How to initialize each object when allocating an object array

Question

In C++, I have a class CMyObject as follows, where CData is another class name:

Class CMyObject
{
CMyObject(CData& Data): m_Data(Data) {};
virtual ~CMyObject(void);

private:
  const CData& m_Data;
}

When allocate one CMyObject instance, I can do as follows:

P = new CMyObject(MyData);

However, if I want to create an array of CMyObject, then can I do as follows?

P = new CMyObject(MyData)[10];

Do you need to initialize each object of the array with something different? — Nicu Stiurca, Feb 20 '14 at 16:23

score 1 · Answer 1 · answered Feb 20 '14 at 16:19

1

You can use an initialization list (I used 4 to save some typing, but you get the idea):

CMyObject* P = new CMyObject[4]{MyData, MyData, MyData, MyData};

But better still, use an std::vector:

std::vector<CMyObject> P(10, MyData);

answered Feb 20 '14 at 16:19

juanchopanza

will std::vector P(10, MyData) consuming more memory than new CMyObject[10]? – alancc Feb 20 '14 at 23:13
@user2704265 A very small amount. About the size of two pointers. – juanchopanza Feb 21 '14 at 06:59

1 Answers1