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<html><head>
<title>FBB::A2x</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::A2x</h1>
<h2>libbobcat-dev_3.19.01-x.tar.gz</h2>
<h2>2005-2013</h2>

<html><head>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1></h1>

<html><head>
<title>FBB::A2x(3bobcat)</title>
<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr>
<h1>FBB::A2x(3bobcat)</h1>
<h2>libbobcat-dev_3.19.01-x.tar.gz Error handler</h2>
<h2>2005-2013</h2>


<p>
<h2>NAME</h2>FBB::A2x - Objects performing ascii-to-x (anything) conversions
<p>
<h2>SYNOPSIS</h2>
    <strong>#include &lt;bobcat/a2x&gt;</strong><br>
    Linking option: <em>-lbobcat</em> 
<p>
<h2>DESCRIPTION</h2>
    <strong>FBB::A2x</strong> objects offer the <strong>C++</strong> equivalent of the standard <strong>C</strong>
conversion functions <strong>atoi</strong>(3), <strong>atol</strong>(3), <strong>atof</strong>(3) etc.  <em>A2x</em>
objects generalize these <strong>C</strong> functions to <em>any</em> type that can be extracted
from an <strong>istream</strong> object. Since <strong>FBB::A2x</strong> represents the object-variant
of the <strong>C</strong> functions, and is therefore <em>type-safe</em> and <em>extensible</em>,
their use is greatly preferred over using the standard <strong>C</strong> functions.
<p>
<h2>NAMESPACE</h2>
    <strong>FBB</strong><br>
    All constructors, members, and operators, mentioned in this
man-page, are defined in the namespace <strong>FBB</strong>.
<p>
<h2>INHERITS FROM</h2>
    <strong>std::istringstream</strong>
<p>
<h2>CONSTRUCTORS</h2>
    <ul>
    <li> <strong>A2x()</strong>:<br>
        This constructor constructs an empty <em>A2x</em> object. No
information can be converted from a  thus constructed <em>A2x</em> object.
    <li> <strong>A2x(char const *text)</strong>:<br> 
        This constructor stores <em>text</em>. If <em>text</em> represents a textual
value of some type, the <em>A2x</em> object may be used to initialize or assign
this value to a variable of that particular type. Extraction, however is also
still possible.
    <li> <strong>A2x(std::string const &amp;str)</strong>:<br> 
        This constructor stores the text contained in <em>str</em>. If this text
represents a textual value of some type, the <em>A2x</em> object may be used to
initialize or assign this value to a variable of that particular
type. Extraction is also still possible.
    </ul>
        The copy constructor is available.
<p>
<h2>STATIC MEMBER FUNCTION</h2>
    <ul>
    <li> <strong>bool lastFail()</strong>:<br> 
        This member returns <em>true</em> if the last conversion failed (i.e., the
object's <em>fail()</em> member returned <em>true</em> and returns <em>false</em> otherwise).
This member allows checks on the success of the extraction/conversion using
anonymous <em>A2x</em> objects. The member also returns <em>true</em> when no
conversions have as yet been performed.<br>
    Note that this member is a thread-unsafe <em>static</em> member: in a
multithreaded program locks may be required to ensure that the proper
conversion result is inspected.
    </ul>
<p>
<h2>MEMBER FUNCTION</h2>
    All members of the <strong>istringstream</strong> class are available.
<p>
<ul>
    <li> <strong>Type to()</strong>:<br> 
        This member returns any type <em>Type</em> supporting extractions from
<em>i[string]streams</em>. If the extraction fails, the <em>A2x</em> object's
<em>good()</em> member will return <em>false</em>, and the <em>Type</em>'s default value is
returned. This operator was implemented as a template member function. There
is also a type conversion operator available (see below), but the member
function variant may be preferred over the conversion operator in situations
where explicit disambiguation is required (e.g., in cases where a
conversion has no obvious type solution such as direct insertions) An example
is provided in the <strong>EXAMPLE</strong> section below.
    </ul>
<p>
<h2>OVERLOADED OPERATORS</h2>
    <ul>
    <li> <strong>operator Type()</strong>:<br> 
        Conversion to any type <em>Type</em> supporting
extractions from <em>i[string]streams</em>. If the extraction fails, the <em>A2x</em>
object's <em>good()</em> member will return <em>false</em>, and the <em>Type</em>'s default
value is returned. This operator was implemented as a template member
function.
    <li> <strong>istream &amp;operator&gt;&gt;(istream &amp;, Type &amp;)</strong>:<br> 
        Extraction to any type <em>Type</em> supporting extractions from
<em>i[string]streams</em>. If the extraction fails, the <em>A2x</em> object's
<em>good()</em> member will return <em>false</em>, and the <em>Type</em>'s default value is
returned (this facility is implied by the fact that this class inherits from
<strong>istringstream</strong>, but it's probably useful to stress that the extraction
operation is still available).
    <li> <strong>A2x &amp;operator=(char const *)</strong>:<br> 
        Stores new text in the <em>A2x</em> object, resets the status flags to
<em>ios::good</em>. If a 0-pointer is passed, an empty string is stored.
    <li> <strong>A2x &amp;operator=(std::string const &amp;)</strong>:<br> 
        Stores the text stored in the <em>std::string</em> argument in the
<em>A2x</em> object, resets the status flags to <em>ios::good</em>.
    <li> <strong>A2x &amp;operator=(A2x const &amp;)</strong>:<br> 
    The standard overloaded assignment operator is available
    </ul>
<p>
<h2>EXAMPLE</h2>
         <pre>

    int x = A2x("12");

    A2x a2x("12.50");

    double d;

    d = a2x;

    a2x = "err";

    d = a2x;        // d now 0

    a2x = " a";

    char c = a2x;   // c now 'a'

                    // explicit conversion to `double'
    cout &lt;&lt; A2x("12.4").to&lt;double&gt;() &lt;&lt; endl;
        
</pre>

<p>
<h2>FILES</h2>
    <em>bobcat/a2x</em> - defines the class interface
<p>
<h2>SEE ALSO</h2>
    <strong>bobcat</strong>(7), <strong>x2a</strong>(3bobcat), <strong>atoi</strong>(3), <strong>atol</strong>(3), <strong>atof</strong>(3),
    <strong>strtod</strong>(3), <strong>strtol</strong>(3), <strong>strdoul</strong>(3)
<p>
<h2>BUGS</h2>
    None Reported.
<p>

<h2>DISTRIBUTION FILES</h2>
    <ul>
    <li> <em>bobcat_3.19.01-x.dsc</em>: detached signature;
    <li> <em>bobcat_3.19.01-x.tar.gz</em>: source archive;
    <li> <em>bobcat_3.19.01-x_i386.changes</em>: change log;
    <li> <em>libbobcat1_3.19.01-x_*.deb</em>: debian package holding the
            libraries;
    <li> <em>libbobcat1-dev_3.19.01-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>