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span: Add std::byte helpers

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Also, add Span<std::byte> interface to strencondings.
This commit is contained in:
MarcoFalke
2021-11-04 09:03:04 +01:00
parent fa18038f51
commit faa3ec2304
5 changed files with 56 additions and 11 deletions
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25
src/span.h
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@ -180,6 +180,7 @@ public:
return m_data[m_size - 1];
}
constexpr std::size_t size() const noexcept { return m_size; }
constexpr std::size_t size_bytes() const noexcept { return sizeof(C) * m_size; }
constexpr bool empty() const noexcept { return size() == 0; }
CONSTEXPR_IF_NOT_DEBUG C& operator[](std::size_t pos) const noexcept
{
@ -236,11 +237,35 @@ T& SpanPopBack(Span<T>& span)
return back;
}
// From C++20 as_bytes and as_writeable_bytes
template <typename T>
Span<const std::byte> AsBytes(Span<T> s) noexcept
{
return {reinterpret_cast<const std::byte*>(s.data()), s.size_bytes()};
}
template <typename T>
Span<std::byte> AsWritableBytes(Span<T> s) noexcept
{
return {reinterpret_cast<std::byte*>(s.data()), s.size_bytes()};
}
template <typename V>
Span<const std::byte> MakeByteSpan(V&& v) noexcept
{
return AsBytes(MakeSpan(std::forward<V>(v)));
}
template <typename V>
Span<std::byte> MakeWritableByteSpan(V&& v) noexcept
{
return AsWritableBytes(MakeSpan(std::forward<V>(v)));
}
// Helper functions to safely cast to unsigned char pointers.
inline unsigned char* UCharCast(char* c) { return (unsigned char*)c; }
inline unsigned char* UCharCast(unsigned char* c) { return c; }
inline const unsigned char* UCharCast(const char* c) { return (unsigned char*)c; }
inline const unsigned char* UCharCast(const unsigned char* c) { return c; }
inline const unsigned char* UCharCast(const std::byte* c) { return reinterpret_cast<const unsigned char*>(c); }
// Helper function to safely convert a Span to a Span<[const] unsigned char>.
template <typename T> constexpr auto UCharSpanCast(Span<T> s) -> Span<typename std::remove_pointer<decltype(UCharCast(s.data()))>::type> { return {UCharCast(s.data()), s.size()}; }