greater

Library:  General utilities

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A binary function object that returns true if its first argument is greater than its second

#include <functional>

namespace std { 
  template <class T> 
  struct greater; 
}

greater is a binary function object. Its operator() returns true if x is greater than y. You can pass a greater object to any algorithm that requires a binary function. For example, the sort() algorithm can accept a binary function as an alternate comparison object to sort a sequence. greater would be used in that algorithm in the following manner:

vector<int> vec1;
.
.
sort(vec1.begin(), vec1.end(),greater<int>());

After this call to sort(), vec1 is sorted in descending order.

namespace std {
  template <class T>
  struct greater : binary_function<T, T, bool> {
    bool operator()(const T&, const T&) const;
  };
}

Function Objects

ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.3