The class ostrstream implements output operations on array-backed streams. It essentially wraps a raw array I/O device implementation (std::strstreambuf) into the higher-level interface of std::basic_ostream.
The typical implementation of ostrstream holds only one non-derived data member: an object of type std::strstreambuf.
After any call to str(), a call to freeze(false) is required to allow the destructor to deallocate the buffer as necessary.
Before any call to str() that uses the result as a C-string, the buffer must be null-terminated, typically with std::ends.
ostrstream has been deprecated since C++98 and removed since C++26. std::ostringstream, std::ospanstream(since C++23), and boost::iostreams::array_sink are the recommended replacements.
ostrstream object, optionally allocating the buffer
ostrstream object, optionally deallocating the buffer
strstreambuf
std::basic_ostream<CharT,Traits>) [edit] Unformatted output inserts a character
std::basic_ostream<CharT,Traits>) [edit] inserts blocks of characters
std::basic_ostream<CharT,Traits>) [edit] Positioning returns the output position indicator
std::basic_ostream<CharT,Traits>) [edit] sets the output position indicator
std::basic_ostream<CharT,Traits>) [edit] Miscellaneous synchronizes with the underlying storage device
std::basic_ostream<CharT,Traits>) [edit] Member classes implements basic logic for preparation of the stream for output operations
std::basic_ostream<CharT,Traits>) [edit] Inherited from std::basic_ios Member types Member type Definition char_type CharT traits_type Traits int_type Traits::int_type pos_type Traits::pos_type off_type Traits::off_type Member functions State functions checks if no error has occurred i.e. I/O operations are available
std::basic_ios<CharT,Traits>) [edit] checks if end-of-file has been reached
std::basic_ios<CharT,Traits>) [edit] checks if an error has occurred
std::basic_ios<CharT,Traits>) [edit] checks if a non-recoverable error has occurred
std::basic_ios<CharT,Traits>) [edit] checks if an error has occurred (synonym of fail())
std::basic_ios<CharT,Traits>) [edit] checks if no error has occurred (synonym of !fail())
std::basic_ios<CharT,Traits>) [edit] returns state flags
std::basic_ios<CharT,Traits>) [edit] sets state flags
std::basic_ios<CharT,Traits>) [edit] modifies state flags
std::basic_ios<CharT,Traits>) [edit] Formatting copies formatting information
std::basic_ios<CharT,Traits>) [edit] manages the fill character
std::basic_ios<CharT,Traits>) [edit] Miscellaneous manages exception mask
std::basic_ios<CharT,Traits>) [edit] sets the locale
std::basic_ios<CharT,Traits>) [edit] manages associated stream buffer
std::basic_ios<CharT,Traits>) [edit] manages tied stream
std::basic_ios<CharT,Traits>) [edit] narrows characters
std::basic_ios<CharT,Traits>) [edit] widens characters
std::basic_ios<CharT,Traits>) [edit] Inherited from std::ios_base Member functions Formatting manages format flags
std::ios_base) [edit] sets specific format flag
std::ios_base) [edit] clears specific format flag
std::ios_base) [edit] manages decimal precision of floating point operations
std::ios_base) [edit] manages field width
std::ios_base) [edit] Locales sets locale
std::ios_base) [edit] returns current locale
std::ios_base) [edit] Internal extensible array returns a program-wide unique integer that is safe to use as index to pword() and iword()
std::ios_base) [edit] resizes the private storage if necessary and access to the long element at the given index
std::ios_base) [edit] resizes the private storage if necessary and access to the void* element at the given index
std::ios_base) [edit] Miscellaneous registers event callback function
std::ios_base) [edit] sets whether C++ and C I/O libraries are interoperable
std::ios_base) [edit] Member classes stream exception
std::ios_base) [edit] initializes standard stream objects
std::ios_base) [edit] Member types and constants Type Explanation stream open mode type
The following constants are also defined:
The following constants are also defined:
The following constants are also defined:
The following constants are also defined:
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