C++ class confusion
Author
Say I have a class, for example:
class CSprite
{
public:
CSprite();
~CSprite(){}
protected:
bool m_bInitialized;
int * m_sequences[8];
};
In the constructor I want to initialize this variable to be {0,0,0,0,0,0,0,0} something like this:
CSprite::CSprite():
m_bInitialized(false),
m_sequences({0,0,0,0,0,0,0,0})
{}
This does not work, so I am wondering if anyone knows the correct syntax to perform such an initialization in the constructor...
I want to avoid using the actual body of the constructor, by the way...
Thanks
"Sometimes I think the surest sign that intelligent exists elsewhere in the universe is that none of it has tried to contact us" -Calvin
Not sure if you can do that at all, but I''m more sure you can''t do it if the member is a pointer. If you already know the number of elements, try just making it a static array. Otherwise, unless this is a school assignment, why are you avoiding using the body of the constructor?
Peace,
ZE.
P.S. I''m probably wrong in some of my reasoning. Anyone, feel free to correct.
//email me.//zealouselixir software.//msdn.//n00biez.//
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Peace,
ZE.
P.S. I''m probably wrong in some of my reasoning. Anyone, feel free to correct.
//email me.//zealouselixir software.//msdn.//n00biez.//
miscellaneous links
[if you have a link proposal, email me.]
You can''t initialize an array in an initializer list. You''ll have to find some alternative.
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Array initializer list can be used only when you declare the array, but in your case, it is impossible to do so because it''s a data member of a class. You will have to use a repetition structure inside the ctor to accomplish your task.
just memset it to zero in your constrcutor. That is prolly the easiest way to initialize them all to 0.
--michael
--michael
Another person wondering why you''d like to keep it out of the constructor body... I can''t possibly think of any reason for this. Could you explain please?
You could do this...
m_sequences[0]=m_sequences[1]=m_sequences[2]=m_sequences[3]=m_sequences[4]=m_sequences[5]=m_sequences[6]=m_sequences[7]=0;
Or,
memset(m_sequences,0,sizeof(int*)*8);
Or,
for (int ctr=0;ctr!=8;++ctr)
m_sequences[ctr]=0;
Billy - BillyB@mrsnj.com
(Hey, I''''m no longer anonymous!)
m_sequences[0]=m_sequences[1]=m_sequences[2]=m_sequences[3]=m_sequences[4]=m_sequences[5]=m_sequences[6]=m_sequences[7]=0;
Or,
memset(m_sequences,0,sizeof(int*)*8);
Or,
for (int ctr=0;ctr!=8;++ctr)
m_sequences[ctr]=0;
CSprite::CSprite(){ m_bInitialized=0; memset(m_sequences,0,sizeof(int*)*8);} Billy - BillyB@mrsnj.com
(Hey, I''''m no longer anonymous!)
Trediction,
Here is the proper way (in my opinion) to do what you want:
The above code uses a vector to maintain your array of int-pointers and initialises the vector in the constructor. The vector is initialised with 8 elements and sets them to an initial value of 0.
Hopefully this helps you out.
Dire Wolf
www.digitalfiends.com
[edited by - Dire.Wolf on May 3, 2002 12:10:18 AM]
Here is the proper way (in my opinion) to do what you want:
#include <vector> class CSprite{ public: CSprite(); ~CSprite(){} protected: bool m_bInitialized; std::vector<int*> m_sequences;}; CSprite::CSprite() : m_bInitialized(false), m_sequences(8, 0){} The above code uses a vector to maintain your array of int-pointers and initialises the vector in the constructor. The vector is initialised with 8 elements and sets them to an initial value of 0.
Hopefully this helps you out.
Dire Wolf
www.digitalfiends.com
[edited by - Dire.Wolf on May 3, 2002 12:10:18 AM]
I have a following question. Why not have it like...
int *m_sequences;
m_sequences = new int[8](0);
// dont need this...
// memset(m_sequences, 0, 8);
int *m_sequences;
m_sequences = new int[8](0);
// dont need this...
// memset(m_sequences, 0, 8);
quote:Original post by Anonymous Poster
I have a following question. Why not have it like...
I usually find the fact that it''s illegal syntax is sufficient to put most people off.
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