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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/../locale/isupper.html below:

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

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.

[edit] Parameters ch - character loc - locale [edit] Return value

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

[edit] Possible implementation [edit] Example

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

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

Possible output:

isupper('Þ', C locale) returned false
islower('Þ', C locale) returned false
isupper('Þ', Unicode locale) returned true
islower('Þ', Unicode locale) returned false
[edit] See also checks if a character is an uppercase character
(function) [edit] checks if a wide character is an uppercase character
(function) [edit]

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