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std::istrst...::istrstream(3) C++ Standard Libarystd::istrst...::istrstream(3)

NAME
       std::istrstream::istrstream - std::istrstream::istrstream

Synopsis
	  explicit  istrstream(	 const char* s );	    (1)	(deprecated in
       C++98)
							      (removed	    in
       C++26)
	  explicit  istrstream(	 char* s );		    (2)	(deprecated in
       C++98)
							      (removed	    in
       C++26)
	  istrstream(  const  char* s, std::streamsize n ); (3)	(deprecated in
       C++98)
							      (removed	    in
       C++26)
	  istrstream(  char*  s, std::streamsize n );	    (4)	(deprecated in
       C++98)
							      (removed	    in
       C++26)

	  Constructs new std::istrstream and its underlying std::strstreambuf.

	  1,2)	 Constructs   the   underlying	std::strstreambuf  by  calling
       strstreambuf(s, 0) and
	  initializes the base class with the address of the strstreambuf. The
       behavior	is
	  undefined if s is not	pointing at an element	of  a  null-terminated
       array.
	  3,4)	 Constructs   the   underlying	std::strstreambuf  by  calling
       strstreambuf(s, n) and
	  initializes the base class with the address of the strstreambuf. The
       behavior	is
	  undefined if s is not	pointing at  an	 element  of  an  array	 whose
       length is at least n
	  elements.

Parameters
	  s - C-string or char array to	use as the contents of the stream
	  n - size of the array

Example
       // Run this code

	#include <iostream>
	#include <strstream>

	int main()
	{
	    std::istrstream s1("1 2 3"); // string literal
	    int	n1, n2,	n3;
	    if (s1 >> n1 >> n2 >> n3)
		std::cout << n1	<< ", "	<< n2 << ", " << n3 << '\n';

	    char arr[] = {'4', ' ', '5', ' ', '6'};
	    std::istrstream s2(arr, sizeof arr);
	    if (s2 >> n1 >> n2 >> n3)
		std::cout << n1	<< ", "	<< n2 << ", " << n3 << '\n';
	}

Output:
	1, 2, 3
	4, 5, 6

See also
	  constructor	constructs a strstreambuf object
			(public	member function	of std::strstreambuf)
	  constructor	constructs an ostrstream object, optionally allocating
       the buffer
			(public	member function	of std::ostrstream)
	  constructor	 constructs  a strstream object, optionally allocating
       the buffer
			(public	member function	of std::strstream)

http://cppreference.com		  2024.06.10	 std::istrst...::istrstream(3)

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