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Returns a reference to facet Facet of locale loc.
If the facet is not present in the locale, the function throws a bad_cast exception.
The function has_facet can be used to check if a locale has a particular facet present before attempting to use it with this function.
The template parameter Facet shall be a facet type.
A facet type is a type publicly derived (directly or indirectly) from locale::facet with a static member id of type locale::id, such as the standard facets collate, codecvt, ctype, messages, moneypunct, money_get, money_put, numpunct, num_get, num_put, time_get and time_put.
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<locale>
- has_facet
- locale
- use_facet
-
wbuffer_convertC++11
-
wstring_convertC++11
functions
standard facets
function template
<locale>
std::use_facet
template <class Facet> const Facet& use_facet (const locale& loc);
Access facet of locale
If the facet is not present in the locale, the function throws a bad_cast exception.
The function has_facet can be used to check if a locale has a particular facet present before attempting to use it with this function.
Parameters
- loc
- locale object.
The template parameter Facet shall be a facet type.
A facet type is a type publicly derived (directly or indirectly) from locale::facet with a static member id of type locale::id, such as the standard facets collate, codecvt, ctype, messages, moneypunct, money_get, money_put, numpunct, num_get, num_put, time_get and time_put.
Return type
A const-qualified reference to the facet object.Data races
Argument loc is accessed, and the returned object may be used to access facet object.Exception safety
Strong guarantee: if an exception is thrown, there are no changes in loc.See also
- has_facet
- Check if locale has facet (function template)
- locale::facet
- Locale facet (public member class)
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Spotted an error? contact us