class
<sstream>
std::wostringstream
typedef basic_ostringstream<wchar_t> wostringstream;
Output string stream (wide)
Output stream class to operate on strings of wide characters.
This is an instantiation of basic_ostringstream with the following template parameters:
| template parameter | definition | comments |
|---|
| charT | wchar_t | Aliased as member char_type |
| traits | char_traits<wchar_t> | Aliased as member traits_type |
| Alloc | allocator<wchar_t> | Aliased as member allocator_type |
Apart from the internal string buffer of type wstringbuf, objects of this class keep a set of internal fields inherited from ios_base and wios:
| field | member functions | description |
|---|
| Formatting | format flags | flags
setf
unsetf | A set of internal flags that affect how certain input/output operations are interpreted or generated.
See member type fmtflags. |
| field width | width | Width of the next formatted element to insert. |
| display precision | precision | Decimal precision for the next floating-point value inserted. |
| locale | getloc
imbue | The locale object used by the function for formatted input/output operations affected by localization properties. |
| fill character | fill | Character to pad a formatted field up to the field width (width). |
| State | error state | rdstate
setstate
clear | The current error state of the stream.
Individual values may be obtained by calling good, eof, fail and bad.
See member type iostate. |
| exception mask | exceptions | The state flags for which a failure exception is thrown.
See member type iostate. |
| Other | callback stack | register_callback | Stack of pointers to functions that are called when certain events occur. |
| extensible arrays | iword
pword
xalloc | Internal arrays to store objects of type long and void*. |
| tied stream | tie | Pointer to output stream that is flushed before each i/o operation on this stream. |
| stream buffer | rdbuf | Pointer to the associated basic_streambuf object, which is charge of all input/output operations. |
Member types
The class declares the following member types:
And these member types inherited from ios_base and wostream:
- event
- Type to indicate event type (public member type
)
- event_callback
- Event callback function type (public member type
)
- failure
- Base class for stream exceptions (public member class
)
- fmtflags
- Type for stream format flags (public member type
)
- Init
- Initialize standard stream objects (public member class
)
- iostate
- Type for stream state flags (public member type
)
- openmode
- Type for stream opening mode flags (public member type
)
- seekdir
- Type for stream seeking direction flag (public member type
)
- sentry
- Prepare stream for output (public member class
)
Public member functions
Note: This section links to the references for members of its basic template (basic_ostringstream).
- (constructor)
- Construct object (public member function
)
- str
- Get/set content (public member function
)
- rdbuf
- Get stream buffer (public member function
)
- operator=
- Move assignment (public member function
)
- swap
- Swap internals (public member function
)
Public member functions inherited from wostream
- operator<<
- Insert formatted output (public member function
)
- put
- Put character (public member function
)
- write
- Write block of data (public member function
)
- tellp
- Get position in output sequence (public member function
)
- seekp
- Set position in output sequence (public member function
)
- flush
- Flush output stream buffer (public member function
)
Public member functions inherited from wios
- good
- Check whether state of stream is good (public member function
)
- eof
- Check whether eofbit is set (public member function
)
- fail
- Check whether failbit or badbit is set (public member function
)
- bad
- Check whether badbit is set (public member function
)
- operator!
- Evaluate stream (not) (public member function
)
- operator bool
- Evaluate stream (public member function
)
- rdstate
- Get error state flags (public member function
)
- setstate
- Set error state flag (public member function
)
- clear
- Set error state flags (public member function
)
- copyfmt
- Copy formatting information (public member function
)
- fill
- Get/set fill character (public member function
)
- exceptions
- Get/set exceptions mask (public member function
)
- imbue
- Imbue locale (public member function
)
- tie
- Get/set tied stream (public member function
)
- rdbuf
- Get/set stream buffer (public member function
)
- narrow
- Narrow character (public member function
)
- widen
- Widen character (public member function
)
Public member functions inherited from ios_base
- flags
- Get/set format flags (public member function
)
- setf
- Set specific format flags (public member function
)
- unsetf
- Clear specific format flags (public member function
)
- precision
- Get/Set floating-point decimal precision (public member function
)
- width
- Get/set field width (public member function
)
- imbue
- Imbue locale (public member function
)
- getloc
- Get current locale (public member function
)
- xalloc
- Get new index for extensible array [static] (public static member function
)
- iword
- Get integer element of extensible array (public member function
)
- pword
- Get pointer element of extensible array (public member function
)
- register_callback
- Register event callback function (public member function
)
- sync_with_stdio
- Toggle synchronization with cstdio streams [static] (public static member function
)
Non-member function overloads
- swap
- Swap output string streams (function template
)