sample class definition for c++ ...

test-class.cpp

//
// test-class.cpp - sample class definition for c++ ...
//
//    $ g++ test-class.cpp -o test-class && ./test-class
//    c={a:1, b:2]
//    d={a:4, b:7]
//
#include <iostream>
#include <sstream>

class Test {
public:
    Test() : a_(0), b_(0) {
    }

    Test(const Test &val) {
        this->a_ = val.a_;
        this->b_ = val.b_;
    }

    Test(const int &a, const int &b) {
        this->a_ = a;
        this->b_ = b;
    }

    virtual ~Test() {
    }

    Test operator+(const Test &t) {
        return Test(a_ + t.a_, b_ + t.b_);
    }

    std::string str() const {
        std::stringstream ss;
        ss << "{a:" << a_ << ", b:" << b_ << "]";
        return ss.str();
    }

    int  a() const         { return a_; }
    void a(const int &val) { a_ = val; }
    int  b() const         { return b_; }
    void b(const int &val) { b_ = val; }

private:
    int a_;
    int b_;
};

std::ostream& operator<<(std::ostream& os, const Test &val)
{
    os << val.str();
    return os;
}

int main(int argc, char *argv[])
{
    Test a(1, 2);
    Test b(3, 5);
    Test c, d;

    c = a;
    d = a + b;

    std::cout << "c=" << c << std::endl;
    std::cout << "d=" << d << std::endl;

    return 0;
}