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binary-function-struct.md

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descriptiontitlems.datef1_keywordshelpviewer_keywordsms.assetid
Learn more about: binary_function Struct
binary_function Struct
02/21/2019
functional/std::binary_function
binary_function class
79b6d53d-644c-4add-b0ba-3a5f40f69c60

binary_function Struct

An empty base struct that defines types that may be inherited by derived classes that provides a binary function object. Deprecated in C++11, removed in C++17.

Syntax

structbinary_function { typedef Arg1 first_argument_type; typedef Arg2 second_argument_type; typedef Result result_type; };

Remarks

The template struct serves as a base for classes that define a member function of the form:

result_type ** operator()(const** first_argument_type&, constsecond_argument_type&) const

All such binary functions can refer to their first argument type as first_argument_type, their second argument type as second_argument_type, and their return type as result_type.

Example

// functional_binary_function.cpp// compile with: /EHsc #include<vector> #include<functional> #include<algorithm> #include<iostream>usingnamespacestd;template <classType> classaverage: binary_function<Type, Type, Type> { public: result_type operator( ) ( first_argument_type a, second_argument_type b ) { return (result_type) ( ( a + b ) / 2 ); } }; intmain( ) { vector <double> v1, v2, v3 ( 6 ); vector <double>::iterator Iter1, Iter2, Iter3; for ( int i = 1 ; i <= 6 ; i++ ) v1.push_back( 11.0 / i ); for ( int j = 0 ; j <= 5 ; 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 averages of the elements of v1 & v2transform ( v1.begin( ), v1.end( ), v2.begin( ), v3.begin ( ), average<double>( ) ); cout << "The element-wise averages are: ( " ; for ( Iter3 = v3.begin( ) ; Iter3 != v3.end( ) ; Iter3++ ) cout << *Iter3 << ""; cout << ")" << endl; }
The vector v1 = ( 11 5.5 3.66667 2.75 2.2 1.83333 ) The vector v2 = ( -0 -2 -4 -6 -8 -10 ) The element-wise averages are: ( 5.5 1.75 -0.166667 -1.625 -2.9 -4.08333 )
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