equal_to (STL/CLR)

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

Microsoft Visual Studio 2010/.NET Framework 4.0

Visual C++ Libraries

equal_to (STL/CLR)

The template class describes a functor that, when called, returns true only if the first argument is equal to the second. You use it specify a function object in terms of its argument type.

template<typename Arg>
    ref class equal_to
    { // wrap operator()
public:
    typedef Arg first_argument_type;
    typedef Arg second_argument_type;
    typedef bool result_type;
    typedef Microsoft::VisualC::StlClr::BinaryDelegate<
        first_argument_type, second_argument_type, result_type>
        delegate_type;

    equal_to();
    equal_to(equal_to<Arg>% right);

    result_type operator()(first_argument_type left,
        second_argument_type right);
    operator delegate_type^();
    };

Parameters

Arg: The type of the arguments.

Member Functions

Type Definition	Description
delegate_type	The type of the generic delegate.
first_argument_type	The type of the functor first argument.
result_type	The type of the functor result.
second_argument_type	The type of the functor second argument.

Member	Description
equal_to	Constructs the functor.

Operator	Description
operator()	Computes the desired function.
operator delegate_type^()	Casts the functor to a delegate.

Remarks

The template class describes a two-argument functor. It defines the member operator operator() so that, when the object is called as a function, it returns true only if the first argument is equal to the second.

You can also pass the object as a function argument whose type is delegate_type^ and it will be converted appropriately.

Example

// cliext_equal_to.cpp 
// compile with: /clr 
#include <cliext/algorithm> 
#include <cliext/functional> 
#include <cliext/vector> 
 
typedef cliext::vector<int> Myvector; 
int main() 
    { 
    Myvector c1; 
    c1.push_back(4); 
    c1.push_back(3); 
    Myvector c2; 
    c2.push_back(4); 
    c2.push_back(4); 
    Myvector c3(2, 0); 
 
// display initial contents " 4 3" and " 4 4" 
    for each (int elem in c1) 
        System::Console::Write(" {0}", elem); 
    System::Console::WriteLine(); 
 
    for each (int elem in c2) 
        System::Console::Write(" {0}", elem); 
    System::Console::WriteLine(); 
 
// transform and display 
    cliext::transform(c1.begin(), c1.begin() + 2, 
        c2.begin(), c3.begin(), cliext::equal_to<int>()); 
    for each (int elem in c3) 
        System::Console::Write(" {0}", elem); 
    System::Console::WriteLine(); 
    return (0); 
    }

 4 3
 4 4
 1 0

Requirements

Header: <cliext/functional>

Namespace: cliext

Reference

not_equal_to (STL/CLR)