src/Util/DebugFlag.hpp

   1 /*
   2  * Copyright (C) 2011 Max Kellermann <max@duempel.org>
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the
  14  * distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  19  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  20  * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  27  * OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #ifndef XCSOAR_UTIL_DEBUG_FLAG_HPP
  31 #define XCSOAR_UTIL_DEBUG_FLAG_HPP
  32
  33 /**
  34  * A flag that is only available in the debug build (#ifndef NDEBUG).
  35  * It is initialised to false.  In the release build, this type
  36  * disappears without any overhead.
  37  */
  38 struct DebugFlag {
  39 #ifdef NDEBUG
  40   DebugFlag() = default;
  41
  42   constexpr
  43   DebugFlag(bool _value) {}
  44 #else
  45   bool value;
  46
  47   constexpr
  48   DebugFlag():value(false) {}
  49
  50   constexpr
  51   DebugFlag(bool _value):value(_value) {}
  52
  53   operator bool() const {
  54     return value;
  55   }
  56 #endif
  57
  58   DebugFlag &operator=(bool _value) {
  59 #ifndef NDEBUG
  60     value = _value;
  61 #endif
  62     return *this;
  63   }
  64 };
  65
  66 #endif