ostrstreambasic_ostreambasic_iosios_base
Writes to an array in memory.
#include <strstream> class ostrstream : public basic_ostream<char>
The class ostrstream writes to an array in memory. It uses a private strstreambuf object to control the associated array object. It inherits from basic_ostream<char> and therefore can use all the formatted and unformatted output functions.
This is a deprecated feature and might not be available in future versions.
class ostrstream : public basic_ostream<char> { public: typedef char_traits<char> traits; typedef char char_type; typedef typename traits::int_type int_type; typedef typename traits::pos_type pos_type; typedef typename traits::off_type off_type; ostrstream(); ostrstream(char *s, int n, ios_base::openmode = ios_base::out); virtual ~ostrstream(); strstreambuf *rdbuf() const; void freeze(int freezefl = 1); char *str(); int pcount() const; };
char_type
The type char_type is a synonym of type char.
int_type
The type int_type is a synonym of type traits::in_type.
off_type
The type off_type is a synonym of type traits::off_type.
pos_type
The type pos_type is a synonym of type traits::pos_type.
traits
The type traits is a synonym of type char_traits<char>.
ostrstream();
Constructs an object of class ostrstream, initializing the base class basic_ostream<char> with the associated strstreambuf object. The strstreambuf object is initialized by calling its default constructor strstreambuf().
ostrstream(char* s, int n, ios_base::openmode mode = ios_base::out);
Constructs an object of class ostrstream, initializing the base class basic_ostream<char> with the associated strstreambuf object. The strstreambuf object is initialized by calling one of two constructors:
If mode & app == 0, it calls strstreambuf(s,n,s)
Otherwise it calls strstreambuf(s,n,s + ::strlen(s))
virtual ~ostrstream();
Destroys an object of class ostrstream.
void freeze(bool freezefl = 1);
If the mode is dynamic, alters the freeze status of the dynamic array object as follows:
If freezefl is false, the function sets the freeze status to frozen.
Otherwise, it clears the freeze status.
int pcount() const;
Returns the size of the output sequence.
strstreambuf* rdbuf() const;
Returns a pointer to the private strstreambuf object associated with the stream.
char* str();
Returns a pointer to the underlying array object, which may be null.
See strstream, istrstream and strstreambuf examples.
char_traits(3C++), ios_base(3C++), basic_ios(3C++), strstreambuf(3C++), istrstream(3C++), strstream(3C++)
Working Paper for Draft Proposed International Standard for Information Systems--Programming Language C++, Annex D Compatibility features Section D.6.3
ANSI X3J16/ISO WG21 Joint C++ Committee