Monte Carlol模拟的C ++类设计

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问题描述

我试图建立一个蒙特卡罗对象类，我想知道设计相关类的最好方法。

I'm trying to build a Monte Carlo object class and am wondering about the best way to design the relevant classes.

对象的结构）包含名称，描述 AND分布类型，其可以是几种不同类型，例如。正常，固定整数，三角形等。
Distribution类是（或可能是）特定分布的超类。正常。

The structure of the object (called Entity) contains name, description AND a Distribution type which can be of a few different types eg. Normal, Fixed Integer, Triangle etc.The Distribution class is (or might be) a superclass of the specific distributions eg. Normal.

所以，我有

class Entity {
public:
  string name;
  Distribution* dsn; // superclass. Can this be done?
}

class Distribution {
   public:
   string Type;
   double Sample(void)=0; // To be implemented in subclasses, same function sig.
}

然后，实际分配的示例可能是

Then an example of the actual distribution might be

class NormalDistribution : public Distribution {
    public:
    setMean(double mean);
    setStdDeb(double stddev);
    double Sample(void);
}

FixedDistribtion也将是Distribution的子类并实现不同的方法。 setWeights，setValues以及Sample of Sample。

FixedDistribtion would also be a subclass of Distribution and implement different methods eg. setWeights, setValues as well as Sample of course.

我希望这样编写代码

Entity* salesVolume = new Entity();
salesVolume->setDistribution(NORM);
salesVolume->dsn->setMean(3000.0:
salesVolume->dsn->setStdDev(500.0);

Entity* unitCost = new Entity();
unitCost->dsn->setWeights( .. vector of weights);
unitCost->dsn->setValues( .. vector of values) ;

然后

loop
   sv = salesVolume->sample();
   uc = unitCost->sample();
endloop

我想要做的是在Entity中定义一个Distribution（超类），然后使用它的子类方法，该方法根据分布类型而变化，例如setMean。Entity中的分布对象将被确定运行时例如
if（distnType == NORM）dsn = new NormalDistribution;
if（distnType == FIXED）dsn = new FixedDistribution;

What I'd like to do is define a Distribution (superclass) in Entity, then use its subclass methods which vary depending on distribution type eg. setMean. The distribution object in Entity would be determined at run-time eg.if (distnType == NORM) dsn = new NormalDistribution;if (distnType == FIXED) dsn = new FixedDistribution;

在C ++中是可能的，还是完全失去了多态性的概念？我无法将dsn变量定义为超类，然后在运行时缩小到实际的分布。一个（更简单的）方式是定义实体而不使用分布，并使用自己的分布，而不附加到实体。

Is this possible in C++, or have completely lost the concept of Polymorphism? I'm having trouble defining the dsn variable as the superclass, then narrowing down to an actual distribution at run-time. A (simpler) way would be to define Entity without a Distribution, and use Distribution's on their own, without attachment to Entity.

感谢伙伴

Distribution

Monte Carlol模拟的C ++类设计

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