Pointers and "explode" function

1. I'm making a level editor for my game, so I have a .txt like this
Layer 1
Line 1 0,0,47,43,1,0,0,0,38,... (64 tiles)
Line 2... (64 lines)
Layer 2
... (64x64)
Layer 3
... (64x64)

On PHP I could use commands like explode(), is there a similar command for C++? I need so I can get the separate values for each comma, thanks again!

2. Returning an array, am I doing something wrong?

Code:

---

//inside class CLevel;
int *getCamera()
    {
        int camera[2];
        camera[0] = 40;
        camera[1] = 40;

        return camera;
    }

//on int main
CLevel *levelCommands;
levelCommands = new CLevel;
int *camera;
camera = levelCommands->getCamera();

---

camera[0] returns me like a huge int and camera[1] returns me -1... doesn't make any sense. :P

Thanks guys!

Quote:

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Originally Posted by Clash

On PHP I could use commands like explode(), is there a similar command for C++? I need so I can get the separate values for each comma, thanks again!

---

No, there's not such a thing in standard c++.

Quote:

---

Originally Posted by Clash

2. Returning an array, am I doing something wrong?
[code]
//inside class CLevel;
int *getCamera()
{
int camera[2];
camera[0] = 40;
camera[1] = 40;

return camera;
}

camera[0] returns me like a huge int and camera[1] returns me -1... doesn't make any sense. :P

---

Technically, you are returning a pointer, not an array. And in this case, you're returning a pointer to a local variable, which leads to this undefined behaviour.

You could use the strtok() function to split up your line into tokens.

Regards
Alan

Quote:

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Originally Posted by aquartz

Technically, you are returning a pointer, not an array. And in this case, you're returning a pointer to a local variable, which leads to this undefined behaviour.

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And what would be the correct way to return an array?

Hi.

In C++, you can't really pass or return an array. A common practice is pass the address of the array (along its size) or to pass a reference to the array (in this case, its size must be defined in compile time). The following code ilustrates both cases:

Code:

---

void getCamera(int camera[], size_t size)
{
  //Your code goes here.
}

void getCamera(int (&camera)[2]) //Must specify the size here.
{
  //Your code goes here.
}

---

Quote:

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Originally Posted by ltcmelo

Hi.

In C++, you can't really pass or return an array. A common practice is pass the address of the array (along its size) or to pass a reference to the array (in this case, its size must be defined in compile time). The following code ilustrates both cases:

Code:

---

void getCamera(int camera[], size_t size)
{
  //Your code goes here.
}

void getCamera(int (&camera)[2]) //Must specify the size here.
{
  //Your code goes here.
}

---

---

Thanks for your reply,
Sorry for the dumb question, I just can't understand why should I declare I'm sending info to the getCamera fuction if what I want is to it give me info, not send info to it. Thanks!

Edit: Hmm, I think I got it, I send what I want to be returned, right?

Code:

---

int getCamera(int (&camera)[2])
    {
        camera[0] = cameraX;
        camera[1] = cameraY;

        return camera[2];
    }

---

Quote:

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Originally Posted by Clash

Hmm, I think I got it, I send what I want to be returned, right?

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Yes, you got it :) !

1. Well you can use strtok() or
write your own explode() function
http://www.codeguru.com/forum/showth...ight=tokenize#