c++ - Convert between signed char & unsigned char representing UTF8 -


i using libxml2 , icu in same project. represent utf8 differently. libxml2 uses unsigned char*, , icu constructors take in plain char* (which on pentium 64-bit equivalent signed char).

question: how convert between two? can use static_cast?

i understand utf8 cares underlying data type @ least 8 bits long. both signed char , unsigned char satisfy this. wondering if there gotcha here? corner cases?

edit: @ compiler's (g++/gentoo) insistence, reinterpret_cast can conversion (without relying on c-style cast). let's have 2 unsigned char strings: 0000 , 1000. conversion turn them both 0. possible under utf8?

some libraries use char storing utf-8, others use unsigned char.

in case may need cast between char* , unsigned char* using reinterpret_cast, since these types have same storage unit size , alignment. e.g.:

char const* s = ...; unsigned char const* p = reinterpret_cast<unsigned char const*>(s);

static_cast can simulate reinterpret_cast through intermediate conversion void*, e.g. char* -> void* -> unsigned char*, e.g.:

char const* s = ...; void const* intermediate = s; unsigned char const* p = static_cast<unsigned char const*>(intermediate);

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