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113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
/**
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* Copyright (c) 2007-2012, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file strong_int.hh
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*/
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#ifndef strong_int_hh
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#define strong_int_hh
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/**
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* Template class for "strongly-typed" integers, in other words, integers that
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* have different semantic meaning and cannot be easily used in place of one
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* another.
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*
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* @param T The integer type.
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* @param DISTINCT An class used solely to distinguish templates that have the
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* same integer type.
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*/
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template<typename T, class DISTINCT>
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class strong_int {
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public:
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explicit constexpr strong_int(T v = 0) noexcept : value(v){};
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operator const T&() const { return this->value; }
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strong_int operator+(const strong_int& rhs) const
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{
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return strong_int(this->value + rhs.value);
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}
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strong_int operator-(const strong_int& rhs) const
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{
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return strong_int(this->value - rhs.value);
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}
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strong_int operator/(const strong_int& rhs) const
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{
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return strong_int(this->value / rhs.value);
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}
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bool operator<(const strong_int& rhs) const
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{
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return this->value < rhs.value;
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}
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strong_int& operator+=(const strong_int& rhs)
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{
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this->value += rhs.value;
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return *this;
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}
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strong_int& operator-=(const strong_int& rhs)
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{
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this->value -= rhs.value;
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return *this;
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}
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strong_int& operator-()
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{
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this->value = -this->value;
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return *this;
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}
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strong_int& operator++()
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{
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this->value++;
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return *this;
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}
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strong_int& operator--()
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{
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this->value--;
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return *this;
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}
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bool operator==(const strong_int& rhs) const
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{
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return this->value == rhs.value;
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}
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T* out() { return &this->value; }
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T& lvalue() { return this->value; }
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private:
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T value;
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};
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/**
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* Macro that declares a strongly-typed integer and the empty class used as a
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* distinguisher.
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*
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* @param T The integer type.
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* @param name The name of the strongly-typed integer.
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*/
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#define STRONG_INT_TYPE(T, name) \
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class __##name##_distinct; \
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typedef strong_int<T, __##name##_distinct> name##_t
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#endif
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