32 lines
1 KiB
C
32 lines
1 KiB
C
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/*
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* This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>.
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* It is copyright by its individual contributors, as recorded in the
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* project's Git history. See COPYING.txt at the top level for license
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* terms and a link to the Git history.
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*/
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#pragma once
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#include <type_traits>
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/* Convenience function to use std::underlying_type<T> on a given value,
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* and always pick the right T for the enum being converted.
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*/
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template <typename T>
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static constexpr auto underlying_value(const T e)
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{
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if constexpr (std::is_enum<T>::value)
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return static_cast<typename std::underlying_type<T>::type>(e);
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else
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{
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/* This path should never be executed, but has a return
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* statement because deducing a return type of `void` produces
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* worse error messages than deducing a passthrough of the
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* original value. Although this function can work correctly on
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* a non-enum, it is unnecessary there, so any such use likely
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* indicates a bug.
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*/
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static_assert(std::is_enum<T>::value);
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return e;
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}
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}
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