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<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>FBB::Ranger</title>
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<link rev="made" href="mailto:Frank B. Brokken: f.b.brokken@rug.nl">
</head>
<body text="#27408B" bgcolor="#FFFAF0">
<hr/>
<h1 id="title">FBB::Ranger</h1>
<h2 id="author">libbobcat-dev_4.04.00-x.tar.gz</h2>
<h2 id="date">2005-2016</h2>

<!DOCTYPE html><html><head>
<meta charset="UTF-8">
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    img {vertical-align: center;}
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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">
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<h1 id="title"></h1>

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<meta charset="UTF-8">
<title>FBB::Ranger(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::Ranger(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::Ranger - generalizes ranges for range-based for-loops
<p>
<h2 >SYNOPSIS</h2>
    <strong >#include &lt;bobcat/ranger&gt;</strong><br/>
<p>
<h2 >DESCRIPTION</h2>
<p>
The <em >Ranger</em> class template defines ranges that can be used with range-based
for-loops. The standard range-based for-loop requires for its
range-specificiation an array or an iterator range as offered by, e.g.,
containers (through their <em >begin</em> and <em >end</em> members). Ranges defined by a
pair of pointers or by a subrange defined by iterator expressions cannot
currently be used in combination with range-based for-loops. 
<p>
<em >Ranger</em> extends the applicability of range-based for-loops by turning pairs
of pointers, an initial pointer and a pointer count, or a pair of iterators
into a range that can be used by range-based for-loops.
<p>
<em >Ranger</em> is a class template requiring one template type parameter:
<em >Iterator</em>, an iterator or pointer type reaching the data when dereferenced.
<p>
<em >Ranger</em>'s users don't have to specify <em >Ranger</em>'s template type. The
function template <em >ranger</em> returns the appropriate <em >Ranger</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 >FREE FUNCTION</h2>
    When using the following free functions, any (subrange) of iterators or
pointers can be used. With iterators subranges of <em >reverse iterators</em> can
also be specified. The <strong >EXAMPLE</strong> section below illustrates the use of the
<em >ranger</em> function templates.
    <ul>
    <li> <strong >Ranger&lt;Iterator&gt; ranger(Iterator &amp;&amp;begin, Iterator &amp;&amp;end)</strong>:<br/>
        this function template returns a <em >Ranger</em> object for the (sub)range
        defined by two (reverse) iterators;
    <li> <strong >Ranger&lt;Iterator&gt; ranger(Iterator &amp;&amp;begin, size_t count)</strong>:<br/>
        this function template returns a <em >Ranger</em> object for the (sub)range
        defined by the (reverse) iterator range <em >begin</em> and <em >begin +
        count</em>;
    <li> <strong >Ranger&lt;Data *&gt; ranger(Data *begin, Data *end)</strong>:<br/>
        this function template returns a <em >Ranger</em> object for the (sub)range
        defined by the two pointers <em >begin</em> and <em >end</em>;
    <li> <strong >Ranger&lt;Data *&gt; ranger(Data *begin, size_t count)</strong>:<br/>
        this function template returns a <em >Ranger</em> object for the (sub)range
        defined by the two pointers <em >begin</em> and <em >begin + count</em>. 
    </ul>
<p>
<h2 >CONSTRUCTORS</h2>
    Below, <em >Iterator</em> refers to the <em >Ranger</em> class template's type
parameter. Although named 'Iterator' it can also be a pointer to some data
type (e.g., <em >std::string *</em>).
    <ul>
    <li> <strong >Ranger(Iterator const &amp;begin, Iterator const &amp;end)</strong>:<br/>
        A <em >Ranger</em> object can be passed as range-specifier in a range-based
for-loop. All elements defined by the range will subsequently be visited by
the range-based for-loop.
    </ul>
    The copy and move constructors are available.
<p>
<h2 >OVERLOADED OPERATORS</h2>
    The copy and move assignment operators are available.
<p>
<h2 >MEMBER FUNCTIONS</h2>
    <ul>
    <li> <strong >Iterator const &amp;begin() const</strong>:<br/>
        returns (a copy of) the <em >begin</em> iterator passed to the <em >Ranger</em>'s
constructor. Note that if <em >Iterator</em> was a pointer type (like <em >int *</em>) the
data to which the iterator returned by <em >begin()</em> can actually be modified,
as the member's return type (using <em >int *</em> for <em >Iterator</em>) becomes <em >int
* const &amp;</em>, so a reference to a constant pointer to an <em >int</em>. This is
perfectly OK: if the data themselves should be immutable, then the data type
must be defined as <em >int const</em>, which is automatically the case when passing
<em >int const *</em> data. See the <strong >EXAMPLE</strong> section for an illustration.
    <li> <strong >Iterator const &amp;end() const</strong>:<br/>
        returns (a copy of) the <em >end</em> iterator passed to the <em >Ranger</em>'s
constructor. 
    </ul>
    If reverse iterators are passed to <em >Ranger</em>'s constructor, then 
    the <em >begin</em> and <em >end</em> members return <em >reverse iterators</em>. Since 
the intended use of <em >Ranger</em> objects is to define a range for range-base
for-loops, members like <em >rbegin</em> and <em >rend</em> can be omitted from
<em >Ranger</em>.
<p>
<h2 >EXAMPLE</h2>
    <pre >
#include &lt;vector&gt;
#include &lt;iostream&gt;

#include &lt;bobcat/ranger&gt;

using namespace std;
using namespace FBB;

int main()
{
    vector&lt;int&gt; iv {1, 2, 3, 4, 5};
                                    // display and modify a subrange
    for(auto &amp;el: ranger(iv.rbegin() + 1, iv.rend() - 1))
        cout &lt;&lt; el++ &lt;&lt; ' ';
    cout &lt;&lt; '\n';
                                    // display a reversed range
    for(auto &amp;el: ranger(iv.rbegin() + 1, iv.rend() - 1))
        cout &lt;&lt; el &lt;&lt; ' ';
    cout &lt;&lt; '\n';
                                    // same: display using a count
    for(auto &amp;el: ranger(iv.rbegin() + 1, 3))
        cout &lt;&lt; el &lt;&lt; ' ';
    cout &lt;&lt; '\n';

    int intArray[] = {1, 2, 3, 4, 5};  
                                    // display and modify elements 
                                    // in a pointer-based range
    for(auto &amp;el: ranger(intArray + 1, intArray + 3))
        cout &lt;&lt; el++ &lt;&lt; ' ';
    cout &lt;&lt; '\n';
                                    // data now modified
    for(auto &amp;el: ranger(intArray + 1, intArray + 3))
        cout &lt;&lt; el &lt;&lt; ' ';
    cout &lt;&lt; '\n';
                                    // using a count rather than an
                                    // end-pointer
    for(auto &amp;el: ranger(intArray + 1, 3))
        cout &lt;&lt; el &lt;&lt; ' ';
    cout &lt;&lt; '\n';

    int const constInts[] = {1, 2, 3, 4, 5};

                                    // data can't be modified
    for(auto &amp;el: ranger(constInts + 1, constInts + 3))
        cout &lt;&lt; el &lt;&lt; ' ';
    cout &lt;&lt; '\n';
}

</pre>

<p>
<h2 >FILES</h2>
    <em >bobcat/ranger</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_4.04.00-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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