
  40     }
  41
  42 #if TEST_STD_VER >= 11
  43     TrackedValue& operator=(TrackedValue&& t) {
  44         assert(state != State::DESTROYED && "move assigning into destroyed object");
  45         assert(t.state != State::MOVED_FROM && "double moving from an object");
  46         assert(t.state != State::DESTROYED  && "moving from a destroyed object");
  47         state = t.state;
  48         t.state = State::MOVED_FROM;
  49         return *this;
  50     }
  51 #endif
  52
  53     ~TrackedValue() {
  54         assert(state != State::DESTROYED && "double-destroying an object");
  55         state = State::DESTROYED;
  56     }
  57 };
  58
  59 #endif // SUPPORT_TRACKED_VALUE_H