Difference between revisions of "cpp/locale/isspace"
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| − | {{cpp/title | isspace{{small|(std::locale)}}}} | + | {{cpp/title|isspace{{small|(std::locale)}}}} |
| − | {{cpp/locale/ | + | {{cpp/locale/navbar}} |
| − | + | {{ddcl|header=locale| | |
| − | {{ddcl | header=locale | | + | template< class CharT > |
| − | template< class | + | bool isspace( CharT ch, const locale& loc ); |
| − | bool isspace( | + | |
}} | }} | ||
| − | + | Checks if the given character is classified as a whitespace character by the given locale's {{lc|std::ctype}} facet. | |
| − | Checks if the given character classified as a whitespace character by the given locale's ctype facet. | + | |
===Parameters=== | ===Parameters=== | ||
| − | {{ | + | {{par begin}} |
| − | {{ | + | {{par|ch|character}} |
| − | {{ | + | {{par|loc|locale}} |
| − | {{ | + | {{par end}} |
===Return value=== | ===Return value=== | ||
| + | Returns {{c|true}} if the character is classified as a whitespace character, {{c|false}} otherwise. | ||
| − | + | ===Possible implementation=== | |
| − | + | {{eq fun | |
| − | === | + | |1= |
| − | {{eq fun | + | template<class CharT> |
| − | + | bool isspace(CharT ch, const std::locale& loc) | |
| − | template< class | + | { |
| − | bool isspace( | + | return std::use_facet<std::ctype<CharT>>(loc).is(std::ctype_base::space, ch); |
| − | return std::use_facet<std::ctype< | + | |
} | } | ||
}} | }} | ||
===Example=== | ===Example=== | ||
| − | {{example | + | {{example |
| − | + | |Demonstrates the use of {{tt|std::isspace()}} with different locales (OS-specific). | |
| − | + | |code= | |
#include <iostream> | #include <iostream> | ||
#include <locale> | #include <locale> | ||
| + | |||
void try_with(wchar_t c, const char* loc) | void try_with(wchar_t c, const char* loc) | ||
{ | { | ||
| − | std::wcout << "isspace('" << c << "', locale(\"" << loc << "\")) returned " << std::boolalpha | + | std::wcout << "isspace('" << c << "', locale(\"" << loc << "\")) returned " |
| − | + | << std::boolalpha << std::isspace(c, std::locale(loc)) << '\n'; | |
} | } | ||
| + | |||
int main() | int main() | ||
{ | { | ||
| Line 46: | Line 46: | ||
try_with(EM_SPACE, "en_US.UTF8"); | try_with(EM_SPACE, "en_US.UTF8"); | ||
} | } | ||
| − | + | |p=true | |
| + | |output= | ||
isspace(' ', locale("C")) returned false | isspace(' ', locale("C")) returned false | ||
isspace(' ', locale("en_US.UTF8")) returned true | isspace(' ', locale("en_US.UTF8")) returned true | ||
| Line 52: | Line 53: | ||
===See also=== | ===See also=== | ||
| − | {{ | + | {{dsc begin}} |
| − | {{ | + | {{dsc inc|cpp/string/byte/dsc isspace}} |
| − | {{ | + | {{dsc inc|cpp/string/wide/dsc iswspace}} |
| − | {{ | + | {{dsc end}} |
| + | |||
| + | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | ||
Latest revision as of 10:33, 3 October 2023
| Defined in header <locale>
|
||
| template< class CharT > bool isspace( CharT ch, const locale& loc ); |
||
Checks if the given character is classified as a whitespace character 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 a whitespace character, false otherwise.
[edit] Possible implementation
template<class CharT> bool isspace(CharT ch, const std::locale& loc) { return std::use_facet<std::ctype<CharT>>(loc).is(std::ctype_base::space, ch); } |
[edit] Example
Demonstrates the use of std::isspace() with different locales (OS-specific).
Run this code
#include <iostream> #include <locale> void try_with(wchar_t c, const char* loc) { std::wcout << "isspace('" << c << "', locale(\"" << loc << "\")) returned " << std::boolalpha << std::isspace(c, std::locale(loc)) << '\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"); }
Possible output:
isspace(' ', locale("C")) returned false
isspace(' ', locale("en_US.UTF8")) returned true[edit] See also
| checks if a character is a space character (function) | |
| checks if a wide character is a space character (function) |
