Difference between revisions of "cpp/string/wide/towupper"
From cppreference.com
m (iso 30112 link) |
m (tt) |
||
| (3 intermediate revisions by 3 users not shown) | |||
| Line 1: | Line 1: | ||
{{cpp/title|towupper}} | {{cpp/title|towupper}} | ||
{{cpp/string/wide/navbar}} | {{cpp/string/wide/navbar}} | ||
| − | {{ddcl | header=cwctype | | + | {{ddcl|header=cwctype| |
std::wint_t towupper( std::wint_t ch ); | std::wint_t towupper( std::wint_t ch ); | ||
}} | }} | ||
Converts the given wide character to uppercase, if possible. | Converts the given wide character to uppercase, if possible. | ||
| + | |||
| + | {{cpp/string/wide/wint_t args}} | ||
===Parameters=== | ===Parameters=== | ||
{{par begin}} | {{par begin}} | ||
| − | {{par | ch | wide character to be converted}} | + | {{par|ch|wide character to be converted}} |
{{par end}} | {{par end}} | ||
===Return value=== | ===Return value=== | ||
| − | Uppercase version of {{ | + | Uppercase version of {{c|ch}} or unmodified {{c|ch}} if no uppercase version is listed in the current C locale. |
===Notes=== | ===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 {{ | + | Only 1:1 character mapping can be performed by this function, e.g. the uppercase form of {{c/core|'ß'}} is (with some exceptions) the two-character string {{c/core|"SS"}}, which cannot be obtained by {{tt|std::towupper}}. |
| − | [ | + | [https://www.open-std.org/JTC1/SC35/WG5/docs/30112d10.pdf ISO 30112] specifies which pairs of Unicode characters are included in this mapping. |
===Example=== | ===Example=== | ||
| − | {{example | The latin | + | {{example |
| − | | code= | + | |The latin {{enwiki|Long s|letter 'ſ' (U+017F)}} is the alternative lowercase form of {{c/core|'S'}} (U+0053). |
| − | + | |code= | |
| − | + | ||
#include <clocale> | #include <clocale> | ||
| + | #include <cwctype> | ||
| + | #include <iostream> | ||
int main() | int main() | ||
| Line 31: | Line 34: | ||
std::cout << std::hex << std::showbase; | std::cout << std::hex << std::showbase; | ||
| − | std::cout << "in the default locale, towupper(" << | + | std::cout << "in the default locale, towupper(" |
| + | << static_cast<std::wint_t>(c) << ") = " | ||
<< std::towupper(c) << '\n'; | << std::towupper(c) << '\n'; | ||
| + | |||
std::setlocale(LC_ALL, "en_US.utf8"); | std::setlocale(LC_ALL, "en_US.utf8"); | ||
| − | std::cout << "in Unicode locale, towupper(" << | + | std::cout << "in Unicode locale, towupper(" |
| + | << static_cast<std::wint_t>(c) << ") = " | ||
<< std::towupper(c) << '\n'; | << std::towupper(c) << '\n'; | ||
} | } | ||
| − | | output= | + | |output= |
in the default locale, towupper(0x17f) = 0x17f | in the default locale, towupper(0x17f) = 0x17f | ||
in Unicode locale, towupper(0x17f) = 0x53 | in Unicode locale, towupper(0x17f) = 0x53 | ||
| Line 44: | Line 50: | ||
===See also=== | ===See also=== | ||
{{dsc begin}} | {{dsc begin}} | ||
| − | {{dsc inc | cpp/string/wide/dsc towlower}} | + | {{dsc inc|cpp/string/wide/dsc towlower}} |
| − | {{dsc inc | cpp/locale/dsc toupper}} | + | {{dsc inc|cpp/locale/dsc toupper}} |
| − | {{dsc inc | cpp/string/byte/dsc toupper}} | + | {{dsc inc|cpp/string/byte/dsc toupper}} |
| − | {{dsc see c | c/string/wide/towupper}} | + | {{dsc see c|c/string/wide/towupper}} |
{{dsc end}} | {{dsc end}} | ||
| − | + | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
Latest revision as of 16:00, 18 June 2023
| Defined in header <cwctype>
|
||
| std::wint_t towupper( std::wint_t ch ); |
||
Converts the given wide character to uppercase, if possible.
If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined.
Contents |
[edit] Parameters
| ch | - | wide character to be converted |
[edit] Return value
Uppercase version of ch or unmodified ch if no uppercase version is listed in the current C locale.
[edit] 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 std::towupper.
ISO 30112 specifies which pairs of Unicode characters are included in this mapping.
[edit] Example
The latin letter 'ſ' (U+017F) is the alternative lowercase form of 'S' (U+0053).
Run this code
#include <clocale> #include <cwctype> #include <iostream> int main() { wchar_t c = L'\u017f'; // Latin small letter Long S ('ſ') std::cout << std::hex << std::showbase; std::cout << "in the default locale, towupper(" << static_cast<std::wint_t>(c) << ") = " << std::towupper(c) << '\n'; std::setlocale(LC_ALL, "en_US.utf8"); std::cout << "in Unicode locale, towupper(" << static_cast<std::wint_t>(c) << ") = " << std::towupper(c) << '\n'; }
Output:
in the default locale, towupper(0x17f) = 0x17f in Unicode locale, towupper(0x17f) = 0x53
[edit] See also
| converts a wide character to lowercase (function) | |
| converts a character to uppercase using the ctype facet of a locale (function template) | |
| converts a character to uppercase (function) | |
| C documentation for towupper
| |
