std::ctype<CharT>:: toupper, std::ctype<CharT>:: do_toupper
From cppreference.com
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Defined in header
<locale>
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public
:
CharT toupper ( CharT c ) const ; |
(1) | |
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public
:
const CharT * toupper ( CharT * beg, const CharT * end ) const ; |
(2) | |
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protected
:
virtual CharT do_toupper ( CharT c ) const ; |
(3) | |
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protected
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virtual const CharT * do_toupper ( CharT * beg, const CharT * end ) const ; |
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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 <iostream> #include <locale> 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
invokes
do_tolower
(public member function) |
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converts a character to uppercase
(function) |
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converts a wide character to uppercase
(function) |