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Returns the width of an internal character in terms of external characters, if this is a fixed value.
Otherwise, if this is a variable value, the function returns 0.
Alternatively, if the encoding of an external sequence is state-dependent, the function returns -1.
Internally, this function simply calls the virtual protected member do_encoding, which behaves as described above by default.
Possible output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
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<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
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<cstdbool> (stdbool.h)C++11
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<cstdint> (stdint.h)C++11
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<ctgmath> (tgmath.h)C++11
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<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
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<array>C++11
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<forward_list>C++11
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<unordered_map>C++11
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<unordered_set>C++11
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Input/Output:
Multi-threading:
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<atomic>C++11
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<condition_variable>C++11
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<future>C++11
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<mutex>C++11
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<thread>C++11
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Other:
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wbuffer_convertC++11
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wstring_convertC++11
functions
standard facets
codecvt
- codecvt::codecvt
public member functions
protected members
public member function
<locale>
std::codecvt::encoding
int encoding() const throw();
int encoding() const noexcept;
Return encoding width
Otherwise, if this is a variable value, the function returns 0.
Alternatively, if the encoding of an external sequence is state-dependent, the function returns -1.
Internally, this function simply calls the virtual protected member do_encoding, which behaves as described above by default.
Parameters
noneReturn value
One of the following, describing how external characters are encoded:| value | interpretation |
|---|---|
0 | Characters have a variable width, each with a maximum length of max_length. |
-1 | Encoding is state-dependent, possibly with additional shift codes beyond max_length per character. |
| other values | Fixed amount of external characters equivalent to one internal character |
Example
|
|
Possible output:
Characteristics of codecvt<wchar_t,char,mbstate_t>: Encoding: 0 Always noconv: 0 Max length: 5 |
Data races
The facet object is accessed.Exception safety
No-throw guarantee: never throws exceptions.See also
- codecvt::length
- Return length of translated sequence (public member function)
- codecvt::max_length
- Return max length of one character (public member function)
- codecvt::do_encoding
- Return encoding width [virtual] (protected virtual member function)
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