Prefixing :: to C++ functions or namespaces

• Putting :: before a function, as in ::find(), means it is the global function, not one in the current scope
  

  Take ::find() here. It is a function from the STL algorithm library. Even without ::, the compiler would look in the global scope if it couldn’t find find locally, but adding it makes the code clearer

• jj01::test_array() = this is a namespace