C++ templates

C++ templates are set at compile time not runtime like C#, java

//returns max of two values
template <class T>
T max(T& t1, T& t2){
    return t1 < t2 ? t2 : t1;
}

overload operators in c++ often
instead creating a Add() overload + and or +=

in a class f you don't specify the default is private in a struct the default is public

C++ style guide
https://google.github.io/styleguide/cppguide.html

enum e_acomany { 
	Audi,
	BMW, 
	Cadillac, 
	Ford,
	Jaguar, 
	Lexus 
	Maybach, 
	RollsRoyce, 
	Saab
};
e_acompany my_car_brand;
my_car_brand = RollsRoyce; // notice you don't do e_acomany. so decorate the enum name around the member 
 
if (my_car_brand == Ford) 
	cout << "Hello, Ford-car owner!" << endl;
  
  
 
 

//bitwise
cout << (5 & 3) << '\n'; //1
cout << (1 & 0) << '\n';//0
cout << (0 ^ 1) << '\n';//1
//shift bits
int i =4;

cout << (i >> 1) << '\n'; //2 moves 1 bit to the right
cout << (i << 1) << '\n'; //8 moves 1 bit to the left

friend gives member function access to share a private member

A pointer is a variable that holds the address to another variable. int* a = &p; // *a is = to memory location of p; *a = 5; The reference is now updated.

const promises that it will not change members, that means const fn can only call other const fns

declare a pointer to be a const int* const ptr or to point to a const // const int* ptr =&a;

cons of manual memory management
-delete twice - error
-never delete - memory leak

• delete to soon - app blows up when someone tries to use it