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std::basic_ostream::write(3)  C++ Standard Libary std::basic_ostream::write(3)

NAME
       std::basic_ostream::write - std::basic_ostream::write

Synopsis
	  basic_ostream& write(	const char_type* s, std::streamsize count );

	  Behaves  as  an  UnformattedOutputFunction.  After  constructing and
       checking	the sentry
	  object, outputs the characters  from	successive  locations  in  the
       character array
	  whose	first element is pointed to by s. Characters are inserted into
       the output
	  sequence until one of	the following occurs:

	    * exactly count characters are inserted
	    *  inserting  into	the  output sequence fails (in which case set-
       state(badbit) is
	      called)

Parameters
	  s	- pointer to the character string to write
	  count	- number of characters to write

Return value
	  *this

Exceptions
	  failure if an	error occurred (the error state	flag is	 not  goodbit)
       and exceptions()
	  is set to throw for that state.

	  If  an internal operation throws an exception, it is caught and bad-
       bit is set. If
	  exceptions() is set for badbit, the exception	is rethrown.

Notes
	  This function	is not overloaded for the types	 signed	 char  or  un-
       signed char, unlike
	  the formatted	operator<<

	  Also,	 unlike	the formatted output functions,	this function does not
       set the failbit
	  on failure.

	  When using a non-converting locale (the default locale  is  non-con-
       verting), the
	  overrider  of	 this function in std::basic_ofstream may be optimized
       for zero-copy
	  bulk I/O (by means of	overriding std::streambuf::xsputn)

Example
	  This function	may be used to output object representations, i.e. bi-
       nary output

       // Run this code

	#include <iostream>

	int main()
	{
	    int	n = 0x41424344;
	    std::cout.write(reinterpret_cast<char*>(&n), sizeof	n) << '\n';

	    char c[]="This is sample text.";
	    std::cout.write(c, 4).write("!\n", 2);
	}

Possible output:
	DCBA
	This!

See also
	  operator<<(std::basic_ostream) inserts character data	or insert into
       rvalue stream
					 (function template)
	  put				 inserts a character
					 (public member	function)

http://cppreference.com		  2022.07.31	  std::basic_ostream::write(3)

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