C ++我在数组/动态内存方面遇到一些问题

Question

so I'm making a lame little snowboarding game (which is what all my questions have been about) and I'm having some issues. I have a Biome class, which has a dynamic array to store the possible obstacles for that biome (obstsInBiome). Here is the constructor:

Biome::Biome(Obstacle obsts[], int amountOfObsts)
{
    maxObstAmount = 10; // Max amount of obstacles to spawn in each biome
    obstAmount = amountOfObsts; // The amount of obstacles passed in in the obsts parameter

    // This part copys the array passed in to the obstsInBiome array (Class member to store obstacles)
    // I think this is where the error may be
    obstsInBiome = new Obstacle [amountOfObsts]; // Creating array to hold the possible obstacles in this biome
    for (int x = 0; x < amountOfObsts; x++) // Filling the obstacle array with the obstacles passed in
    {
        obstsInBiome[x] = obsts[x];
    }
}

Then to create a new biome, i use this:

Obstacle villageObsts[] = {tree, rock, cabin, log}; // tree, rock, and cabin are all Obstacles
Biome village(villageObsts, 4);

Somewhere within this code, the first element of obstsInBiome is not getting set properly. village.obstsInBiome[0] is what I mean.

When i try to draw that to the screen, it doesn't appear and invisible collisions happen with the player as if they hit the obstacle. The rest of the array (rock, cabin, and log) all work perfectly. village.obstsInBiome[1 through 3] all work fine.

Can someone point out the error in this code?

Answer 1

At first glance, in particular at where you say you think the error is, it could be in the implementation of the copy constructor for the tree. I don't know what exactly an "Obstacle" is, nor do I know what the specific characteristics of those 4 instances are. Perhaps the tree instance has some kind of data that doesn't copy cleanly, whereas the other 3 do.

If you aren't sure what I mean by the copy constructor, that is probably a good thing to learn about.

http://en.wikipedia.org/wiki/Copy_constructor