Get Lines From User straight into a file (without using temporary variables)

[Ronen]

Hi guys ,

When dealing with files,how can I get a line from the user , and put it in a file ? (I mean that after the user has pressed "ENTER" , put the entire line in a file)
something like :
I'm the user and this is a line that I'd like to put in a file

The main goal is to write a program with o(1) memory allocator.

The thing is ,I don't know what's the length of each line.What I need is to get all input into the file without using any primitives.

I've tried :

	std::ofstream tester("tester.txt");
	std::cin >> tester.rdbuf();  // program keeps staying in that line
        // here is more code 
        // here also 
        // ... 

but after I type some lines , the code keeps staying in the line
"std::cin >> tester.rdbuf();" . Isn't there a way to get a stream of characters straight into a file ? google thinks not .

Regards,Ron