CODEWITHSUNDEEP
c++classvectormember
user2421725
user2421725

Reputation: 77

C++ fixed number of vector size as class member

I have a class

class clsNode
{
private:
   vector<clsNode*>m_Daughters;

However, this vector will always contain only 2 clsNode pointer. It should not be dynamic vector, but rather a fixed length array that can hold 2 pointers to 2 clsNodes.

I tried

vector<clsNode*>m_Daughters[2];

But that threw a lot of compiler errors.

Can somebody tell me how to do that correctly?

Upvotes: 2

Views: 3782

Answers (2)

Rontogiannis Aristofanis
Rontogiannis Aristofanis

Reputation: 9063

vector<clsNode*>m_Daughters[2]; creates an array holding two elements of type vector<clsNode*>. To correct this, you can:

  • declare the vector vector<clsNode*> m_Daughters; and change the constructor of your class to clsNode() : m_Daughters(2, 0) {} // create a vector holding two objects of type clsNode*

  • no need to have a vector at all, just write clsNode* m_Daughters[2]; and change the constructor to clsNode() { m_Daughters[0] = m_Daughters[1] = 0; }

Upvotes: 2

masoud
masoud

Reputation: 56479

This definition has problem

vector<clsNode*> m_Daughters[2];

It makes m_Daughters as an array of two vector<clsNode*> which is far from your purpose.

 

To set the size, you can use its constructor

class clsNode
{
   vector<clsNode*> m_Daughters;
public:
   clsNode() : m_Daughters(2)
   {}
};

If the size is constant, you can use std::array:

class clsNode
{
   array<clsNode*, 2> m_Daughters;
};

Upvotes: 3

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