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base/checked_cast.hpp
43 строки
2 KB
Arsentiy Milchakov
[map] infrastructure for elevation info is added. review fixes
04 мар 2020, 15:51
04 мар 2020, 15:51
4683f80
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#pragma once #include "base/assert.hpp" #include <limits> #include <type_traits> namespace base { template <typename ReturnType, typename ParameterType> ReturnType checked_cast(ParameterType v) { static_assert(std::is_integral<ParameterType>::value, "ParameterType should be integral"); static_assert(std::is_integral<ReturnType>::value, "ReturnType should be integral"); ReturnType const result = static_cast<ReturnType>(v); CHECK_EQUAL(static_cast<ParameterType>(result), v, ()); CHECK((result > 0) == (v > 0), ("checked_cast failed, value =", v, ", result =", result)); return result; } template <typename ReturnType, typename ParameterType> ReturnType asserted_cast(ParameterType v) { static_assert(std::is_integral<ParameterType>::value, "ParameterType should be integral"); static_assert(std::is_integral<ReturnType>::value, "ReturnType should be integral"); ReturnType const result = static_cast<ReturnType>(v); ASSERT_EQUAL(static_cast<ParameterType>(result), v, ()); ASSERT((result > 0) == (v > 0), ("asserted_cast failed, value =", v, ", result =", result)); return result; } template <typename ResultType, typename ParameterType> bool IsCastValid(ParameterType v) { static_assert(std::is_integral<ParameterType>::value, "ParameterType should be integral"); static_assert(std::is_integral<ResultType>::value, "ReturnType should be integral"); auto const result = static_cast<ResultType>(v); return static_cast<ParameterType>(result) == v && ((result > 0) == (v > 0)); } } // namespace base