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std::btowc

From cppreference.com
< cpp‎ | string‎ | multibyte
 
 
 
 
Defined in header <cwchar>
std::wint_t btowc( int c );

Widens a single-byte character c to its wide character equivalent.

Most multibyte character encodings use single-byte codes to represent the characters from the ASCII character set. This function may be used to convert such characters to wchar_t.

[edit] Parameters

c - single-byte character to widen

[edit] Return value

WEOF if c is EOF .

Wide character representation of c if (unsigned char)c is a valid single-byte character in the initial shift state, WEOF otherwise.

[edit] Example

Run this code
#include <clocale>
#include <cwchar>
#include <iostream>
 
void try_widen(char c)
{
 std::wint_t w = std::btowc(c);
 if (w != WEOF)
 std::cout << "The single-byte character " << +(unsigned char)c
 << " widens to " << +w << '\n';
 else
 std::cout << "The single-byte character " << +(unsigned char)c
 << " failed to widen\n";
}
 
int main()
{
 std::setlocale (LC_ALL, "lt_LT.iso88594");
 std::cout << std::hex << std::showbase << "In Lithuanian ISO-8859-4 locale:\n";
 try_widen('A');
 try_widen('\xdf'); // German letter ß (U+00df) in ISO-8859-4
 try_widen('\xf9'); // Lithuanian letter ų (U+0173) in ISO-8859-4
 
 std::setlocale (LC_ALL, "lt_LT.utf8");
 std::cout << "In Lithuanian UTF-8 locale:\n";
 try_widen('A');
 try_widen('\xdf');
 try_widen('\xf9');
}

Possible output:

In Lithuanian ISO-8859-4 locale:
The single-byte character 0x41 widens to 0x41
The single-byte character 0xdf widens to 0xdf
The single-byte character 0xf9 widens to 0x173
In Lithuanian UTF-8 locale:
The single-byte character 0x41 widens to 0x41
The single-byte character 0xdf failed to widen
The single-byte character 0xf9 failed to widen

[edit] See also

narrows a wide character to a single-byte narrow character, if possible
(function) [edit]
[virtual]
converts a character or characters from char to CharT
(virtual protected member function of std::ctype<CharT>) [edit]
C documentation for btowc
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/string/multibyte/btowc&oldid=153036"

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