Unexpected Duplicate Key Insertion in Custom HashMap Implementation in C++
I'm working with an scenario with my custom HashMap implementation in C++. Despite implementing a hash function and a comparison operator for key uniqueness, I'm able to insert duplicate keys without any errors. Here’s a simplified version of my code: ```cpp #include <iostream> #include <vector> #include <list> #include <utility> template <typename K, typename V> class HashMap { private: std::vector<std::list<std::pair<K, V>>> table; size_t currentSize; size_t capacity; size_t hashFunction(const K& key) { return std::hash<K>()(key) % capacity; } public: HashMap(size_t cap) : capacity(cap), currentSize(0) { table.resize(capacity); } void insert(const K& key, const V& value) { size_t index = hashFunction(key); for (const auto& pair : table[index]) { if (pair.first == key) { std::cout << "Key already exists. Not inserting!\n"; return; } } table[index].emplace_back(key, value); currentSize++; } }; int main() { HashMap<std::string, int> myMap(10); myMap.insert("key1", 100); myMap.insert("key1", 200); // This should not insert a duplicate return 0; } ``` I expected the second insertion of the key "key1" to be ignored, but it seems to get added anyway. I’ve confirmed that the hash function is working correctly and that the comparison operator is being called, yet the duplicate is still inserted. I’ve tried debugging by placing print statements within the `insert` method to track the flow of execution, but everything seems to be in order. Could this scenario be related to how I’m using the list to store key-value pairs? Is there something I'm missing in terms of memory management or iterator invalidation in this context? Any insights would be greatly appreciated!