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POHow is std::iostream buffered?
 

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  1. POHow is std::iostream buffered?
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    <h1>General use case</h1> <p>I am trying to implement a basic shell.</p> <h1>Description</h1> <p>I need to read user input until some delimiters are pressed so a corresponding action can be performed. Those delimiter could be a single 'a', a single 'b' or a single 'c'.</p> <p>An input example would look like this (where <code>&gt;</code> is the shell prompt):</p> <pre><code>&gt; 111-222-333-444a Ok, '111-222-333-444' entered </code></pre> <h2>Why do I want inline delimiter instead of 'new-line' delimiter?</h2> <p>Because I would like to listen to keyboard event such as 'up-arrow' to erase the current command and print the last command (implementing a history feature).</p> <p>Because I would like to listen to keyboard event such as 'tabulation' to automaticly complete the current command (implementing auto-completion feature).</p> <h2>What I have so far</h2> <p>Up to now, my code looks like this:</p> <pre><code>bool done = false; char c; while (!done &amp;&amp; std::cin.get(c)) { switch (c) { case 'a': // Do something corresponding to 'a' done = true; break; case 'b': // Do something corresponding to 'b' done = true; break; case 'c': // Do something corresponding to 'c' done = true; break; default: // buffer input until a delimiter is pressed break; } } </code></pre> <p>However, the loop seem to be executed only after the 'new-line' key have been pressed. This behaviour kill the interactive essence of the user input.</p> <h2>What is the question?</h2> <p>I know std::ostream is buffered so content is not write to disk until some event occured but what about std::istream. Is it buffered? If yes, how is it and what are my option to bypass this behaviour?</p> <p>Also, I've tagged this question as 'homework' because, event if it is not a school exercice, it is an exercise I am trying to do by myself and I do not want to only pick a library that implement all this stuff.</p>
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    1. COThe question is very well described, with clear objective, reasoning behind it and sample code. Wished more people took the time to do this.
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    2. CO+! for a very nice question.
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