c++——inline

• inline-- line of code is embedded, similar but more powerful macro (macro do not type checking)
• Space for time
• Not defination, but declaration
• Recommend two or three lines of the short-function, or can be called many times (function cycle) is defined as inline
• Large function (> 20 lines), a recursive function
• Function bodies, do not need .h file .cpp file
• Class member function write directly in the body of the function in the .h, no need to add inline keyword (.cpp do not need to complete the class definition)
• It recommended that the get () and set () is defined as within the Union