NAME¶

std::isupper(std::locale) - std::isupper(std::locale)

Synopsis¶

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 std::isupper() with different locales (OS-specific).

// Run this code

#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

See also¶

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