| 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.
Parameters
| c | - | single-byte character to widen |
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.
Example
#include <iostream>
#include <cwchar>
#include <clocale>
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');
}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
See also
| narrows a wide character to a single-byte narrow character, if possible (function) | |
| [virtual] | converts a character or characters from char to charT (virtual protected member function of std::ctype) |
C documentation for btowc | |
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