john9francis

#include <iostream>
#include <string>
#include <map>
#include <vector>

int main()
{
    // a map is a really good way to keep track of information.
    // if the key doesn't exist, it will be created.
    // if the key does exist, it will just reassign the value

john9francis

// explanation:
// Defines 3 classes: Parent, Child, and Thing.
// Thing takes in a parent into its constructor.
// Parent initializes a Thing in its constructor using 'this.'
// Child does nothing but initialize Parent().
//
// main initializes a Child class, and calls a function from Thing.
// Thing, which was initialized using 'this' in the parent constructor,
// uses that 'this' to refer to the Child, not the Parent.

john9francis

// showing how copying an instance of a class
// doesn't copy the dynamically allocated variables,
// it simply copies over their address. So the new
// copy shares the old variable.

#include <iostream>

class Thing{
public:
    Thing(){ pInt = new int; }

john9francis

// testing how many threads work in c++
// spoiler alert: at least 2000 work, probably more

#include <thread>
#include <iostream>
#include <chrono>
#include <vector>

void count(int threadNumber){
  // Function that counts 5 seconds