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Add MakeUCharSpan, to help constructing Span<[const] unsigned char>

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Based on a suggestion by Russell Yanofsky.
This commit is contained in:
Pieter Wuille 2020-06-18 16:31:08 -07:00
parent 567825049f
commit e63dcc3a67
1 changed files with 12 additions and 0 deletions
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12
src/span.h
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@ -207,4 +207,16 @@ T& SpanPopBack(Span<T>& span)
return back;
}
// 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; }
// 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()}; }
/** Like MakeSpan, but for (const) unsigned char member types only. Only works for (un)signed char containers. */
template <typename V> constexpr auto MakeUCharSpan(V&& v) -> decltype(UCharSpanCast(MakeSpan(std::forward<V>(v)))) { return UCharSpanCast(MakeSpan(std::forward<V>(v))); }
#endif