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<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>FBB::Tty</title>
<style type="text/css">
    figure {text-align: center;}
    img {vertical-align: center;}
</style>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::Tty</h1>
<h2>libbobcat-dev_4.01.03-x.tar.gz</h2>
<h2>2005-2015</h2>

<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<style type="text/css">
    figure {text-align: center;}
    img {vertical-align: center;}
    figure {text-align: center;}
    img {vertical-align: center;}
</style>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1></h1>

<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>FBB::Tty(3bobcat)</title>
<style type="text/css">
    figure {text-align: center;}
    img {vertical-align: center;}
    figure {text-align: center;}
    img {vertical-align: center;}
    figure {text-align: center;}
    img {vertical-align: center;}
</style>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::Tty(3bobcat)</h1>
<h2>libbobcat-dev_4.01.03-x.tar.gz Controls echoing of characters</h2>
<h2>2005-2015</h2>


<p>
<h2>NAME</h2>FBB::Tty - Controls echoing of characters entered at the terminal
<p>
<h2>SYNOPSIS</h2>
    <strong>#include &lt;bobcat/tty&gt;</strong><br>
    Linking option: <em>-lbobcat</em> 
<p>
<h2>DESCRIPTION</h2>
    <strong>Tty</strong>(3bobcat) objects can be used to control the echoing of characters
entered at the terminal (usually at <em>/dev/tty</em>). Directly reading from
<em>/dev/tty</em> allows programs to read information (e.g., passwords or pass
phrases) even if the standard input stream is redirected to a file. Unless
redirected, <em>std::cin</em> is connected to <em>/dev/tty</em>.
<p>
<strong>Tty</strong>(3bobcat) objects may be used as stand-alone objects or (usually
anonymous) <strong>Tty</strong>(3bobcat) objects may be inserted into or extracted from
streams. When inserting or extracting objects the involved streams are not
affected; only the echoing of characters entered at <em>/dev/tty</em> is
manipulated.
<p>
<strong>Tty</strong>(3bobcat)'s destructor does not reset the echo-state of
<em>/dev/tty</em> to its original value. If that is required a <strong>Tty</strong>(3bobcat)
object must be created first, calling its <strong>echo(Tty::RESET)</strong> member at the
appropriate time. 
<p>
<h2>NAMESPACE</h2>
    <strong>FBB</strong><br>
    All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace <strong>FBB</strong>.
<p>
<h2>INHERITS FROM</h2>
    -
<p>
<h2>ENUM</h2>
<p>
The <em>enum EchoType</em> requests the type of echo-handling:
    <ul>
    <li> <strong>RESET</strong> is used to reset <em>/dev/tty</em>'s state to the actual state
        when a <strong>Tty</strong>(3bobcat) object was constructed
    <li> <strong>ON</strong> is used to activate echoing of characters entered at 
        <em>/dev/tty</em>.
    <li> <strong>OFF</strong> is used to suppress echoing of characters entered at 
        <em>/dev/tty</em>.
    </ul>
<p>
<h2>CONSTRUCTORS</h2>
    <ul>
    <li> <strong>Tty()</strong>:<br>
       The current state of <em>/dev/tty</em> is saved.
<p>
<li> <strong>Tty(EchoType type)</strong>:<br>
       The current state of <em>/dev/tty</em> is saved, and the object's member
        <em>echo(type)</em> is called.
    </ul>
    Default copy and move constructors are available.
<p>
<h2>OVERLOADED OPERATORS</h2>
    <ul>
    <li> <strong>std::istream &amp;operator&gt;&gt;(std::istream &amp;in, Tty const &amp;tty)</strong>:<br>
       The extraction operator does not affect <em>in</em>, but <em>/dev/tty</em>'s
        state is set according to the way the <em>tty</em> object was constructed.
<p>
<li> <strong>std::ostream &amp;operator&lt;&lt;(std::ostream &amp;out, Tty const &amp;tty)</strong>:<br>
       The insertion operator does not affect <em>out</em>, but <em>/dev/tty</em>'s
        state is set according to the way the <em>tty</em> object was constructed.
    </ul>
    Default copy and move assignment operators are available.
<p>
<h2>MEMBER FUNCTION</h2>
<p>
<ul>
    <li> <strong>echo(EchoType type)</strong>:<br>
       <em>/Dev/tty</em>'s state is set according to the <em>EchoType</em> value that is
        passed to this member.
    </ul>
<p>
<h2>EXAMPLE</h2>
<p>
<pre>
#include &lt;iostream&gt;
#include &lt;string&gt;

#include &lt;bobcat/tty&gt;

using namespace std;
using namespace FBB;

int main()
{
    cout &lt;&lt; "Enter some text (not echoed): " &lt;&lt; Tty(Tty::OFF);
    string line;
    getline(cin, line);
    cout &lt;&lt; "\n"
            "You entered: `" &lt;&lt; line &lt;&lt; "'\n";
    
    cout &lt;&lt; "Enter some text (echoed): ";
    getline(cin &gt;&gt; Tty(Tty::ON), line);
    cout &lt;&lt; "You entered: `" &lt;&lt; line &lt;&lt; "'\n";
}



</pre>

<p>
<h2>FILES</h2>
    <em>bobcat/tty</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
    <strong>bobcat</strong>(7), <strong>onekey</strong>(3bobcat)
<p>
<h2>BUGS</h2>
    None Reported.
<p>

<h2>DISTRIBUTION FILES</h2>
    <ul>
    <li> <em>bobcat_4.01.03-x.dsc</em>: detached signature;
    <li> <em>bobcat_4.01.03-x.tar.gz</em>: source archive;
    <li> <em>bobcat_4.01.03-x_i386.changes</em>: change log;
    <li> <em>libbobcat1_4.01.03-x_*.deb</em>: debian package holding the
            libraries;
    <li> <em>libbobcat1-dev_4.01.03-x_*.deb</em>: debian package holding the
            libraries, headers and manual pages;
    <li> <em>http://sourceforge.net/projects/bobcat</em>: public archive location;
    </ul>
<p>
<h2>BOBCAT</h2>
    Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
<p>
<h2>COPYRIGHT</h2>
    This is free software, distributed under the terms of the 
    GNU General Public License (GPL).
<p>
<h2>AUTHOR</h2>
    Frank B. Brokken (<strong>f.b.brokken@rug.nl</strong>).
<p>

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