std::isblank(std::locale) - cppreference.com

##### cppreference.com

##### Search

Create account

##### Namespaces

- Page
- Discussion

##### Variants

##### Views

- View
- Edit
- History

##### Actions

# std::isblank(std::locale)

From cppreference.com
< cpp‎ | locale

Defined in header `<locale>` |  |
template< class charT > bool isblank( charT ch, const locale& loc ); |  | (since C++11)

Checks if the given character is classified as a blank character by the given locale's ctype facet.

### [edit] Parameters

ch | - | character
loc | - | locale

### [edit] Return value

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

### [edit] Possible implementation

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

### [edit] Example

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

Run this code

    #include <iostream>
    #include <locale>

    void try_with(wchar_t c, const char* loc)
    {
        std::wcout << "isblank('" << c << "', locale(\"" << loc << "\")) returned " << std::boolalpha
                   << std::isblank(c, std::locale(loc)) << '\n';
    }
    int main()
    {
        const wchar_t IDEO_SPACE = L'\u3000'; // Unicode character 'IDEOGRAPHIC SPACE'
        try_with(IDEO_SPACE, "C");
        try_with(IDEO_SPACE, "en_US.UTF-8");
    }

Output:

    isblank(' ', locale("C")) returned false
    isblank(' ', locale("en_US.UTF-8")) returned true

### [edit] See also

isblank (C++11) | checks if a character is a blank character (function) [edit]
iswblank (C++11) | checks if a wide character is a blank character (function) [edit]

Retrieved from "http://en.cppreference.com/mwiki/index.php?title=cpp/locale/isblank&oldid=63761"