basic_stringstream

Overview

basic_stringstream class is designed to read from and write to memory stream.

Details

The class template basic_stringstream provides support for high level input and output operations on memory streams. The supported operations include formatted input and output (e.g. integer values or whitespace-separated characters and characters strings) and unformatted input and output(e.g. raw characters and character arrays). 

basic_stringstream class is basically derived class of  basic_istringstream and basic_ostringstream. It has no additional functionality other than constructor. 

Syntax

template<class CharT, class Traits = char_traits<CharT>> 
class basic_stringstream: public basic_iostream<CharT,Traits>

where CharT can be char or wchar_t. It's derived from basic_ios class.

member types

Following properties are defined.

Name	Definition
char_type	char,wchar_t
traits_type	char_traits<char_type>
int_type	char_traits<char_type>::int_type
pos_type	char_traits<char_type>::pos_type
off_type	char_traits<char_type>::off_type

openmode➹

The openmode flags indicate how the streams such as disk files or memory streams can be opened for IO operations such as read, write or append.

Constructor

Name	Description
basic_stringstream (ios_base::openmode mode = ios_base::in) basic_stringstream (const basic_string& s, ios_base::openmode mode = ios_base::in) basic_stringstream (basic_stringstream&& buf)	Constructs an empty basic_istringstream object. Constructs basic_istringstream object with the content from s. move constructor The mode constants are defined in ios_base class. Example istringstream s, s2 {"hello, world!"};

Methods

Name
Description
basic_streambuf* rdbuf()
Returns pointer to the underlying raw file device object.

Example
istringstream s {"hello, world!"};
auto sb = s.rdbuf();
void str
(const basic_string& s) 
basic_string str()
Sets the current contents of the stream to s
Returns the current contents of the stream as string.
Example
istringstream ss,ss2;
ss.str("hello, world!");
ss2.str(ss.str());