C++ iterate or split UTF-8 string into array of symbols?

If I understand correctly, it sounds like you want to find the start of each UTF-8 character. If so, then it would be fairly straightforward to parse them (interpreting them is a different matter). But the definition of how many octets are involved is well-defined by the RFC:

Char. number range  |        UTF-8 octet sequence   (hexadecimal)    |              (binary)--------------------+---------------------------------------------0000 0000-0000 007F | 0xxxxxxx0000 0080-0000 07FF | 110xxxxx 10xxxxxx0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

For example, if lb has the first octet of a UTF-8 character, I think the following would determine the number of octets involved.

unsigned char lb;if (( lb & 0x80 ) == 0 )          // lead bit is zero, must be a single ascii   printf( "1 octet\n" );else if (( lb & 0xE0 ) == 0xC0 )  // 110x xxxx   printf( "2 octets\n" );else if (( lb & 0xF0 ) == 0xE0 ) // 1110 xxxx   printf( "3 octets\n" );else if (( lb & 0xF8 ) == 0xF0 ) // 1111 0xxx   printf( "4 octets\n" );else   printf( "Unrecognized lead byte (%02x)\n", lb );

Ultimately, though, you are going to be much better off using an existing library as suggested in another post. The above code might categorize the characters according to octets, but it doesn't help "do" anything with them once that is finished.

Solved using tiny platform-independent UTF8 CPP library:

    char* str = (char*)text.c_str();    // utf-8 string    char* str_i = str;                  // string iterator    char* end = str+strlen(str)+1;      // end iterator    do    {        uint32_t code = utf8::next(str_i, end); // get 32 bit code of a utf-8 symbol        if (code == 0)            continue;        unsigned char[5] symbol = {0};        utf8::append(code, symbol); // copy code to symbol        // ... do something with symbol    }    while ( str_i < end );

UTF8 CPP is exactly what you want