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std::ostrstream(3) C++ Standard Libary std::ostrstream(3) NAME std::ostrstream - std::ostrstream Synopsis Defined in header <strstream> class ostrstream : public std::ostream (deprecated in C++98) (removed in C++26) 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. Notes After any call to str(), a call to freeze(false) is required to al- low 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. Member functions constructor constructs an ostrstream object, optionally allocating the buffer (public member function) destructor destructs an ostrstream object, optionally deallocat- ing the buffer [virtual] (virtual public member function) rdbuf obtains a pointer to the associated strstreambuf (public member function) str accesses the output buffer (public member function) freeze disables/enables automatic reallocation (public member function) pcount obtains the number of characters written (public member function) Inherited from std::basic_ostream Member functions Formatted output operator<< inserts formatted data (public member function of std::basic_os- tream<CharT,Traits>) Unformatted output put inserts a character (public member function of std::basic_os- tream<CharT,Traits>) write inserts blocks of characters (public member function of std::basic_os- tream<CharT,Traits>) Positioning tellp returns the output position indicator (public member function of std::basic_os- tream<CharT,Traits>) seekp sets the output position indicator (public member function of std::basic_os- tream<CharT,Traits>) Miscellaneous flush synchronizes with the underlying storage device (public member function of std::basic_os- tream<CharT,Traits>) Member classes sentry implements basic logic for preparation of the stream for out- put operations (public member class of std::basic_ostream<CharT,Traits>) 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 good checks if no error has occurred i.e. I/O operations are available (public member function of std::ba- sic_ios<CharT,Traits>) eof checks if end-of-file has been reached (public member function of std::ba- sic_ios<CharT,Traits>) fail checks if an error has occurred (public member function of std::ba- sic_ios<CharT,Traits>) bad checks if a non-recoverable error has occurred (public member function of std::ba- sic_ios<CharT,Traits>) operator! checks if an error has occurred (synonym of fail()) (public member function of std::ba- sic_ios<CharT,Traits>) operator bool checks if no error has occurred (synonym of !fail()) (public member function of std::ba- sic_ios<CharT,Traits>) rdstate returns state flags (public member function of std::ba- sic_ios<CharT,Traits>) setstate sets state flags (public member function of std::ba- sic_ios<CharT,Traits>) clear modifies state flags (public member function of std::ba- sic_ios<CharT,Traits>) Formatting copyfmt copies formatting information (public member function of std::ba- sic_ios<CharT,Traits>) fill manages the fill character (public member function of std::ba- sic_ios<CharT,Traits>) Miscellaneous exceptions manages exception mask (public member function of std::ba- sic_ios<CharT,Traits>) imbue sets the locale (public member function of std::ba- sic_ios<CharT,Traits>) rdbuf manages associated stream buffer (public member function of std::ba- sic_ios<CharT,Traits>) tie manages tied stream (public member function of std::ba- sic_ios<CharT,Traits>) narrow narrows characters (public member function of std::ba- sic_ios<CharT,Traits>) widen widens characters (public member function of std::ba- sic_ios<CharT,Traits>) Inherited from std::ios_base Member functions Formatting flags manages format flags (public member function of std::ios_base) setf sets specific format flag (public member function of std::ios_base) unsetf clears specific format flag (public member function of std::ios_base) precision manages decimal precision of floating point opera- tions (public member function of std::ios_base) width manages field width (public member function of std::ios_base) Locales imbue sets locale (public member function of std::ios_base) getloc returns current locale (public member function of std::ios_base) Internal extensible array xalloc returns a program-wide unique integer that is safe to use as index [static] to pword() and iword() (public static member function of std::ios_base) resizes the private storage if necessary and ac- cess to the long iword element at the given index (public member function of std::ios_base) resizes the private storage if necessary and ac- cess to the void* pword element at the given index (public member function of std::ios_base) Miscellaneous register_callback registers event callback function (public member function of std::ios_base) sync_with_stdio sets whether C++ and C I/O libraries are interop- erable [static] (public static member function of std::ios_base) Member classes failure stream exception (public member class of std::ios_base) Init initializes standard stream objects (public member class of std::ios_base) Member types and constants Type Explanation stream open mode type The following constants are also defined: Constant Explanation app seek to the end of stream before each write binary open in binary mode openmode in open for reading out open for writing trunc discard the contents of the stream when opening ate seek to the end of stream immedi- ately after open noreplace (C++23) open in exclusive mode (typedef) formatting flags type The following constants are also defined: Constant Explanation dec use decimal base for integer I/O: see std::dec oct use octal base for integer I/O: see std::oct hex use hexadecimal base for integer I/O: see std::hex basefield dec | oct | hex. Useful for masking oper- ations left left adjustment (adds fill characters to the right): see std::left right right adjustment (adds fill characters to the left): see std::right internal internal adjustment (adds fill characters to the internal designated point): see std::internal adjustfield left | right | internal. Useful for mask- ing operations generate floating point types using sci- entific notation, scientific or hex notation if combined with fixed: see std::scientific fmtflags generate floating point types using fixed notation, or fixed hex notation if combined with scientific: see std::fixed floatfield scientific | fixed. Useful for masking operations boolalpha insert and extract bool type in alphanu- meric format: see std::boolalpha generate a prefix indicating the numeric base for integer showbase output, require the currency indicator in monetary I/O: see std::showbase showpoint generate a decimal-point character uncon- ditionally for floating-point number output: see std::showpoint showpos generate a + character for non-negative numeric output: see std::showpos skipws skip leading whitespace before certain input operations: see std::skipws unitbuf flush the output after each output opera- tion: see std::unitbuf replace certain lowercase letters with their uppercase uppercase equivalents in certain output operations: see std::uppercase (typedef) state of the stream type The following constants are also defined: Constant Explanation iostate goodbit no error badbit irrecoverable stream error failbit input/output operation failed (formatting or extraction error) eofbit associated input sequence has reached end- of-file (typedef) seeking direction type The following constants are also defined: seekdir Constant Explanation beg the beginning of a stream end the ending of a stream cur the current position of stream position in- dicator (typedef) event specifies event type (enum) event_callback callback function type (typedef) http://cppreference.com 2024.06.10 std::ostrstream(3)
NAME | Synopsis | Notes | Member functions | Member functions | Formatted output | Unformatted output | Positioning | Miscellaneous | Member classes | Member types | Member functions | State functions | Formatting | Miscellaneous | Member functions | Formatting | Locales | Internal extensible array | Miscellaneous | Member classes | Member types and constants
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