std::ostrstream
From cppreference.com
| Defined in header <strstream>
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| class ostrstream : public std::ostream |
(deprecated in C++98) (removed in C++26) |
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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.
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[edit] Notes
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.
[edit] Member functions
constructs an ostrstream object, optionally allocating the buffer (public member function) | |
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destructs an ostrstream object, optionally deallocating the buffer (virtual public member function) |
obtains a pointer to the associated strstreambuf (public member function) | |
| accesses the output buffer (public member function) | |
| disables/enables automatic reallocation (public member function) | |
| obtains the number of characters written (public member function) |
Inherited from std::basic_ostream
Member functions
Formatted output | |
| inserts formatted data (public member function of std::basic_ostream<CharT,Traits>)
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Unformatted output | |
| inserts a character (public member function of std::basic_ostream<CharT,Traits>)
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| inserts blocks of characters (public member function of std::basic_ostream<CharT,Traits>)
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Positioning | |
| returns the output position indicator (public member function of std::basic_ostream<CharT,Traits>)
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| sets the output position indicator (public member function of std::basic_ostream<CharT,Traits>)
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Miscellaneous | |
| synchronizes with the underlying storage device (public member function of std::basic_ostream<CharT,Traits>)
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Member classes
| implements basic logic for preparation of the stream for output operations (public member class of std::basic_ostream<CharT,Traits>)
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Inherited from std::basic_ios
Member types
| Member type | Definition |
char_type
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CharT
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traits_type
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Traits
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int_type
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Traits::int_type
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pos_type
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Traits::pos_type
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off_type
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Traits::off_type
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Member functions
State functions | |
| checks if no error has occurred i.e. I/O operations are available (public member function of std::basic_ios<CharT,Traits>)
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| checks if end-of-file has been reached (public member function of std::basic_ios<CharT,Traits>)
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| checks if an error has occurred (public member function of std::basic_ios<CharT,Traits>)
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| checks if a non-recoverable error has occurred (public member function of std::basic_ios<CharT,Traits>)
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| checks if an error has occurred (synonym of fail()) (public member function of std::basic_ios<CharT,Traits>)
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checks if no error has occurred (synonym of !fail()) (public member function of std::basic_ios<CharT,Traits>)
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| returns state flags (public member function of std::basic_ios<CharT,Traits>)
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| sets state flags (public member function of std::basic_ios<CharT,Traits>)
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| modifies state flags (public member function of std::basic_ios<CharT,Traits>)
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Formatting | |
| copies formatting information (public member function of std::basic_ios<CharT,Traits>)
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| manages the fill character (public member function of std::basic_ios<CharT,Traits>)
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Miscellaneous | |
| manages exception mask (public member function of std::basic_ios<CharT,Traits>)
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| sets the locale (public member function of std::basic_ios<CharT,Traits>)
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| manages associated stream buffer (public member function of std::basic_ios<CharT,Traits>)
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| manages tied stream (public member function of std::basic_ios<CharT,Traits>)
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| narrows characters (public member function of std::basic_ios<CharT,Traits>)
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| widens characters (public member function of std::basic_ios<CharT,Traits>)
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Inherited from std::ios_base
Member functions
Formatting | |
| manages format flags (public member function of std::ios_base)
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| sets specific format flag (public member function of std::ios_base)
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| clears specific format flag (public member function of std::ios_base)
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| manages decimal precision of floating point operations (public member function of std::ios_base)
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| manages field width (public member function of std::ios_base)
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Locales | |
| sets locale (public member function of std::ios_base)
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| returns current locale (public member function of std::ios_base)
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Internal extensible array | |
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returns a program-wide unique integer that is safe to use as index to pword() and iword() (public static member function of std::ios_base)
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| resizes the private storage if necessary and access to the long element at the given index (public member function of std::ios_base)
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| resizes the private storage if necessary and access to the void* element at the given index (public member function of std::ios_base)
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Miscellaneous | |
| registers event callback function (public member function of std::ios_base)
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sets whether C++ and C I/O libraries are interoperable (public static member function of std::ios_base)
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Member classes | |
| stream exception (public member class of std::ios_base)
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| initializes standard stream objects (public member class of std::ios_base)
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Member types and constants | |||||||||||||||||
| Type | Explanation | ||||||||||||||||
| stream open mode type
The following constants are also defined:
(typedef) | |||||||||||||||||
| formatting flags type
The following constants are also defined:
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