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greater [C++ Reference]
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<h1><a name="greater" id="greater">greater</a></h1>
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<h5><a name="template_class_t_struct_greater" id="template_class_t_struct_greater">template <class T> struct greater;</a></h5>
<div class="level5">
<p>
Function object class for greater-than inequality comparison
</p>
<p>
This class defines function objects for the “greater than” inequality comparison operation.
</p>
<p>
Generically, function objects are instances of a class with member function operator() defined. This member function allows the object to be used with the same syntax as a regular function call, and therefore it can be used in templates instead of a pointer to a function.
</p>
<p>
greater has its operator() member defined such that it returns true if its first argument compares greater than the second one using operator>, and false otherwise.
</p>
<p>
This class is derived from binary_function and is defined as:
</p>
<pre class="code">template <class T> struct greater : binary_function <T,T,bool> {
bool operator() (const T& x, const T& y) const
{return x>y;}
};</pre>
<p>
Objects of this class can be used with some standard algorithms such as sort, merge or lower_bound.
</p>
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<h3><a name="members" id="members">**Members**</a></h3>
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<p>
T operator() (const T& x, const T& y)
Member function returning the result of the comparison x>y.
</p>
</div>
<h4><a name="greater_example" id="greater_example">// greater example</a></h4>
<div class="level4">
<pre class="c code c++" style="font-family:monospace;"><span class="co2">#include <iostream></span>
<span class="co2">#include <functional></span>
<span class="co2">#include <algorithm></span>
using namespace std<span class="sy0">;</span>
<span class="kw4">int</span> main <span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw4">int</span> numbers<span class="br0">[</span><span class="br0">]</span><span class="sy0">=</span><span class="br0">{</span>20<span class="sy0">,</span>40<span class="sy0">,</span>50<span class="sy0">,</span>10<span class="sy0">,</span>30<span class="br0">}</span><span class="sy0">;</span>
sort <span class="br0">(</span>numbers<span class="sy0">,</span> numbers<span class="sy0">+</span>5<span class="sy0">,</span> greater<span class="sy0"><</span>int<span class="sy0">></span><span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span><span class="sy0">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i<span class="sy0"><</span><span class="nu0">5</span><span class="sy0">;</span> i<span class="sy0">++</span><span class="br0">)</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> numbers<span class="br0">[</span>i<span class="br0">]</span> <span class="sy0"><<</span> <span class="st0">" "</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> endl<span class="sy0">;</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy0">;</span>
<span class="br0">}</span></pre>
<p>
Output:
</p>
<pre class="c code c++" style="font-family:monospace;"><span class="nu0">50</span> <span class="nu0">40</span> <span class="nu0">30</span> <span class="nu0">20</span> <span class="nu0">10</span></pre>
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