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44 lines
1.5 KiB
C++
44 lines
1.5 KiB
C++
#pragma once
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#include "base/assert.hpp"
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#include <limits>
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#include <type_traits>
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namespace base
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{
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template <typename ReturnType, typename ParameterType>
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ReturnType checked_cast(ParameterType v)
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{
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static_assert(std::is_integral_v<ParameterType>, "ParameterType should be integral");
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static_assert(std::is_integral_v<ReturnType>, "ReturnType should be integral");
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auto const result = static_cast<ReturnType>(v);
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CHECK_EQUAL(static_cast<ParameterType>(result), v, ());
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CHECK((result > 0) == (v > 0), ("checked_cast failed, value =", v, ", result =", result));
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return result;
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}
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template <typename ReturnType, typename ParameterType>
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ReturnType asserted_cast(ParameterType v)
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{
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static_assert(std::is_integral_v<ParameterType>, "ParameterType should be integral");
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static_assert(std::is_integral_v<ReturnType>, "ReturnType should be integral");
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auto const result = static_cast<ReturnType>(v);
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ASSERT_EQUAL(static_cast<ParameterType>(result), v, ());
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ASSERT((result > 0) == (v > 0), ("asserted_cast failed, value =", v, ", result =", result));
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return result;
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}
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template <typename ResultType, typename ParameterType>
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bool IsCastValid(ParameterType v)
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{
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static_assert(std::is_integral_v<ParameterType>, "ParameterType should be integral");
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static_assert(std::is_integral_v<ResultType>, "ReturnType should be integral");
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auto const result = static_cast<ResultType>(v);
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return static_cast<ParameterType>(result) == v && ((result > 0) == (v > 0));
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}
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} // namespace base
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