CODEWITHSUNDEEP
c++memory-managementnew-operator
Jeroen
Jeroen

Reputation: 16865

Can I implement this somehow without using the new keyword? C++

Is there a way I can implement this without using the new keyword? 

void World::generateChunk(Coordinate coord) {
    if(loadedChunks[coord])
        delete loadedChunks[coord];
    loadedChunks[coord] = new Chunk(coord);
    loadedChunks[coord]->generate();
}

loadedChunks is a std::map<Coordinate, Chunk*>.

Upvotes: 1

Views: 104

Answers (1)

Nikos C.
Nikos C.

Reputation: 51920

Yes, by using a:

std::map<Coordinate, Chunk>

World::generateChunk() would them become:

void World::generateChunk(Coordinate coord)
{
    loadedChunks[coord] = Chunk(coord);
    loadedChunks[coord].generate();
}

Be aware of the implications of this. There's no destructor call anymore since the existing object is being assigned to. And polymorphism doesn't work anymore (you won't be able to store Chunk subclasses in loadedChunks.) Furthermore, at least loadedChunks.size() objects will always exist; they are not deletable.

Chunk must also meet the criteria of the standard container classes, like being copy-constructible, assignable, etc. And make sure that those operations work correctly (for example you need to determine whether you need a deep copy or shallow copy.)

Upvotes: 3

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