martinmoene / byte-lite Goto Github PK
View Code? Open in Web Editor NEWbyte lite - A C++17-like byte type for C++98, C++11 and later in a single-file header-only library
License: Boost Software License 1.0
byte lite - A C++17-like byte type for C++98, C++11 and later in a single-file header-only library
License: Boost Software License 1.0
Hi, byte-lite appears to fail the tests in a big-endian configuration.
For context, it was an automated build having the s390x architecture enabled.
/builddir/build/BUILD/byte-lite-0.3.0/test/byte.t.cpp:193: failed:
byte: Allows strict aliasing: 14 == F::f( i, reinterpret_cast<nonstd::byte&>( i ) ) for 14 == 7
As Richard Smith points out in https://groups.google.com/a/isocpp.org/d/msg/std-proposals/McSXSFki08I/fwKKfZqNCAAJ, your byte implementation would be unsafe under strict aliasing optimisation.
The solution is to mark up your byte type with __attribute__((__may_alias__))
on GCC and clang, For MSVC, currently, unless you use __declspec(noalias)
and/or __declspec(restrict)
, everything is assumed to alias, though Microsoft promise that strict aliasing optimisation is coming at some point soon.
What's the advantage of this over enum class byte : std::uint8_t {};
or using byte = uint8_t
?
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