C++ Namespaces

1. What is Namespace

   Namespaces are a way of preventing name conflicts in projects

2. How to write namespace

   To create namespace you use namespace keyword and in {} you can define functions/variables/etc

   namespace test {
       void print(const char* message){
           std::cout << message << std::endl;
       }
   }

   You access namespace by using name and :: and then name of function/variables/etc

   namespace test {
       void print(const char* message){
           std::cout << message << std::endl;
       }
   }
    
   test::print("hello world");

   If you don't want to write namespace name and :: you can use directive using namespace and then namespace name. It will allow you to use defined functions/variables/etc without writing that :: stuff.

   namespace test {
       void print(const char* message){
           std::cout << message << std::endl;
       }
   }
    
   using namespace test;
   print("hello world")

   or you can specify what namespace and function/variable/etc you are using using using and then function/variable/etc name after.

   namespace test{
       void print(const char* message){
           std::cout << message << std::endl;
       }
       void log(const char* message){
           std::cout << "LOG: " << message << std::endl;
       }
   }
    
   using test::print; 
   print("lalala") // you can use this without test::
   log("lalala") // you cant use this without test::