std:: iswpunct

From cppreference.com
C++
Strings library
Null-terminated wide strings
Defined in header <cwctype>
int iswpunct ( std:: wint_t ch ) ;

Checks if the given wide character is a punctuation character, i.e. it is one of !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~ or any punctuation character specific to the current locale.

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 punctuation character, zero otherwise.

Notes

ISO 30112 specifies which Unicode characters are include in POSIX punct category.

Example

Run this code 
#include <clocale>
#include <cwctype>
#include <iostream>
 
int main()
{
    wchar_t c = L'\u2051'; // Two asterisks ('⁑')
 
    std::cout << std::hex << std::showbase << std::boolalpha
              << "in the default locale, iswpunct("
              << static_cast<std::wint_t>(c) << ") = "
              << static_cast<bool>(std::iswpunct(c)) << '\n';
 
    std::setlocale(LC_ALL, "en_US.utf8");
    std::cout << "in Unicode locale, iswpunct("
              << static_cast<std::wint_t>(c) << ") = "
              << static_cast<bool>(std::iswpunct(c)) << '\n';
}

Output: 

in the default locale, iswpunct(0x2051) = false
in Unicode locale, iswpunct(0x2051) = true

See also

checks if a character is classified as punctuation by a locale
(function template)
checks if a character is a punctuation character
(function)
C documentation for iswpunct
ASCII values characters

iscntrl
iswcntrl

isprint
iswprint

isspace
iswspace

isblank
iswblank

isgraph
iswgraph

ispunct
iswpunct

isalnum
iswalnum

isalpha
iswalpha

isupper
iswupper

islower
iswlower

isdigit
iswdigit

isxdigit
iswxdigit

decimal hexadecimal octal
0–8 \x0 – \x8 \0 – \10 control codes ( NUL , etc.) ≠0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 tab ( \t ) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0
10–13 \xA – \xD \12 – \15 whitespaces ( \n , \v , \f , \r ) ≠0 0 ≠0 0 0 0 0 0 0 0 0 0
14–31 \xE – \x1F \16 – \37 control codes ≠0 0 0 0 0 0 0 0 0 0 0 0
32 \x20 \40 space 0 ≠0 ≠0 ≠0 0 0 0 0 0 0 0 0
33–47 \x21 – \x2F \41 – \57 !"#$%&'()*+,-./ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
48–57 \x30 – \x39 \60 – \71 0123456789 0 ≠0 0 0 ≠0 0 ≠0 0 0 0 ≠0 ≠0
58–64 \x3A – \x40 \72 – \100 :;<=>?@ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
65–70 \x41 – \x46 \101 – \106 ABCDEF 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 ≠0
71–90 \x47 – \x5A \107 – \132 GHIJKLMNOP
QRSTUVWXYZ 		0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 0
91–96 \x5B – \x60 \133 – \140 [\]^_` 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
97–102 \x61 – \x66 \141 – \146 abcdef 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 ≠0
103–122 \x67 – \x7A \147 – \172 ghijklmnop
qrstuvwxyz 		0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0
123–126 \x7B – \x7E \172 – \176 {|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0
127 \x7F \177 backspace character ( DEL ) ≠0 0 0 0 0 0 0 0 0 0 0 0
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