<p>您可能希望在应用程序的单例类中处理非成员函数。工厂可以从程序或其他对象执行。在</p>
<P> C++支持全局函数(非成员函数),但是,对于应用程序使用单个对象,“做这个把戏”。在</p>
<p>另外,由于“教室”对象可以用许多可选参数实例化,所以您可能希望在调用构造函数(python中的init</strong>)之后分配它。在</p>
<pre><code>// filename: "classrooms.cpp"
class ClassroomClass
{
protected:
int _Room_Size;
int _N_Desks;
int _N_Boards;
int _N_Books;
bool _Has_Globe;
public:
// constructor without parameters,
// but, can be declared with them
ClassroomClass()
{
_Room_Size = 0;
_N_Desks = 0;
_N_Boards = 0;
_N_Books = 0;
_Has_Globe = false;
} // ClassroomClass()
public int get_Room_Size()
{
return _Room_Size;
}
public void set_Room_Size(int Value)
{
_Room_Size = Value;
}
// other "getters" & "setters" functions
// ...
} // class ClassroomClass
class ClassroomFactoryClass
{
public:
void addRequirement(char[] AKey, char[] AValue);
} // class ClassroomFactoryClass
class MyProgramClass
{
public:
ClassroomFactoryClass Factory;
public:
void makeTeacherRoom();
void doSomething();
} // class MyProgramClass
void MyProgramClass::addRequirement(char[] AKey, char[] AValue)
{
...
} // void MyProgramClass::addRequirement(...)
void MyProgramClass::makeTeacherRoom()
{
Factory.addRequirement("n_desks", "10")
Factory.addRequirement("n_boards", "1")
} // void MyProgramClass::makeTeacherRoom(...)
void MyProgramClass::doSomething()
{
...
} // void MyProgramClass::doSomething(...)
int main(char[][] args)
{
MyProgramClass MyProgram = new MyProgramClass();
MyProgram->doSomething();
delete MyProgram();
return 0;
} // main(...)
</code></pre>
<p>干杯</p>