1.3.4 Other

• Member in Class Initialization.
  class Section{ 
  int m_a = 10; 
  }
• for Loop
  for(auto x :prices) 
      cout<< x <<endl; 
   
  for(aut &x : vector) 
     x = 111;
• New container: forward_list, unordered_map unordered_set. The latter two support implementing hash tables.
• Rvalue reference and move have been discussed before.
• If you provide a move constructor, then the default constructor, the copy ctor, and the assignment operator are not provided by compiler, In that case, you can sue the keyword default to explicitly declare the defaulted version of these methods. Then, compiler will produce them automatically again.
  class Foo{ 
  Foo(const Foo& ) = default
• delete keyword, on the other hand, can be sued to prevent the compiler from using a particular methods. Below prevent an boject from being copied. In the past, we place copy ctor in private, but use delete more easily understood.
  class Foo{ 
  Foo(const Foo& ) = delete
• override and final. Use final in Base class, to stop sub class override. Use override in sub class, make sure override functions has the same exact function signature.
  class Base{ 
  virtual void method1() final; 
  virtual void method2(int); 
  } 
   
  class Sub: public Base{ 
  virtual void method(int) override; 
  }
• Variadic Templates
  template<typename... Args> 
  void show_list<Args... args){ 
  ... 
  }