divides Struct

 

A predefined function object that performs the division operation (operator/) on its arguments.

template<class Type = void>
   struct divides : public binary_function <Type, Type, Type> 
   {
      Type operator()(
         const Type& Left, 
         const Type& Right 
         ) const;
   };

// specialized transparent functor for operator/
template<>
   struct divides<void>
   {
      template<class Type1, class Type2>
      auto operator()(Type1&& Left, Type2&& Right) const
         -> decltype(std::forward<Type1>(Left)
            / std::forward<Type2>(Right));
   };

Type, Type1, Type2

A type that supports an operator/ that takes operands of the specified or inferred types.

Left

The left operand of the division operation. The unspecialized template takes an lvalue reference argument of type Type. The specialized template does perfect forwarding of lvalue and rvalue reference arguments of inferred type Type1.

Right

The right operand of the division operation. The unspecialized template takes an lvalue reference argument of type Type. The specialized template does perfect forwarding of lvalue and rvalue reference arguments of inferred type Type2.

The result of Left / Right. The specialized template does perfect forwarding of the result, which has the type that's returned by operator/.

Example

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

using namespace std;

int main( )
{
   vector <double> v1, v2, v3 (6);
   vector <double>::iterator Iter1, Iter2, Iter3;

   int i;
   for ( i = 0 ; i <= 5 ; i++ )
   {
      v1.push_back( 7.0 * i );
   }

   int j;
   for ( j = 1 ; j <= 6 ; j++ )
   {
      v2.push_back( 2.0 * j);
   }

   cout << "The vector v1 = ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")" << endl;

   cout << "The vector v2 = ( " ;
   for ( Iter2 = v2.begin( ) ; Iter2 != v2.end( ) ; Iter2++ )
      cout << *Iter2 << " ";
   cout << ")" << endl;

   // Finding the element-wise quotients of the elements of v1 & v2
   transform ( v1.begin( ), v1.end( ), v2.begin( ), v3.begin ( ), 
      divides<double>( ) );

   cout << "The element-wise quotients are: ( " ;
   for ( Iter3 = v3.begin( ) ; Iter3 != v3.end( ) ; Iter3++ )
      cout << *Iter3 << " ";
   cout << ")" << endl;
}
The vector v1 = ( 0 7 14 21 28 35 )
The vector v2 = ( 2 4 6 8 10 12 )
The element-wise quotients are: ( 0 1.75 2.33333 2.625 2.8 2.91667 )

Requirements

Header: <functional>

Namespace: std

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