Fun with C++

[TomToad]

Been spending the last few days trying to relearn C++.  I messed around with it many years ago (back in the 90's), many things I've forgotten and many changes to the language.

Made this handy little class which stores two numbers in a range and interpolates between them by subscripting an array with a double.

Code Select Expand

#include <iostream>

class Range
{
private:
    double m_start, m_finish;

public:
    Range(double start, double finish) : m_start(start), m_finish(finish) {}

    double operator[](const double inter)
    {
        return (m_finish-m_start)*inter+m_start;
    }
};

int main()
{
    Range range(10,20);
    for(double i = 0.0;i <= 1.0; i += 0.1)
        std::cout << range[i] << ' ';

    std::cout << std::endl;

    Range range2(100,50);
    for(double i = 0.0; i <= 1.0; i += 0.1)
        std::cout << range2[i] << ' ';

    std::cout << std::endl;
}


[TomToad]

ok, now when you subscript range with an integer, [0] refers to the start value and [1] refers to the finish value. This way, you can get/set the values.  If range is subscripted with a double, then the return value is a linear interpolation between the two values.  I know this is probably abusing the overloading function, but it is interesting what you can do. 

Code Select Expand

#include <iostream>

class Range
{
private:
    double m_start, m_finish;

public:
    Range(double start, double finish) : m_start(start), m_finish(finish) {}

    double operator[](const double inter)
    {
        return (m_finish-m_start)*inter+m_start;
    }

    double& operator[](const int sub)
    {
        if (sub==0) return m_start;
        return m_finish;
    }
};

int main()
{
    Range range(10,20);
    std::cout << "start = " << range[0] << ", finish = " << range[1] << std::endl;
    for(double i = 0.0;i <= 1.0; i += 0.1)
        std::cout << range[i] << ' ';

    std::cout << std::endl;

    range[0] = 100;
    range[1] = 50;
    std::cout << "start = " << range[0] << ", finish = " << range[1] << std::endl;
    for(double i = 0.0; i <= 1.0; i += 0.1)
        std::cout << range[i] << ' ';

    std::cout << std::endl;
}