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mdbx++: clarify comments for mdbx::byte and char8_t usage.

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Related to https://github.com/erthink/libmdbx/issues/263.
This commit is contained in:
Leonid Yuriev 2022-01-21 14:19:08 +03:00
parent 75b23524bd
commit 03381fa469
1 changed files with 7 additions and 3 deletions
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10
mdbx.h++
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@ -251,11 +251,15 @@ namespace mdbx {
// Functions whose signature depends on the `mdbx::byte` type // Functions whose signature depends on the `mdbx::byte` type
// must be strictly defined as inline! // must be strictly defined as inline!
#if defined(DOXYGEN) || (defined(__cpp_char8_t) && __cpp_char8_t >= 201811) #if defined(DOXYGEN) || (defined(__cpp_char8_t) && __cpp_char8_t >= 201811)
// Wanna using a non-aliasing type to release more power of an optimizer. // To enable all kinds of an compiler optimizations we use a byte-like type
// that don't presumes aliases for pointers as does the `char` type and its
// derivatives/typedefs.
// Please see https://github.com/erthink/libmdbx/issues/263
// for reasoning of the use of `char8_t` type and switching to `__restrict__`.
using byte = char8_t; using byte = char8_t;
#else #else
// Wanna not using std::byte since it doesn't add features, // Avoid `std::byte` since it doesn't add features but inconvenient
// but add inconvenient restrictions. // restrictions.
using byte = unsigned char; using byte = unsigned char;
#endif /* __cpp_char8_t >= 201811*/ #endif /* __cpp_char8_t >= 201811*/