With this object, you can use a regular C binary function as a binary function object. When executed, a pointer_to_binary_function object returns the result of executing the regular C function with two operands. Use the associated adapter function ptr_fun() to conveniently construct a pointer_to_binary_function object directly from a C binary function.

Declaration


  
#include <functional>

template< class Arg1, class Arg2, class Result >
class pointer_to_binary_function : public binary_function< Arg1, Arg2, Result >

Interface

Constructor

explicit pointer_to_binary_function( Result( * f ( Arg1, Arg2))

Constructs a binary function object with an associated function f .

()

Result operator()( const Arg1& x , const Arg2& y ) const

Returns f ( x , y ) .

Example <ospace/osstd/examples/ptrbinf1.cpp>


    #include <algorithm>
#include <functional>

int input1[ 4 ] = { 7, 2, 3, 5 };
int input2[ 4 ] = { 1, 5, 5, 8 };

int
sum( int x_, int y_ )
  {
  return x_ + y_;
  }

void
main()
  {
  int output[ 4 ];
  transform
    (
    input1,
    input1 + 4,
    input2,
    output,
    pointer_to_binary_function< int, int, int >( sum )
    );

  for ( int i = 0; i < 4; ++i )
    cout << output[ i ] << "\n";
  }

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Example <ospace/osstd/examples/ptrbinf2.cpp>


    #include <iostream>
#include <algorithm>
#include <functional>

int input1[ 4 ] = { 7, 2, 3, 5 };
int input2[ 4 ] = { 1, 5, 5, 8 };

int
sum( int x_, int y_ )
  {
  return x_ + y_;
  }

void
main()
  {
  int output[ 4 ];

  transform( input1, input1 + 4, input2, output, ptr_fun( sum ) );

  for ( int i = 0; i < 4; ++i )
    cout << output[ i ] << "\n";
  }

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pointer_to_binary_function, ptr_fun

Library

Declaration

Adaptor

Interface

Example <ospace/osstd/examples/ptrbinf1.cpp>

Example <ospace/osstd/examples/ptrbinf2.cpp>