Difference between revisions of "cpp/string/wide/towctrans"
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Andreas Krug (Talk | contribs) m (wc -> ch, {{c}}, headers sorted, fmt, langlinks) |
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| − | Maps the wide character {{c|ch}} using the current C locale's LC_CTYPE mapping category identified by {{c|desc}}. | + | Maps the wide character {{c|ch}} using the current C locale's {{lc|LC_CTYPE}} mapping category identified by {{c|desc}}. |
{{cpp/string/wide/wint_t args}} | {{cpp/string/wide/wint_t args}} | ||
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{{par begin}} | {{par begin}} | ||
{{par|ch|the wide character to map}} | {{par|ch|the wide character to map}} | ||
| − | {{par|desc|the LC_CTYPE mapping, obtained from a call to {{lc|std::wctrans}}}} | + | {{par|desc|the {{lc|LC_CTYPE}} mapping, obtained from a call to {{lc|std::wctrans}}}} |
{{par end}} | {{par end}} | ||
===Return value=== | ===Return value=== | ||
| − | The mapped value of {{c|ch}} using the mapping identified by {{c|desc}} in LC_CTYPE facet of the current C locale. | + | The mapped value of {{c|ch}} using the mapping identified by {{c|desc}} in {{lc|LC_CTYPE}} facet of the current C locale. |
===Example=== | ===Example=== | ||
Latest revision as of 07:38, 18 June 2023
| Defined in header <cwctype>
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| std::wint_t towctrans( std::wint_t ch, std::wctrans_t desc ); |
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Maps the wide character ch using the current C locale's LC_CTYPE mapping category identified by desc.
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 | - | the wide character to map |
| desc | - | the LC_CTYPE mapping, obtained from a call to std::wctrans |
[edit] Return value
The mapped value of ch using the mapping identified by desc in LC_CTYPE facet of the current C locale.
[edit] Example
The following example demonstrates katakana to hiragana character mapping.
Run this code
#include <algorithm> #include <clocale> #include <cwctype> #include <iostream> std::wstring tohira(std::wstring str) { std::transform(str.begin(), str.end(), str.begin(), [](wchar_t c) { return std::towctrans(c, std::wctrans("tojhira")); }); return str; } int main() { std::setlocale(LC_ALL, "ja_JP.UTF-8"); std::wstring kana = L"ヒラガナ"; std::wcout << "katakana characters " << kana << " are " << tohira(kana) << " in hiragana\n"; }
Output:
katakana characters ヒラガナ are ひらがな in hiragana
[edit] See also
| looks up a character mapping category in the current C locale (function) | |
| C documentation for towctrans
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