Design Pattern The 3-builder generator _ design pattern and architecture of reading notes

BUILDER (builder)--Object creation mode

1. Intention: Separate the construction of a complex object from its representation, so that the same build process can create different representations.

2. Applicability: Applicable to the use of builder mode,

A. When creating complex objects should be independent of the components of the object and their assembly methods.

B. When the construction process must allow the constructed object to have a different representation

3. code example:

The Mazebuilder class defines the following interface
class mazebuilder{public
       :
            virtual void Buildmaze () {}
            virtual void Buildroom ( ) {}
            Virtual maze* getmaze ();
       Protected:
             Mazebuilder ();

Use builder
maze* Mazegame::createmaze (mazebuilder* builder)
{
     Builder. Buildmaze ();
     Builder. Buildroom ();
     Return builder. Getmaze ();
}