std::isupper(std::locale)

Defined in header <locale>

template< class charT >
bool isupper( charT ch, const locale& loc );

Checks if the given character is classified as an uppercase alphabetic character by the given locale's std::ctype facet.

Parameters

ch	-	character
loc	-	locale

Return value

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

Possible implementation

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

Example

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

#include <iostream>
#include <locale>
int main()
{
    const wchar_t c = L'\u00de'; // capital letter thorn
  
    std::locale loc1("C");
    std::cout << "isupper('Þ', C locale) returned "
               << std::boolalpha << std::isupper(c, loc1) << '\n';
  
    std::locale loc2("en_US.UTF8");
    std::cout << "isupper('Þ', Unicode locale) returned "
              << std::boolalpha << std::isupper(c, loc2) << '\n';
}

Output:

isupper('Þ', C locale) returned false
isupper('Þ', Unicode locale) returned true

isupper	checks if a character is an uppercase character (function)
iswupper	checks if a wide character is an uppercase character (function)

std::isupper(std::locale)

Parameters

Return value

Possible implementation

Example

See also