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62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
/**
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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 strong_int(T v = 0) : value(v) { };
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operator const T & () const { return this->value; };
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strong_int operator+(const strong_int &rhs) {
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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) {
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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) {
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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) {
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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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this->value -= rhs.value;
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return *this;
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};
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strong_int &operator-(void) {
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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++(void) { this->value++; return *this; };
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strong_int &operator--(void) { this->value--; return *this; };
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T *out(void) { 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<int, __##name##_distinct> name##_t
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#endif
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