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c++char32-t

is<thing> equivalents for char32_t

Are there any equivalents for the char functions (ispace, isalpha, etc) defined in <ctype> for char32_t?

I had a look around & could only see iswspace (& related) which seem like those are for 16bit chars.

Note: while isspace takes a int as a parameter it seems to produce erroneous results for Unicode characters.

Example:

char32_t dagger = U'🗡';
if (isspace(dagger)) {
    puts("That is a space!");
}

Will output "That is a space!"

Solution

  • Up to wchar_t you can use std::isalpha with the suitable locale defined in in <locale>.

    For anything above 0xFFFF you will need the ICU library:

    u_isalpha or u_isUAlphabetic

    u_isspace or u_isUWhiteSpace

    Full list of functions: uchar.h