std::basic_istringstream::basic_istringstream

1	`explicit` `basic_istringstream( ios_base::openmode mode = ios_base::in );`

(1)

explicit basic_istringstream( const std::basic_string<CharT,Traits,Allocator>& str,
                     ios_base::openmode mode = ios_base::in );

(2)

1	`basic_istringstream( basic_istringstream&& other );`

(3)

(since C++11)

Constructs new string stream.

1) Constructs new underlying string device. The underlying basic_stringbuf object is constructed as basic_stringbuf<Char,Traits,Allocator>(mode | ios_base::in).

2) Uses a copy of str as initial contents of the underlying string device. The underlying basic_stringbuf object is constructed as basic_stringbuf<Char,Traits,Allocator>(str, mode | ios_base::in).

3) Move constructor. Constructs the string stream with the state of other using move semantics.

Parameters

str - string to use as initial contents of the string stream

mode

specifies stream open mode. It is bitmask type, the following constants are defined:

Constant	Explanation
`app`	seek to the end of stream before each write
`binary`	open in binary mode
`in`	open for reading
`out`	open for writing
`trunc`	discard the contents of the stream when opening
`ate`	seek to the end of stream immediately after open

other - another string stream to use as source

Example

#include <iostream>
#include <sstream>
int main()
{
    // default constructor (input/output stream)
    std::stringstream buf1;
    buf1 << 7;
    int n = 0;
    buf1 >> n;
    std::cout << "buf1 = " << buf1.str() << " n = " << n << '\n';
  
    // input stream
    std::istringstream inbuf("-10");
    inbuf >> n;
    std::cout << "n = " << n << '\n';
  
    // output stream in append mode (C++11)
    std::ostringstream buf2("test", std::ios_base::ate);
    buf2 << '1';
    std::cout << buf2.str() << '\n';
}

Output:

buf1 = 7 n = 7
n = -10
test1

str	gets or sets the contents of underlying string device object (public member function)
(constructor)	constructs a basic_stringbuf object (public member function of `std::basic_stringbuf`)

std::basic_istringstream::basic_istringstream

Parameters

Example

See also