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[英]Create a vector of base class objects and store derived class objects within
[英]Store abstract derived class objects in base class vector
我已经学会了通过存储基类指针将派生类指针存储在基类向量中:
vector<base*> base_vector;
base_vector.push_back(new derived());
// free memory at the end
但是如果我有一个抽象基类:
class interface {
public:
virtual interface(){}
virtual ~interface(){}
};
从中派生出另外两个抽象类。
class abstract_derived_1 : virtual public interface
{
public:
virtual abstract_derived_1(){}
virtual ~abstract_derived_1(){}
};
class abstract_derived_2 : virtual public interface
{
public:
virtual abstract_derived_2(){}
virtual ~abstract_derived_2(){}
};
以及来自次要抽象类的其他几个派生类:
class derived_1 : virtual public interface, virtual public abstract_derived_1
{
private:
double value;
public:
derived_1(){value=0;}
derived_1(const double val1, const double val2) { value = val1+val2; }
~derived_1(){}
};
class derived_2 : virtual public interface, virtual public abstract_derived_2
{
private:
string name;
public:
derived_2(){name="";}
derived_2(string my_str) { name = my_str; }
};
是否可以将它们全部存储在多态向量中? 和往常一样,我做了以下工作:
vector<abstract_derived_1*> abs1;
vector<abstract_derived_2*> abs2;
abs1.push_back(new derived_1(1,2));
abs2.push_back(new derived_2("polymorphism"));
但是如何将两个多态向量存储在基类向量中?
vector</* What should I put in here? */> interface_vector;
只需将新derived_1
和derived_2
实例derived_2
回通用向量vector<interface*>
就没有问题,因为它们具有interface
类作为祖先。
顺便说一句:您无需从interface
再次继承derived_1
类和derived_2
类。 这是罕见的,我很确定这可能会导致其他问题。
vector<interface*> interface_vector;
// Loop through abs1 with an index of i
interface_vector.push_back(dynamic_cast<interface*>(abs1[i]));
// Loop through abs2 with an index of i
interface_vector.push_back(dynamic_cast<interface*>(abs2[i]));
只需在上面添加循环即可。 主要的一点是,你可以转换为interface*
这就是你的vector<interface*>
的期望。
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