In file included from /in/driver/main.cpp:5:0:
/in/hashtable.hpp: In instantiation of 'bool HashTable<Key, Value, Hash, KeyEqual>::insert(const HashTable<Key, Value, Hash, KeyEqual>::Iterator&, const Key&, const Value&) [with Key = int; Value = int; Hash = std::hash<int>; KeyEqual = std::equal_to<int>]':
/in/hashtable.hpp:318:22:   required from 'bool HashTable<Key, Value, Hash, KeyEqual>::insert(const Key&, const Value&) [with Key = int; Value = int; Hash = std::hash<int>; KeyEqual = std::equal_to<int>]'
/in/driver/main.cpp:111:43:   required from here
/in/hashtable.hpp:300:48: error: conversion to 'double' from 'std::vector<std::forward_list<std::pair<const int, int>, std::allocator<std::pair<const int, int> > >, std::allocator<std::forward_list<std::pair<const int, int>, std::allocator<std::pair<const int, int> > > > >::size_type {aka long unsigned int}' may alter its value [-Werror=conversion]
             if (static_cast<double>(tableSize) / buckets.size() > maxLoadFactor) rehash(tableSize);
In file included from /in/driver/main.cpp:5:0:
/in/hashtable.hpp: In instantiation of 'size_t HashTable<Key, Value, Hash, KeyEqual>::findMinimumBucketSize(size_t) const [with Key = int; Value = int; Hash = std::hash<int>; KeyEqual = std::equal_to<int>; size_t = long unsigned int]':
/in/hashtable.hpp:390:43:   required from 'void HashTable<Key, Value, Hash, KeyEqual>::rehash(size_t) [with Key = int; Value = int; Hash = std::hash<int>; KeyEqual = std::equal_to<int>; size_t = long unsigned int]'
/in/hashtable.hpp:300:88:   required from 'bool HashTable<Key, Value, Hash, KeyEqual>::insert(const HashTable<Key, Value, Hash, KeyEqual>::Iterator&, const Key&, const Value&) [with Key = int; Value = int; Hash = std::hash<int>; KeyEqual = std::equal_to<int>]'
/in/hashtable.hpp:318:22:   required from 'bool HashTable<Key, Value, Hash, KeyEqual>::insert(const Key&, const Value&) [with Key = int; Value = int; Hash = std::hash<int>; KeyEqual = std::equal_to<int>]'
/in/driver/main.cpp:111:43:   required from here
/in/hashtable.hpp:173:62: error: conversion to 'double' from 'long unsigned int' may alter its value [-Werror=conversion]
         size_t minSize = static_cast<unsigned int>(std::ceil(tableSize / maxLoadFactor));
                                                              ^~~~~~~~~
cc1plus: all warnings being treated as errors