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std::iswcntrl

STD：：iswcntrl

Defined in header ​​
int iswcntrl( std::wint_t ch ​​

检查给定的宽字符是否为控制字符，即代码。0x00-0x1F和0x7F以及特定于当前区域设置的任何控制字符。

参数

ch-wide character

返回值

如果宽字符是控制字符，则为非零值，否则为零。

例

二次

#include <iostream>
#include <cwctype>
#include <clocale>
 
int main()
{
    wchar_t c = L'\u2028'; // the Unicode character "line separator" 
 
    std::cout << std::hex << std::showbase << std::boolalpha;
    std::cout << "in the default locale, iswcntrl(" << (std::wint_t)c << ") = "
              << (bool)std::iswcntrl(c) << '\n';
    std::setlocale(LC_ALL, "en_US.utf8"
    std::cout << "in Unicode locale, iswcntrl(" << (std::wint_t)c << ") = "
              << (bool)std::iswcntrl(c) << '\n';
}

二次

产出：

二次

in the default locale, iswcntrl(0x2028) = false
in Unicode locale, iswcntrl(0x2028) = true

二次

另见

iscntrl(std::locale)checks if a character is classified as a control character by a locale (function template)
iscntrlchecks if a character is a control character (function)

c iswcntrl文件

ASCII values (hex)charactersiscntrl iswcntrl.isprint iswprint.isspace iswspace.isblank iswblank.isgraph iswgraph.ispunct iswpunct.isalnum iswalnum.isalpha iswalpha.isupper iswupper.islower iswlower.isdigit iswdigit.isxdigit iswxdigit.
0 - 80x00-0x08control codes (NUL, etc.)≠00000000000
90x09tab (\t)≠00≠0≠00000000
10 - 130x0A-0x0Dwhitespaces (\n,\v,\f,\r)≠00≠000000000
14 - 310x0E-0x1Fcontrol codes≠00000000000
320x20space0≠0≠0≠00000000
33 - 470x21-0x2F!"#$%&'()*+,-./0≠000≠0≠000000
48 - 570x30-0x3901234567890≠000≠00≠0000≠0
58 - 640x3a-0x40:;<=>?@0≠000≠0≠000000
65 - 700x41-0x46ABCDEF0≠000≠00≠0≠0≠000
71 - 900x47-0x5AGHIJKLMNOPQRSTUVWXYZ0≠000≠00≠0≠0≠000
91 - 960x5B-0x60[]^_` | 0 | ≠0 | 0 | 0 | ≠0 | ≠0 | 0 | 0 | 0 | 0 | 0 | 0 |
97 -1020x61-0x66abcdef0≠000≠00≠0≠00≠00
103-1220x67-0x7Aghijklmnopqrstuvwxyz0≠000≠00≠0≠00≠00
123-1260x7B-0x7E{|}~0≠000≠0≠000000
1270x7Fbackspace character (DEL)≠00000000000

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