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<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>FBB::PtrIter(3bobcat)</title>
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<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
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<body text="#27408B" bgcolor="#FFFAF0">
<hr/>
<h1 id="title">FBB::PtrIter(3bobcat)</h1>
<h2 id="author">Error handler<br/>(libbobcat-dev_4.08.02-x.tar.gz)</h2>
<h2 id="date">2005-2017</h2>


<p>
<h2 >NAME</h2>FBB::PtrIter - Iterator returning pointer when dereferenced 
<p>
<h2 >SYNOPSIS</h2>
    <strong >#include &lt;bobcat/ptriter&gt;</strong><br/>
<p>
<h2 >DESCRIPTION</h2>
<p>
The <em >PtrIter</em> class template implements an input iterator whose
<em >operator*</em> returns the address of the element the iterator refers to.
Consider a <em >std::unordered_map&lt;std::string, DataType&gt;</em>. Its <em >begin</em> member
returns an iterator whose <em >operator*</em> returns a <em >std::pair&lt;std::string,
DataType&gt; (const) &amp;</em>. This is usually what you want, but now assume we want to
display the map's contents, sorted by its keys. Sorting can simply be
performed by defining a support vector containing pointers to the elements in
the map, and then sorting the strings the pointers point at.
<p>
<em >PtrIter</em> is a tool that can be used to construct such a support vector, as
shown in the <strong >EXAMPLE</strong> section.
<p>
<em >PtrIter</em> is a class template requiring one template type parameter:
<em >Iterator</em>, the iterator's type (e.g., <em >vector&lt;string&gt;::iterator</em>)
<p>
<em >PtrIter</em>'s users don't have to specify <em >PtrIter</em>'s template type. The
function template <em >ptrIter</em>, when provided with an iterator returns the
matching <em >PtrIter</em> object.
<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>
    <em >std::iterator&lt;std::input_iterator_tag, ...&gt;</em>
<p>
<h2 >FREE FUNCTION</h2>
    <ul>
    <li> <strong >PtrIter&lt;Iterator&gt; ptrIter(Iterator const &amp;iter)</strong>:<br/>
        this function template returns a <em >PtrIter</em> object for the function's
<em >Iterator</em> argument. This function template simplyfies the construction of a
<em >PtrIter</em> as no template parameters need to be specified (see also the
<strong >EXAMPLE</strong> section)
    </ul>
<p>
<h2 >CONSTRUCTORS</h2>
    <ul>
    <li> <strong >PtrIter(Iterator const &amp;iter)</strong>:<br/>
        The <em >iter</em> parameter must be initialized with an existing input
iterator, offering <em >operator*, operator++, operator==</em> and <em >operator!=</em>.
As <em >PtrIter</em> is a class template, its template type parameters must be
specified when defining a <em >PtrIter</em> object. E.g.,
        <pre>

    PtrIter&lt;set&lt;string&gt;::iterator&gt; PtrIter(mySet.begin());
    
</pre>

        </ul>
    The copy and move constructors are available.
<p>
<h2 >OVERLOADED OPERATORS</h2>
    <ul>
    <li> <strong >PtrType operator*() const</strong>:<br/>
        the address of the entity the iterator refers to is returned;
    <li> <strong >PtrIter &amp;operator++()</strong>:<br/>
        the iterator is (pre)incremented to the next position;
    <li> <strong >bool operator==(PtrIter const &amp;other) const</strong>:<br/>
        <em >true</em> is returned if the two iterators are equal;
    <li> <strong >bool operator!=(PtrIter const &amp;other) const</strong>:<br/>
        <em >true</em> is returned if the two iterators are unequal;
    </ul>
    The copy and move assignment operators are available.
<p>
<h2 >DEFINED TYPE</h2>
    <em >PtrIter</em> defines the following type:
    <ul>   
    <li> <strong >typedef decltype(&amp;*Iterator()) PtrType</strong>:<br/>
    </ul>
<p>
<h2 >MEMBER FUNCTIONS</h2>
     All members of <em >std::iterator&lt;std:::input_iterator_tag, ...&gt;</em> are
available, as <strong >FBB::PtrIter</strong> inherits from this class.
<p>
<h2 >EXAMPLE</h2>
    <pre >
#include &lt;algorithm&gt;
#include &lt;unordered_map&gt;
#include &lt;vector&gt;
#include &lt;cstring&gt;
#include &lt;iostream&gt;

#include &lt;bobcat/ptriter&gt;

using namespace std;
using namespace FBB;

int main()
{
    cout &lt;&lt; "Enter lines, the first word will be the map's key; "
                                            "^D when done.\n";

    string key;
    string line;                    
    unordered_map&lt;string, string&gt; map;
    while (cin &gt;&gt; key &amp;&amp; getline(cin, line))    // fill the map
        map[key] = line;
    cout &lt;&lt; '\n';

                                        // initialize a support
    vector&lt;decltype(&amp;*map.begin())&gt;     // vector, using ptrIter
        support(ptrIter(map.begin()), ptrIter(map.end()));

                                        // sort 'support'
    typedef unordered_map&lt;string, string&gt;::value_type VT;
    sort(support.begin(), support.end(), 
        [&amp;](VT const *p1, VT const *p2)
        {
            return strcasecmp(p1-&gt;first.c_str(), p2-&gt;first.c_str()) &lt; 0;
        }
    );

    for(auto &amp;element: support)         // display sorted by key
        cout &lt;&lt; element-&gt;first &lt;&lt; ' ' &lt;&lt; element-&gt;second &lt;&lt; '\n';
}






</pre>

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

<h2 >DISTRIBUTION FILES</h2>
    <ul>
    <li> <em >bobcat_4.08.02-x.dsc</em>: detached signature;
    <li> <em >bobcat_4.08.02-x.tar.gz</em>: source archive;
    <li> <em >bobcat_4.08.02-x_i386.changes</em>: change log;
    <li> <em >libbobcat1_4.08.02-x_*.deb</em>: debian package holding the
            libraries;
    <li> <em >libbobcat1-dev_4.08.02-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>
</body>
</html>

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