ClickHouse/base/common/bit_cast.h

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2021-06-15 19:55:21 +00:00
#pragma once
#include <string.h>
#include <algorithm>
#include <type_traits>
/** \brief Returns value `from` converted to type `To` while retaining bit representation.
* `To` and `From` must satisfy `CopyConstructible`.
*/
template <typename To, typename From>
std::decay_t<To> bit_cast(const From & from)
{
To res {};
memcpy(static_cast<void*>(&res), &from, std::min(sizeof(res), sizeof(from)));
return res;
}
/** \brief Returns value `from` converted to type `To` while retaining bit representation.
* `To` and `From` must satisfy `CopyConstructible`.
*/
template <typename To, typename From>
std::decay_t<To> safe_bit_cast(const From & from)
{
static_assert(sizeof(To) == sizeof(From), "bit cast on types of different width");
return bit_cast<To, From>(from);
}