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Difference between revisions of "cpp/string/wide/iswprint"

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< cpp‎ | string‎ | wide
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{{cpp/title|iswprint}}
 
{{cpp/title|iswprint}}
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{{cpp/string/wide/sidebar}}
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{{cpp/string/wide/navbar}}
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{{ddcl | header=cwctype |
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{{ddcl|header=cwctype|
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int iswcntrl( wint_t ch );
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int iswprint( std::wint_t ch );
 
}}
 
}}
  
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Checks if the given wide character can be printed, i. e. it is either a number ({{tt|0123456789}}), an uppercase letter ({{tt|ABCDEFGHIJKLMNOPQRSTUVWXYZ}}), a lowercase letter ({{tt|abcdefghijklmnopqrstuvwxyz}}), a punctuation character({{tt|!"#$%&'()*+,-./:;<{{=}}>?@[\]^_`{<nowiki></nowiki>{{!}}<nowiki></nowiki>}~}}), space or any printable character specific to the current locale.
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Checks if the given wide character can be printed, i.e. it is either a number ({{tt|0123456789}}), an uppercase letter ({{tt|ABCDEFGHIJKLMNOPQRSTUVWXYZ}}), a lowercase letter ({{tt|abcdefghijklmnopqrstuvwxyz}}), a punctuation character ({{tt|<nowiki>!"#$%&'()*+,-./:;<=>?@[\]^_`{!}~</nowiki>}}), space or any printable character specific to the current C locale.
  
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<!-- ======== -->
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{{cpp/string/wide/wint_t args}}
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{{params}}
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{{param list begin}}
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{{param list item | ch | wide character}}
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{{param list end}}
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<!-- ======== -->
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===Parameters===
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{{returns}}
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{{par begin}}
 +
{{par|ch|wide character}}
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{{par end}}
  
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non-zero value ({{cpp|true}}) if the wide character can be printed, {{tt|0}} ({{cpp|false}}) otherwise.
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===Return value===
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Non-zero value if the wide character can be printed, zero otherwise.
  
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<!-- ======== -->
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===Notes===
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{{see also}}
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[https://www.open-std.org/JTC1/SC35/WG5/docs/30112d10.pdf ISO 30112] specifies which Unicode characters are include in POSIX print category.
 +
 
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===Example===
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{{example
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|code=
 +
#include <clocale>
 +
#include <cwctype>
 +
#include <iostream>
 +
 
 +
void demo_iswprint(std::string_view rem, const std::wint_t c)
 +
{
 +
    std::cout << std::boolalpha << std::hex << std::showbase
 +
              << rem << "iswprint('" << c << "') = "
 +
              << !!std::iswprint(c) << '\n';
 +
}
 +
 
 +
int main()
 +
{
 +
    const wchar_t c1 = L'\u2002'; // en-space
 +
    const wchar_t c2 = L'\u0082'; // break permitted
 +
 
 +
    demo_iswprint("In default locale:\n", c1);
 +
 
 +
    std::setlocale(LC_ALL, "en_US.utf8");
 +
    demo_iswprint("In Unicode locale:\n", c1);
 +
    demo_iswprint("", c2);
 +
}
 +
|p=true
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|output=
 +
In default locale:
 +
iswprint('0x2002') = false
 +
In Unicode locale:
 +
iswprint('0x2002') = true
 +
iswprint('0x82') = false
 +
}}
 +
 
 +
===See also===
 +
{{dsc begin}}
 +
{{dsc inc|cpp/locale/dsc isprint}}
 +
{{dsc inc|cpp/string/byte/dsc isprint}}
 +
{{dsc see c|c/string/wide/iswprint}}
 +
{{dsc end}}
 
{{cpp/string/character classes}}
 
{{cpp/string/character classes}}
 +
 +
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 09:25, 15 September 2023

 
C++
 
Strings library
 
Null-terminated wide strings
 
Defined in header <cwctype>
int iswprint( std::wint_t ch );

Checks if the given wide character can be printed, i.e. it is either a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz), a punctuation character (!"#$%&'()*+,-./:;<=>?@[\]^_`{!}~), space or any printable character specific to the current C 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.

Contents

[edit] Parameters

ch - wide character

[edit] Return value

Non-zero value if the wide character can be printed, zero otherwise.

[edit] Notes

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

[edit] Example

Run this code
#include <clocale>
#include <cwctype>
#include <iostream>
 
void demo_iswprint(std::string_view rem, const std::wint_t c)
{
    std::cout << std::boolalpha << std::hex << std::showbase
              << rem << "iswprint('" << c << "') = "
              << !!std::iswprint(c) << '\n';
}
 
int main()
{
    const wchar_t c1 = L'\u2002'; // en-space
    const wchar_t c2 = L'\u0082'; // break permitted
 
    demo_iswprint("In default locale:\n", c1);
 
    std::setlocale(LC_ALL, "en_US.utf8");
    demo_iswprint("In Unicode locale:\n", c1);
    demo_iswprint("", c2);
}

Possible output: 

In default locale:
iswprint('0x2002') = false
In Unicode locale:
iswprint('0x2002') = true
iswprint('0x82') = false

[edit] See also

 checks if a character is classified as printable by a locale
(function template) [edit]
checks if a character is a printing character
(function) [edit]
C documentation for iswprint
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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