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<html><!-- Created using the cpp_pretty_printer from the dlib C++ library.  See http://dlib.net for updates. --><head><title>dlib C++ Library - sample_pair_abstract.h</title></head><body bgcolor='white'><pre>
<font color='#009900'>// Copyright (C) 2010  Davis E. King ([email protected])
</font><font color='#009900'>// License: Boost Software License   See LICENSE.txt for the full license.
</font><font color='#0000FF'>#undef</font> DLIB_SAMPLE_PaIR_ABSTRACT_Hh_
<font color='#0000FF'>#ifdef</font> DLIB_SAMPLE_PaIR_ABSTRACT_Hh_

<font color='#0000FF'>#include</font> <font color='#5555FF'>&lt;</font>limits<font color='#5555FF'>&gt;</font>
<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='../serialize.h.html'>../serialize.h</a>"

<font color='#0000FF'>namespace</font> dlib
<b>{</b>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'>class</font> <b><a name='sample_pair'></a>sample_pair</b> 
    <b>{</b>
        <font color='#009900'>/*!
            WHAT THIS OBJECT REPRESENTS
                This object is intended to represent an edge in an undirected graph 
                which has data samples at its vertices.  So it contains two integers
                (index1 and index2) which represent the identifying indices of 
                the samples at the ends of an edge.  Note that this object enforces
                the constraint that index1 &lt;= index2.  This has the effect of 
                making the edges undirected since a sample_pair is incapable
                of representing a single edge in more than one way.  That is,
                sample_pair(i,j) == sample_pair(j,i) for any value of i and j.

                This object also contains a double which can be used for any purpose.
        !*/</font>

    <font color='#0000FF'>public</font>:
        <b><a name='sample_pair'></a>sample_pair</b><font face='Lucida Console'>(</font>
        <font face='Lucida Console'>)</font>;
        <font color='#009900'>/*!
            ensures
                - #index1() == 0
                - #index2() == 0
                - #distance() == 1 
        !*/</font>

        <b><a name='sample_pair'></a>sample_pair</b> <font face='Lucida Console'>(</font>
            <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> idx1,
            <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> idx2
        <font face='Lucida Console'>)</font>;
        <font color='#009900'>/*!
            ensures
                - #index1() == min(idx1,idx2)
                - #index2() == max(idx1,idx2)
                - #distance() == 1 
        !*/</font>

        <b><a name='sample_pair'></a>sample_pair</b> <font face='Lucida Console'>(</font>
            <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> idx1,
            <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font> idx2,
            <font color='#0000FF'>const</font> <font color='#0000FF'><u>double</u></font> dist
        <font face='Lucida Console'>)</font>;
        <font color='#009900'>/*!
            ensures
                - #index1() == min(idx1,idx2)
                - #index2() == max(idx1,idx2)
                - #distance() == dist
        !*/</font>

        <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font><font color='#5555FF'>&amp;</font> <b><a name='index1'></a>index1</b> <font face='Lucida Console'>(</font>
        <font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>; 
        <font color='#009900'>/*!
            ensures
                - returns the first index value stored in this object 
        !*/</font>

        <font color='#0000FF'>const</font> <font color='#0000FF'><u>unsigned</u></font> <font color='#0000FF'><u>long</u></font><font color='#5555FF'>&amp;</font> <b><a name='index2'></a>index2</b> <font face='Lucida Console'>(</font>
        <font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>; 
        <font color='#009900'>/*!
            ensures
                - returns the second index value stored in this object 
        !*/</font>

        <font color='#0000FF'>const</font> <font color='#0000FF'><u>double</u></font><font color='#5555FF'>&amp;</font> <b><a name='distance'></a>distance</b> <font face='Lucida Console'>(</font>
        <font face='Lucida Console'>)</font> <font color='#0000FF'>const</font>;
        <font color='#009900'>/*!
            ensures
                - returns the floating point number stored in this object
        !*/</font>

    <b>}</b>;

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'>template</font> <font color='#5555FF'>&lt;</font><font color='#0000FF'>typename</font> T<font color='#5555FF'>&gt;</font>
    <font color='#0000FF'><u>bool</u></font> <b><a name='order_by_index'></a>order_by_index</b> <font face='Lucida Console'>(</font>
        <font color='#0000FF'>const</font> T<font color='#5555FF'>&amp;</font> a,
        <font color='#0000FF'>const</font> T<font color='#5555FF'>&amp;</font> b
    <font face='Lucida Console'>)</font> <b>{</b> <font color='#0000FF'>return</font> a.<font color='#BB00BB'>index1</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&lt;</font> b.<font color='#BB00BB'>index1</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>|</font><font color='#5555FF'>|</font> <font face='Lucida Console'>(</font>a.<font color='#BB00BB'>index1</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>=</font><font color='#5555FF'>=</font> b.<font color='#BB00BB'>index1</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font> a.<font color='#BB00BB'>index2</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&lt;</font> b.<font color='#BB00BB'>index2</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>; <b>}</b>
    <font color='#009900'>/*!
        requires
            - T is a type with an interface compatible with sample_pair.
        ensures
            - provides a total ordering of sample_pair objects that will cause pairs that are 
              equal to be adjacent when sorted.  So for example, this function can be used
              with std::sort() to first sort a sequence of sample_pair objects and then
              find duplicate edges.
    !*/</font>

    <font color='#0000FF'>template</font> <font color='#5555FF'>&lt;</font><font color='#0000FF'>typename</font> T<font color='#5555FF'>&gt;</font>
    <font color='#0000FF'><u>bool</u></font> <b><a name='order_by_distance'></a>order_by_distance</b> <font face='Lucida Console'>(</font>
        <font color='#0000FF'>const</font> T<font color='#5555FF'>&amp;</font> a,
        <font color='#0000FF'>const</font> T<font color='#5555FF'>&amp;</font> b
    <font face='Lucida Console'>)</font> <b>{</b> <font color='#0000FF'>return</font> a.<font color='#BB00BB'>distance</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&lt;</font> b.<font color='#BB00BB'>distance</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>; <b>}</b>
    <font color='#009900'>/*!
        requires
            - T is a type with an interface compatible with sample_pair.
        ensures
            - provides a total ordering of sample_pair objects that causes pairs with 
              smallest distance to be the first in a sorted list.  This function can be
              used with std::sort().
    !*/</font>

    <font color='#0000FF'>template</font> <font color='#5555FF'>&lt;</font><font color='#0000FF'>typename</font> T<font color='#5555FF'>&gt;</font>
    <font color='#0000FF'><u>bool</u></font> <b><a name='order_by_descending_distance'></a>order_by_descending_distance</b> <font face='Lucida Console'>(</font>
        <font color='#0000FF'>const</font> T<font color='#5555FF'>&amp;</font> a,
        <font color='#0000FF'>const</font> T<font color='#5555FF'>&amp;</font> b
    <font face='Lucida Console'>)</font> <b>{</b> <font color='#0000FF'>return</font> a.<font color='#BB00BB'>distance</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&gt;</font> b.<font color='#BB00BB'>distance</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font>; <b>}</b>
    <font color='#009900'>/*!
        requires
            - T is a type with an interface compatible with sample_pair.
        ensures
            - provides a total ordering of sample_pair objects that causes pairs with 
              largest distance to be the first in a sorted list.  This function can be
              used with std::sort().
    !*/</font>

    <font color='#0000FF'>template</font> <font color='#5555FF'>&lt;</font><font color='#0000FF'>typename</font> T<font color='#5555FF'>&gt;</font>
    <font color='#0000FF'><u>bool</u></font> <b><a name='order_by_distance_and_index'></a>order_by_distance_and_index</b> <font face='Lucida Console'>(</font>
        <font color='#0000FF'>const</font> T<font color='#5555FF'>&amp;</font> a,
        <font color='#0000FF'>const</font> T<font color='#5555FF'>&amp;</font> b
    <font face='Lucida Console'>)</font> <b>{</b> <font color='#0000FF'>return</font> a.<font color='#BB00BB'>distance</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&lt;</font> b.<font color='#BB00BB'>distance</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>|</font><font color='#5555FF'>|</font> <font face='Lucida Console'>(</font>a.<font color='#BB00BB'>distance</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>=</font><font color='#5555FF'>=</font> b.<font color='#BB00BB'>distance</font><font face='Lucida Console'>(</font><font face='Lucida Console'>)</font> <font color='#5555FF'>&amp;</font><font color='#5555FF'>&amp;</font> <font color='#BB00BB'>order_by_index</font><font face='Lucida Console'>(</font>a,b<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>; <b>}</b>
    <font color='#009900'>/*!
        requires
            - T is a type with an interface compatible with sample_pair.
        ensures
            - provides a total ordering of sample_pair objects that causes pairs with
              smallest distance to be the first in a sorted list but also orders samples
              with equal distances according to order_by_index().  This function can be
              used with std::sort().
    !*/</font>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'>inline</font> <font color='#0000FF'><u>bool</u></font> <b><a name='operator'></a>operator</b> <font color='#5555FF'>=</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>
        <font color='#0000FF'>const</font> sample_pair<font color='#5555FF'>&amp;</font> a,
        <font color='#0000FF'>const</font> sample_pair<font color='#5555FF'>&amp;</font> b
    <font face='Lucida Console'>)</font>;
    <font color='#009900'>/*!
        ensures
            - returns a.index1() == b.index1() &amp;&amp; a.index2() == b.index2();
              I.e. returns true if a and b both represent the same pair and false otherwise.  
              Note that the distance field is not involved in this comparison.
    !*/</font>

    <font color='#0000FF'>inline</font> <font color='#0000FF'><u>bool</u></font> <b><a name='operator'></a>operator</b> <font color='#5555FF'>!</font><font color='#5555FF'>=</font> <font face='Lucida Console'>(</font>
        <font color='#0000FF'>const</font> sample_pair<font color='#5555FF'>&amp;</font> a,
        <font color='#0000FF'>const</font> sample_pair<font color='#5555FF'>&amp;</font> b
    <font face='Lucida Console'>)</font>;
    <font color='#009900'>/*!
        ensures
            - returns !(a == b)
    !*/</font>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
    <font color='#0000FF'>inline</font> <font color='#0000FF'><u>void</u></font> <b><a name='serialize'></a>serialize</b> <font face='Lucida Console'>(</font>
        <font color='#0000FF'>const</font> sample_pair<font color='#5555FF'>&amp;</font> item,
        std::ostream<font color='#5555FF'>&amp;</font> out
    <font face='Lucida Console'>)</font>;
    <font color='#009900'>/*!
        provides serialization support 
    !*/</font>

    <font color='#0000FF'>inline</font> <font color='#0000FF'><u>void</u></font> <b><a name='deserialize'></a>deserialize</b> <font face='Lucida Console'>(</font>
        sample_pair<font color='#5555FF'>&amp;</font> item,
        std::istream<font color='#5555FF'>&amp;</font> in 
    <font face='Lucida Console'>)</font>;
    <font color='#009900'>/*!
        provides deserialization support 
    !*/</font>

<font color='#009900'>// ----------------------------------------------------------------------------------------
</font>
<b>}</b>

<font color='#0000FF'>#endif</font> <font color='#009900'>// DLIB_SAMPLE_PaIR_ABSTRACT_Hh_
</font>


</pre></body></html>