std::iswspace

Header: <cwctype>

Checks if the given wide character is a wide whitespace character as classified by the currently installed C locale. In the default locale, the whitespace characters are the following:

# Declarations

int iswspace( wint_t ch );

# Parameters

# Return value

Non-zero value if the wide character is a whitespace character, zero otherwise.

# Notes

ISO 30112 defines POSIX space characters as Unicode characters U+0009..U+000D, U+0020, U+1680, U+180E, U+2000..U+2006, U+2008..U+200A, U+2028, U+2029, U+205F, and U+3000.

# Example

#include <clocale>
#include <cwctype>
#include <iostream>
 
void try_with(wchar_t c, const char* loc)
{
    std::setlocale(LC_ALL, loc);
    std::wcout << "isspace('" << c << "') in " << loc << " locale returned "
               << std::boolalpha << static_cast<bool>(std::iswspace(c)) << '\n';
}
 
int main()
{
    const wchar_t EM_SPACE = L'\u2003'; // Unicode character 'EM SPACE'
    try_with(EM_SPACE, "C");
    try_with(EM_SPACE, "en_US.UTF8");
}

# See also