C++ Pointer to unordered_map entry changes, but entry not

Question

I'm trying to set a variable of unordered_map entry "chunk" by calling a function using a pointer to this entry. The pointer changes its value "chunkIndex", but the map entry not

glm::ivec3 chunkIndex(1, 1, 1);
chunks.insert(make_pair(chunkIndex, Chunk()));
chunk = &chunks[chunkIndex];
chunk->setChunkIndex(chunkIndex);

logVector(chunk->chunkIndex);                      // output: 1, 1, 1
logVector(chunks[chunk->chunkIndex].chunkIndex);   // output: 0, 0, 0

"chunks" is an unordered_map of type:

typedef unordered_map<glm::ivec3, Chunk, KeyHash, KeyEqual> ChunkMap;

Do you know why only the pointer changes its value, and not the referenced object?

Thanks in advance!

Update:

chunks.insert(make_pair(chunkIndex, Chunk()));
log((chunks.find(chunkIndex) == chunks.end()) ? "true" : "false");

This code outputs true, so it the inserted entry actually doesn't exist!

This might be useful too:

struct KeyHash
{
    size_t operator()(const glm::ivec3& k)const
    {
        return std::hash<int>()(k.x) ^ std::hash<int>()(k.y) ^ std::hash<int>()(k.z);
    }
};
struct KeyEqual
{
    bool operator()(const glm::ivec3& a, const glm::ivec3& b)const
    {
        return a.x < b.x || (a.x == b.x && a.y < b.y) || (a.x == b.x && a.y == b.y && a.z < b.z);
    }
};

typedef unordered_map<glm::ivec3, Chunk, KeyHash, KeyEqual> ChunkMap;

Iterating through the keys also outputs 1, 1, 1

for (auto it : chunks) {
    logVector(it.first);
}

Answer 1

Your KeyEqual doesn't implement equality. Replace it with:

return a.x == b.x && a.y == b.y && a.z == b.z;