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Difference between revisions of "cpp/locale/isprint"

From cppreference.com
< cpp‎ | locale
m (copypaste error)
m (+is, fmt)
 
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{{cpp/title | isprint{{small|(std::locale)}}}}
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{{cpp/title|isprint{{small|(std::locale)}}}}
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{{cpp/locale/sidebar}}
+
{{cpp/locale/navbar}}
−
 
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{{ddcl|header=locale|
−
{{ddcl | header=locale |
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template< class CharT >
−
template< class charT >
+
bool isprint( CharT ch, const locale& loc );
−
bool isprint( charT ch, const locale& loc );
+
 
}}
 
}}
  
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Checks if the given character classified as a printable character (including space) by the given locale's {{cpp|std::ctype}} facet.
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Checks if the given character is classified as a printable character (including space) by the given locale's {{lc|std::ctype}} facet.
  
 
===Parameters===
 
===Parameters===
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{{param list begin}}
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{{par begin}}
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{{param list item | ch | character}}
+
{{par|ch|character}}
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{{param list item | loc | locale }}
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{{par|loc|locale}}
−
{{param list end}}
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{{par end}}
  
 
===Return value===
 
===Return value===
 +
Returns {{c|true}} if the character is classified as printable, {{c|false}} otherwise.
  
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Returns {{cpp|true}} if the character is classified as printable, {{cpp|false}} otherwise.
+
===Possible implementation===
−
 
+
{{eq fun
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===Equivalent function===
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|1=
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{{eq fun cpp
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template<class CharT>
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| 1=
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bool isprint(CharT ch, const std::locale& loc)
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template< class charT >
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{
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bool isprint( charT ch, const std::locale& loc ) {
+
     return std::use_facet<std::ctype<CharT>>(loc).is(std::ctype_base::print, ch);
−
     return std::use_facet<std::ctype<charT>>(loc).is(std::ctype_base::print, ch);
+
 
}
 
}
 
}}
 
}}
  
 
===Example===
 
===Example===
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{{example cpp
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{{example
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| Demonstrates the use of isprint() with different locales (OS-specific).
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|Demonstrates the use of {{tt|isprint()}} with different locales (OS-specific).
−
| code=
+
|code=
 
#include <iostream>
 
#include <iostream>
 
#include <locale>
 
#include <locale>
 +
 
int main()
 
int main()
 
{
 
{
Line 40: Line 40:
 
     std::locale loc1("C");
 
     std::locale loc1("C");
 
     std::cout << "isprint('™', C locale) returned "
 
     std::cout << "isprint('™', C locale) returned "
−
              << std::boolalpha << std::isprint(c, loc1) << '\n';
+
              << std::boolalpha << std::isprint(c, loc1) << '\n';
  
 
     std::locale loc2("en_US.UTF-8");
 
     std::locale loc2("en_US.UTF-8");
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               << std::boolalpha << std::isprint(c, loc2) << '\n';
 
               << std::boolalpha << std::isprint(c, loc2) << '\n';
 
}
 
}
−
| output=
+
|p=true
 +
|output=
 
isprint('™', C locale) returned false
 
isprint('™', C locale) returned false
 
isprint('™', Unicode locale) returned true
 
isprint('™', Unicode locale) returned true
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===See also===
 
===See also===
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{{dcl list begin}}
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{{dsc begin}}
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{{dcl list template | cpp/string/narrow/dcl list isprint}}
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{{dsc inc|cpp/string/byte/dsc isprint}}
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{{dcl list template | cpp/string/wide/dcl list iswprint}}
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{{dsc inc|cpp/string/wide/dsc iswprint}}
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{{dcl list end}}
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{{dsc end}}
 +
 
 +
{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

Latest revision as of 10:30, 3 October 2023

 
C++
 
Localization library
 
Defined in header <locale>
template< class CharT >
bool isprint( CharT ch, const locale& loc );

Checks if the given character is classified as a printable character (including space) by the given locale's std::ctype facet.

Contents

[edit] Parameters

ch - character
loc - locale

[edit] Return value

Returns true if the character is classified as printable, false otherwise.

[edit] Possible implementation

template<class CharT>
bool isprint(CharT ch, const std::locale& loc)
{
    return std::use_facet<std::ctype<CharT>>(loc).is(std::ctype_base::print, ch);
}

[edit] Example

Demonstrates the use of isprint() with different locales (OS-specific).

Run this code
#include <iostream>
#include <locale>
 
int main()
{
    const wchar_t c = L'\u2122'; // trademark sign
 
    std::locale loc1("C");
    std::cout << "isprint('™', C locale) returned "
              << std::boolalpha << std::isprint(c, loc1) << '\n';
 
    std::locale loc2("en_US.UTF-8");
    std::cout << "isprint('™', Unicode locale) returned "
              << std::boolalpha << std::isprint(c, loc2) << '\n';
}

Possible output: 

isprint('™', C locale) returned false
isprint('™', Unicode locale) returned true

[edit] See also

 checks if a character is a printing character
(function) [edit]
checks if a wide character is a printing character
(function) [edit]
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