BinaryOperator<>

BinaryOperator<> is a template class in C++ that represents a binary operator, which is an operator that takes two operands. The template parameter represents the type of the operands and the return type of the operator.

For example, the following code defines a BinaryOperator template class for addition:

template<typename T>
class BinaryOperator {
public:
    T operator()(T a, T b) const {
        return a + b;
    }
};

Here, the template parameter T represents the type of the operands and the return type of the operator. The operator() function takes two operands of type T and returns their sum.

We can use the BinaryOperator template class to define a binary operator for any type, like so:

BinaryOperator<int> add;
int result = add(2, 3); // result = 5

Here, we create an instance of the BinaryOperator template class for the int type, and use it to add two integers. The result is 5.

In summary, BinaryOperator<> is a template class in C++ that allows us to define binary operators for any type.