binder2nd (STL/CLR)
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The latest version of this topic can be found at binder2nd (STL/CLR).
The template class describes a one-argument functor that, when called, returns its stored two-argument functor called with the supplied first argument and its stored second argument. You use it specify a function object in terms of its stored functor.
Syntax
template<typename Fun>
ref class binder2nd
{ // wrap operator()
public:
typedef Fun stored_function_type;
typedef typename Fun::first_argument_type first_argument_type;
typedef typename Fun::second_argument_type second_argument_type;
typedef typename Fun:result_type result_type;
typedef Microsoft::VisualC::StlClr::UnaryDelegate<
first_argument_type, result_type>
delegate_type;
binder2nd(Fun% functor, second_argument_type left);
binder2nd(binder2nd<Arg>% right);
result_type operator()(first_argument_type right);
operator delegate_type^();
};
Parameters
Fun
The type of the stored functor.
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. |
| stored_function_type | The type of the functor. |
| Member | Description |
|---|---|
| binder2nd | 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 one-argument functor that stores a two-argument functor and a second argument. It defines the member operator operator() so that, when the object is called as a function, it returns the result of calling the stored functor with the supplied first argument and the stored second argument.
You can also pass the object as a function argument whose type is delegate_type^ and it will be converted appropriately.
Example
// cliext_binder2nd.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 c3(2, 0);
// display initial contents " 4 3"
for each (int elem in c1)
System::Console::Write(" {0}", elem);
System::Console::WriteLine();
// transform and display
cliext::minus<int> sub_op;
cliext::binder2nd<cliext::minus<int> > sub4(sub_op, 4);
cliext::transform(c1.begin(), c1.begin() + 2, c3.begin(),
sub4);
for each (int elem in c3)
System::Console::Write(" {0}", elem);
System::Console::WriteLine();
// transform and display with function
cliext::transform(c1.begin(), c1.begin() + 2, c3.begin(),
bind2nd(sub_op, 4));
for each (int elem in c3)
System::Console::Write(" {0}", elem);
System::Console::WriteLine();
return (0);
}
4 3
0 -1
0 -1
Requirements
Header: <cliext/functional>
Namespace: cliext