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<title>FBB::A2x</title>
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<h1 id="title">FBB::A2x</h1>
<h2 id="author">libbobcat-dev_4.04.00-x.tar.gz</h2>
<h2 id="date">2005-2016</h2>
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<title>FBB::A2x(3bobcat)</title>
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<h1 id="title">FBB::A2x(3bobcat)</h1>
<h2 id="author">libbobcat-dev_4.04.00-x.tar.gz Error handler</h2>
<h2 id="date">2005-2016</h2>
<p>
<h2 >NAME</h2>FBB::A2x - Objects performing ascii-to-x (anything) conversions
<p>
<h2 >SYNOPSIS</h2>
<strong >#include <bobcat/a2x></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>
Conversions to most standard numeric types is also available through
functions like <em >std::stol, std::stod</em>, etc.
<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 &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 &operator>>(istream &, Type &)</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 &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 &operator=(std::string const &)</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 &operator=(A2x const &)</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 << A2x("12.4").to<double>() << 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_4.04.00-x.dsc</em>: detached signature;
<li> <em >bobcat_4.04.00-x.tar.gz</em>: source archive;
<li> <em >bobcat_4.04.00-x_i386.changes</em>: change log;
<li> <em >libbobcat1_4.04.00-x_*.deb</em>: debian package holding the
libraries;
<li> <em >libbobcat1-dev_4.04.00-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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