hjk41的日志

1. Make the constructors private to control the constructing of objects.
2. Declare public peudo-constructors whichby clients get the objects.
3. Better declare the object static in function, not in class.
. static objects in functions are initialized the first time the function is called while those in classes are always initialized
. the order of initialization of static objects in different classes are not defined
. however, functions containing static objects cannot be declared inline

namespace PrintingStuff {
  class Printer {                            
  public:                                    
    void submitJob(const PrintJob& job);
    void reset();
    void performSelfTest();
    ...

    friend Printer& thePrinter();

  private:
    Printer();   //[i] private ctors[/i]
    Printer(const Printer& rhs);  // don't define this function so as
                                           // to prevent copying
    ...
 };

 Printer& thePrinter()             // [i]peudo-constructor[/i]
 {
    static Printer p;                 // [i]static var in function[/i]
    return p;
 }
}