std::iswspace
From cppreference.com
| Defined in header <cwctype>
|
||
int iswspace( wint_t ch );
|
||
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:
- Space (
0x20,' ') - Form feed (
0x0c,'\f') - Line feed (
0x0a,'\n') - Carriage return (
0x0d,'\r') - Horizontal tab (
0x09,'\t') - Vertical tab (
0x0b,'\v').
If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined.
Parameters
| ch | - | wide character |
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
Demonstrates the use of iswspace with different locales.
Run this code
#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");
}
Output:
isspace(' ') in C locale returned false
isspace(' ') in en_US.UTF8 locale returned true
See also
| checks if a character is classified as whitespace by a locale (function template) | |
| checks if a character is a space character (function) | |
C documentation for iswspace
| |