std::towctrans (3) Linux Manual Page

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

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