From 64dcb40db139ce1aa79dff16ce863a8d5389199f Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Tue, 7 Mar 2023 19:53:32 -0500
Subject: [PATCH] common: make BitCast constexpr
---
src/common/bit_cast.h | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)
diff --git a/src/common/bit_cast.h b/src/common/bit_cast.h
index 535148b4dc..c6110c5426 100644
--- a/src/common/bit_cast.h
+++ b/src/common/bit_cast.h
@@ -3,19 +3,21 @@
#pragma once
-#include <cstring>
-#include <type_traits>
+#include <version>
+
+#ifdef __cpp_lib_bit_cast
+#include <bit>
+#endif
namespace Common {
template <typename To, typename From>
-[[nodiscard]] std::enable_if_t<sizeof(To) == sizeof(From) && std::is_trivially_copyable_v<From> &&
- std::is_trivially_copyable_v<To>,
- To>
-BitCast(const From& src) noexcept {
- To dst;
- std::memcpy(&dst, &src, sizeof(To));
- return dst;
+constexpr inline To BitCast(const From& from) {
+#ifdef __cpp_lib_bit_cast
+ return std::bit_cast<To>(from);
+#else
+ return __builtin_bit_cast(To, from);
+#endif
}
} // namespace Common