std::ctype::toupper, std::ctype::do_toupper
From cppreference.com
Defined in header <locale>
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public: CharT toupper( CharT c ) const; |
(1) | |
public: const CharT* toupper( CharT* beg, const CharT* end ) const; |
(2) | |
protected: virtual CharT do_toupper( CharT c ) const; |
(3) | |
protected: virtual const CharT* do_toupper( CharT* beg, const CharT* end ) const; |
(4) | |
1,2) public member function, calls the protected virtual member function
do_toupper
of the most derived class.3) Converts the character
c
to upper case if an upper case form is defined by this locale.4) For every character in the character array
[beg, end)
, for which an upper case form exists, replaces the character with that upper case form.Parameters
c | - | character to convert |
beg | - | pointer to the first character in an array of characters to convert |
end | - | one past the end pointer for the array of characters to convert |
Return value
1,3) upper case character or
c
if no upper case form is listed by this locale.2,4)
end
.Notes
Only 1:1 character mapping can be performed by this function, e.g. the uppercase form of 'ß' is (with some exceptions) the two-character string "SS", which cannot be obtained by do_toupper
.
Example
Run this code
#include <locale> #include <iostream> void try_upper(const std::ctype<wchar_t>& f, wchar_t c) { wchar_t up = f.toupper(c); if (up != c) { std::wcout << "Upper case form of \'" << c << "' is " << up << '\n'; } else { std::wcout << '\'' << c << "' has no upper case form\n"; } } int main() { std::locale::global(std::locale("en_US.utf8")); std::wcout.imbue(std::locale()); std::wcout << "In US English UTF-8 locale:\n"; auto& f = std::use_facet<std::ctype<wchar_t>>(std::locale()); try_upper(f, L's'); try_upper(f, L'ſ'); try_upper(f, L'ß'); std::wstring str = L"Hello, World!"; std::wcout << "Uppercase form of the string '" << str << "' is "; f.toupper(&str[0], &str[0] + str.size()); std::wcout << "'" << str << "'\n"; }
Output:
In US English UTF-8 locale: Upper case form of 's' is S Upper case form of 'ſ' is S 'ß' has no upper case form Uppercase form of the string 'Hello, World!' is 'HELLO, WORLD!'
See also
invokes do_tolower (public member function) | |
converts a character to uppercase (function) | |
converts a wide character to uppercase (function) |