53 lines
735 B
C++
53 lines
735 B
C++
#ifndef OPP_BOUNDINT_H
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#define OPP_BOUNDINT_H
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namespace opp {
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template<int tmin, int tmax>
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constexpr auto boundinttype(void)
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{
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if constexpr (tmin >= 0 && tmax <= 255)
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return (char)0;
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else if constexpr (tmin >= -128 && tmax <= 127)
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return (signed char)0;
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else
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return (int)0;
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}
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template<int tmin, int tmax>
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class boundint
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{
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protected:
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decltype(boundinttype<tmin, tmax>()) v;
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public:
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boundint(int i)
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: v(i)
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{
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}
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void operator=(int k)
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{
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__assume(k >= tmin && k <= tmax);
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v = k;
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}
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void operator+=(int k)
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{
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k += v;
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__assume(k >= tmin && k <= tmax);
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v = k;
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}
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operator int() const
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{
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int k = v;
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__assume(k >= tmin && k <= tmax);
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return k;
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}
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};
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}
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#endif
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