NAME¶

std::ctype::toupper,std::ctype::do_toupper - std::ctype::toupper,std::ctype::do_toupper

Synopsis¶

Defined in header <locale>
public: (1)
CharT toupper( CharT c ) const;
public: (2)
const CharT* toupper( CharT* beg, const CharT* end ) const;
protected: (3)
virtual CharT do_toupper( CharT c ) const;
protected: (4)
virtual const CharT* do_toupper( CharT* beg, const CharT* end ) const;

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 the two-character string "SS" (with some exceptions - see «Capital
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'δ');
try_upper(f, L'ö');
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
Upper case form of 'δ' is Δ
Upper case form of 'ö' is Ö
'ß' has no upper case form
Uppercase form of the string 'Hello, World!' is 'HELLO, WORLD!'

See also¶

tolower invokes do_tolower
(public member function)
toupper converts a character to uppercase
(function)
towupper converts a wide character to uppercase
(function)