Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Obtains the size of the first character of a string.
std::size_t(* next_char;
Given a range of bytes, r,
this function must interpret r
as a string encoded using this character set, and return the number of
bytes that the first character in the string spans, or 0 in case of error.
r is guaranteed to be non-empty
(r.size() > 0).
In some character sets (like UTF-8), not all byte sequences represent valid characters. If this function finds an invalid byte sequence while trying to interpret the first character, it should return 0 to signal the error.
This function must not throw exceptions or have side effects.
The function signature should be: std::size_t (*next_char)(boost::span<const unsigned char> r).