NAME¶

std::towctrans - std::towctrans

Synopsis¶

Defined in header <cwctype>
std::wint_t towctrans( std::wint_t wc, std::wctrans_t desc );

Maps the wide character wc 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.

Parameters¶

ch - the wide character to map
desc - the LC_CTYPE mapping, obtained from a call to std::wctrans

Return value¶

The mapped value of ch using the mapping identified by desc in LC_CTYPE facet of the
current C locale.

Example¶

The following example demonstrates katakana to hiragana character mapping

// Run this code

#include <clocale>
#include <cwctype>
#include <iostream>
#include <algorithm>

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

See also¶

wctrans looks up a character mapping category in the current C locale
(function)