Program Listing for File bit_cast.hpp

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#pragma once
#ifndef UITSL_POLYFILL_IMPL_BIT_CAST_HPP_INCLUDE
#define UITSL_POLYFILL_IMPL_BIT_CAST_HPP_INCLUDE

#include <cstring>
#include <type_traits>

namespace std {

  // Adapted from https://en.cppreference.com/w/cpp/numeric/bit_cast
  template <class To, class From>
  typename std::enable_if_t<
    sizeof(To) == sizeof(From) &&
    std::is_trivially_copyable_v<From> &&
    std::is_trivially_copyable_v<To>,
    To>
  // constexpr support needs compiler magic
  bit_cast(const From& src) noexcept {
    static_assert(
      std::is_trivially_constructible_v<To>,
      "This implementation additionally requires destination type to be trivially constructible"
    );
    To dst;
    std::memcpy(&dst, &src, sizeof(To));
    return dst;
  }

} // namespace std

#endif // #ifndef UITSL_POLYFILL_IMPL_BIT_CAST_HPP_INCLUDE