Sub.h

#ifndef Sub_h
#define Sub_h
#include "Function.h"
 
namespace cart
{
    template <class T>
    class Sub : public Function
    {
    public:
        Sub();
        Sub(uint numArgs);
        ~Sub();
 
        void evaluate(voidP inputs, void* result);
    };
 
    typedef Sub<double> SubDouble;
    typedef Sub<int> SubInt;
 
    template <class T>
    Sub<T>::Sub()
    {
        name_ = "-";
        numOfArgs_ = 2;
    }
 
    template <class T>
    Sub<T>::Sub(uint numArgs)
    {
        name_ = "-";
        numOfArgs_ = numArgs;
    }
 
    template <class T>
    Sub<T>::~Sub()
    {
    }
 
    template <class T>
    void Sub<T>::evaluate(voidP inputs, void* result)
    {
        T& diff = *(T*) result;
        stringstream ss;
        ss << *((string*) inputs.get());
        vector<T> readInputs;
        T input;
        uint i = 0;
        while (ss >> input)
        {
            readInputs.push_back(input);
            ++i;
            if (i == numOfArgs_)
            {
                break;
            }
        }
 
        diff = readInputs.at(0);
        for (int i = 1; i < (int)numOfArgs_; i++)
        {
            diff -= readInputs.at(i);
        }
    }
 
}
 
#endif /* Sub_h */