table of contents
std::islower(std::locale)(3) | C++ Standard Libary | std::islower(std::locale)(3) |
NAME¶
std::islower(std::locale) - std::islower(std::locale)
Synopsis¶
Defined in header <locale>
template< class charT >
bool islower( charT ch, const locale& loc );
Checks if the given character is classified as a lowercase 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 lowercase, false otherwise.
Possible implementation¶
template< class charT >
bool islower( charT ch, const std::locale& loc ) {
return
std::use_facet<std::ctype<charT>>(loc).is(std::ctype_base::lower,
ch);
}
Example¶
Demonstrates the use of islower() with different locales (OS-specific).
// Run this code
#include <iostream>
#include <locale>
int main()
{
const wchar_t c = L'\u03c0'; // greek small letter pi
std::locale loc1("C");
std::cout << "islower('π', C locale) returned "
<< std::boolalpha << std::islower(c, loc1) << '\n';
std::locale loc2("en_US.UTF8");
std::cout << "islower('π', Unicode locale) returned "
<< std::boolalpha << std::islower(c, loc2) << '\n';
}
Output:¶
islower('π', C locale) returned false
islower('π', Unicode locale) returned true
See also¶
islower checks if a character is lowercase
(function)
iswlower checks if a wide character is lowercase
(function)
2022.07.31 | http://cppreference.com |