static-counter.h

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#ifndef STATIC_COUNTER_H_INCLUDED
#define STATIC_COUNTER_H_INCLUDED
/**********************************************************************/
/*
 * Copyright (c) 2014-2015, Jetro AS
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONRIBUTORS ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the EVE platform.
 */

/**
 * \file
 * @brief A part of TOC table compile-time generator
 *
 * @author DT, Jetro AS
 */ /******************************************************************/

#include "int2type.h"

template <class T, class U>
class CStaticCounter
 : public CStaticCounter<IntToType<T::value - 1>, U>
{};

template<class U>                 \
class CStaticCounter<IntToType<0>, U> \
{ unsigned char space; };

#define DEF_STATIC_COUNTER_EX(type, line)           \
  class CStaticCounterType_ ## type;\
  template<>                 \
  class CStaticCounter<IntToType<line>, CStaticCounterType_ ## type> \
  { unsigned char space; }

#define DEF_STATIC_COUNTER(type) \
  DEF_STATIC_COUNTER_EX(type, __LINE__)

#define INC_STATIC_COUNTER_EX(type, line)           \
  template<>                        \
  class CStaticCounter<IntToType<line>, CStaticCounterType_ ## type> \
  { unsigned char space[GET_STATIC_COUNTER(type) + 2]; }

#define INC_STATIC_COUNTER(type)           \
  INC_STATIC_COUNTER_EX(type, __LINE__)

#define ADD_STATIC_COUNTER_EX(type, val, line)      \
  template<>                        \
  class CStaticCounter<IntToType<line>, CStaticCounterType_ ## type> \
  { unsigned char space[GET_STATIC_COUNTER(type) + 1 + (val)]; }

#define ADD_STATIC_COUNTER(type, val)      \
   ADD_STATIC_COUNTER_EX(type, val, __LINE__)

#define SET_STATIC_COUNTER_EX(type, val, line)      \
  template<>                        \
  class CStaticCounter<IntToType<line>, CStaticCounterType_ ## type> \
  { unsigned char space[1 + (val)]; }

#define SET_STATIC_COUNTER(type, val)      \
  SET_STATIC_COUNTER_EX(type, val, __LINE__)

#define GET_STATIC_COUNTER_EX(type, line)         \
  (sizeof(CStaticCounter<IntToType<line - 1>, CStaticCounterType_ ## type>) - 1)

#define GET_STATIC_COUNTER(type) \
  GET_STATIC_COUNTER_EX(type, __LINE__)

#if 0
// Usage:
DEF_STATIC_COUNTER(test);
static const int cnt0 = GET_STATIC_COUNTER(test); // -> 0
INC_STATIC_COUNTER(test);
static const int cnt1 = GET_STATIC_COUNTER(test); // -> 1
INC_STATIC_COUNTER(test);
INC_STATIC_COUNTER(test);
static const int cnt2 = GET_STATIC_COUNTER(test); // -> 3
ADD_STATIC_COUNTER(test, -1);
static const int cnt3 = GET_STATIC_COUNTER(test); // -> 2
SET_STATIC_COUNTER(test, 4);
static const int cnt4 = GET_STATIC_COUNTER(test); // -> 4
#endif

#endif /* STATIC_COUNTER_H_INCLUDED */