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less Struct

A binary predicate that tests whether a value of a specified type is less than another value of that type.

template<class Type> 
   struct less : public binary_function <Type, Type, bool>  
   { 
      bool operator()( 
         const Type& _Left,  
         const Type& _Right 
      ) const; 
   };

_Left

The left operand of type Type in the inequality to be tested.

_Right

The right operand of type Type in the inequality to be tested.

true if _Left < _Right; false if _Left >= _Right.

The binary predicate less<Type> provides a strict weak ordering of a set of element values of type Type into equivalence classes if and only if this Type satisfies the standard mathematical requirements for being so ordered. The specializations for any pointer type yield a total ordering of elements in that all elements of distinct values are ordered with respect to each other.

// functional_less.cpp
// compile with: /EHsc
#include <vector>
#include <algorithm>
#include <functional>
#include <iostream>

struct MyStruct {
   MyStruct(int i) : m_i(i){}
   
   bool operator < (const MyStruct & rhs) const {
      return m_i < rhs.m_i;
   }   

   int m_i;
};

int main() {
   using namespace std;
   vector <MyStruct> v1;
   vector <MyStruct>::iterator Iter1;
   vector <MyStruct>::reverse_iterator rIter1;

   int i;
   for ( i = 0 ; i < 7 ; i++ )     
       v1.push_back( MyStruct(rand()));

   cout << "Original vector v1 = ( " ;
   for ( Iter1 = v1.begin() ; Iter1 != v1.end() ; Iter1++ ) 
cout << Iter1->m_i << " ";
   cout << ")" << endl;

   // To sort in ascending order,
   sort( v1.begin( ), v1.end( ), less<MyStruct>());

   cout << "Sorted vector v1 = ( " ;
   for ( Iter1 = v1.begin() ; Iter1 != v1.end() ; Iter1++ ) 
cout << Iter1->m_i << " ";
   cout << ")" << endl;
 }

Original vector v1 = ( 41 18467 6334 26500 19169 15724 11478 )
Sorted vector v1 = ( 41 6334 11478 15724 18467 19169 26500 )

Header: <functional>

Namespace: std

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