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King Popsicle
King Popsicle

Reputation: 465

class defined variable can't be found by class function

"block.h"

enum BlockType
{
    BlockType_Default = 0,
    BlockType_Grass,
};

class Block
{
public:
    Block();
    ~Block();

    bool IsActive();
    void SetActive(bool activeParameter);
private:
    bool active;
    BlockType m_blockType;
};

"block.cpp"

#include "block.h"

Block::Block()
{
    m_blockType = BlockType_Grass;
    active = true;
}

Block::~Block()
{

}

bool Block::IsActive()
{

     return active;
}

void Block::SetActive(bool activeParameter)
{
    active = activeParameter;
}

Here is my class. Now my problem is when I run the program and call the IsActive(); function, I get an error EXC_BAD_ACCESS (code=1, address = 0x0) on the line that checks if active is true. From what I read is what is returned if the variable doesn't exists. What is wrong with my code?

Here is where I call the function main.cpp

Block* m_pBlocks[32][32][32];

void main()
{
    for(int x = 0; x < 32; x++)
    {
        for(int y = 0; y < 32; y++)
        {
            for(int z = 0; z < 32; z++)
            {
                printf("x:%d y:%d z:%d",x,y,z);
                if(m_pBlocks[x][y][z]->IsActive())
                {
                    //DisplayBlock
                }
            }
        }
    }


}

Upvotes: 1

Views: 101

Answers (1)

Alexis Wilke
Alexis Wilke

Reputation: 20731

This statement

Block* m_pBlocks[32][32][32];

defines 32 x 32 x 32 NULL pointers. So when you try -> on those NULL pointers, it fails.

You either need to create blocks, or allocate them:

Block m_pBlocks[32][32][32];

Block* m_pBlocks[32][32][32];
m_pBlocks[x][y][z] = new Block;

Upvotes: 1

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