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https://github.com/bolero-MURAKAMI/Sprout.git
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47 lines
1.7 KiB
C++
47 lines
1.7 KiB
C++
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#ifndef SPROUT_INTEGER_LIMITED_HPP
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#define SPROUT_INTEGER_LIMITED_HPP
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#include <limits>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/arithmetic_promote.hpp>
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namespace sprout {
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namespace limited {
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//
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// plus
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//
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template<typename T, typename U>
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inline SPROUT_CONSTEXPR typename sprout::arithmetic_promote<T, U>::type
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plus(T const& lhs, U const& rhs) {
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typedef typename sprout::arithmetic_promote<T, U>::type type;
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return lhs > 0 && rhs > 0 && std::numeric_limits<type>::max() - lhs < rhs
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? std::numeric_limits<type>::max()
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: lhs < 0 && rhs < 0 && std::numeric_limits<type>::min() - lhs > rhs
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? std::numeric_limits<type>::min()
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: lhs + rhs
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;
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}
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//
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// multiplies
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//
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template<typename T, typename U>
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inline SPROUT_CONSTEXPR typename sprout::arithmetic_promote<T, U>::type
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multiplies(T const& lhs, U const& rhs) {
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typedef typename sprout::arithmetic_promote<T, U>::type type;
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return lhs > 0 && rhs > 0 && std::numeric_limits<type>::max() / lhs + (std::numeric_limits<type>::max() % lhs ? 1 : 0) <= rhs
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? std::numeric_limits<type>::max()
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: lhs > 0 && rhs < 0 && std::numeric_limits<type>::min() / rhs + (std::numeric_limits<type>::min() % rhs ? 1 : 0) <= lhs
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? std::numeric_limits<type>::min()
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: lhs < 0 && rhs > 0 && std::numeric_limits<type>::min() / lhs + (std::numeric_limits<type>::min() % lhs ? 1 : 0) <= rhs
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? std::numeric_limits<type>::min()
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: lhs < 0 && rhs < 0 && -(std::numeric_limits<type>::min() / rhs + (std::numeric_limits<type>::min() % rhs ? 1 : 0)) >= lhs
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? std::numeric_limits<type>::max()
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: lhs * rhs
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;
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}
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} // namespace limited
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} // namespace sprout
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#endif // #ifndef SPROUT_INTEGER_LIMITED_HPP
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