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/**
* Copyright (c) 2007-2012, Timothy Stack
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Timothy Stack nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''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 REGENTS OR CONTRIBUTORS 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.
*
* @file strong_int.hh
*/
#ifndef strong_int_hh
#define strong_int_hh
/**
* Template class for "strongly-typed" integers, in other words, integers that
* have different semantic meaning and cannot be easily used in place of one
* another.
*
* @param T The integer type.
* @param DISTINCT An class used solely to distinguish templates that have the
* same integer type.
*/
template<typename T, class DISTINCT>
class strong_int {
public:
explicit constexpr strong_int(T v = 0) noexcept : value(v){};
operator const T&() const
{
return this->value;
};
strong_int operator+(const strong_int& rhs) const
{
return strong_int(this->value + rhs.value);
};
strong_int operator-(const strong_int& rhs) const
{
return strong_int(this->value - rhs.value);
};
strong_int operator/(const strong_int& rhs) const
{
return strong_int(this->value / rhs.value);
};
bool operator<(const strong_int& rhs) const
{
return this->value < rhs.value;
};
strong_int& operator+=(const strong_int& rhs)
{
this->value += rhs.value;
return *this;
};
strong_int& operator-=(const strong_int& rhs)
{
this->value -= rhs.value;
return *this;
};
strong_int& operator-()
{
this->value = -this->value;
return *this;
};
strong_int& operator++()
{
this->value++;
return *this;
};
strong_int& operator--()
{
this->value--;
return *this;
};
bool operator==(const strong_int& rhs) const
{
return this->value == rhs.value;
};
T* out()
{
return &this->value;
};
private:
T value;
};
/**
* Macro that declares a strongly-typed integer and the empty class used as a
* distinguisher.
*
* @param T The integer type.
* @param name The name of the strongly-typed integer.
*/
#define STRONG_INT_TYPE(T, name) \
class __##name##_distinct; \
typedef strong_int<T, __##name##_distinct> name##_t
#endif
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