unordered_set.hpp

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#ifndef NEFORCE_CORE_CONTAINER_UNORDERED_SET_HPP__
#define NEFORCE_CORE_CONTAINER_UNORDERED_SET_HPP__

 
#include "NeForce/core/container/hashtable.hpp"
NEFORCE_BEGIN_NAMESPACE__


template <typename Value, typename HashFcn = hash<Value>, typename EqualKey = equal_to<Value>,
          typename Alloc = allocator<hashtable_node<Value>>>
class unordered_set : icollector<unordered_set<Value, HashFcn, EqualKey, Alloc>> {
    static_assert(is_hash_v<HashFcn, Value>, "unordered set requires valid hash function.");
    static_assert(is_allocator_v<Alloc>, "Alloc type is not a standard allocator type.");
    static_assert(is_same_v<hashtable_node<Value>, typename Alloc::value_type>, "allocator type mismatch.");
    static_assert(is_object_v<Value>, "unordered set only contains object types.");
 
private:
    using base_type = hashtable<Value, Value, HashFcn, identity<Value>, EqualKey, Alloc>; 
 
public:
    using key_type = typename base_type::key_type;     
    using value_type = typename base_type::value_type; 
    using hasher = typename base_type::hasher;         
    using key_equal = typename base_type::key_equal;   
 
    using size_type = typename base_type::size_type;             
    using difference_type = typename base_type::difference_type; 
    using pointer = typename base_type::const_pointer;           
    using const_pointer = typename base_type::const_pointer;     
    using reference = typename base_type::const_reference;       
    using const_reference = typename base_type::const_reference; 
    using iterator = typename base_type::iterator;               
    using const_iterator = typename base_type::const_iterator;   
    using allocator_type = typename base_type::allocator_type;   
 
private:
    base_type ht_{100}; 
 
public:
    unordered_set() :
    ht_(100, hasher(), key_equal()) {}

    explicit unordered_set(size_type n) :
    ht_(n) {}

    unordered_set(size_type n, const hasher& hf) :
    ht_(n, hf, key_equal()) {}

    unordered_set(size_type n, const hasher& hf, const key_equal& eql) :
    ht_(n, hf, eql) {}

    unordered_set(const unordered_set& other) :
    ht_(other.ht_) {}

    unordered_set& operator=(const unordered_set& other) {
        ht_ = other.ht_;
        return *this;
    }

    unordered_set(unordered_set&& other) noexcept(is_nothrow_move_constructible_v<base_type>) :
    ht_(_NEFORCE move(other.ht_)) {}

    unordered_set& operator=(unordered_set&& other) noexcept(is_nothrow_move_assignable_v<base_type>) {
        ht_ = _NEFORCE move(other.ht_);
        return *this;
    }

    template <typename Iterator>
    unordered_set(Iterator first, Iterator last) :
    ht_(100, hasher(), key_equal()) {
        ht_.insert_unique(first, last);
    }

    template <typename Iterator>
    unordered_set(Iterator first, Iterator list, size_type n) :
    ht_(n, hasher(), key_equal()) {
        ht_.insert_unique(first, list);
    }

    template <typename Iterator>
    unordered_set(Iterator first, Iterator last, size_type n, const hasher& hf) :
    ht_(n, hf, key_equal()) {
        ht_.insert_unique(first, last);
    }

    template <typename Iterator>
    unordered_set(Iterator first, Iterator last, size_type n, const hasher& hf, const key_equal& eql) :
    ht_(n, hf, eql) {
        ht_.insert_unique(first, last);
    }

    unordered_set(std::initializer_list<value_type> ilist) :
    unordered_set(ilist.begin(), ilist.end()) {}

    unordered_set(std::initializer_list<value_type> ilist, size_type n) :
    unordered_set(ilist.begin(), ilist.end(), n) {}

    unordered_set(std::initializer_list<value_type> ilist, size_type n, const hasher& hf) :
    unordered_set(ilist.begin(), ilist.end(), n, hf) {}

    unordered_set(std::initializer_list<value_type> ilist, size_type n, const hasher& hf, const key_equal& eql) :
    unordered_set(ilist.begin(), ilist.end(), n, hf, eql) {}

    NEFORCE_NODISCARD iterator begin() noexcept { return ht_.begin(); }

    NEFORCE_NODISCARD iterator end() noexcept { return ht_.end(); }

    NEFORCE_NODISCARD const_iterator begin() const noexcept { return ht_.begin(); }

    NEFORCE_NODISCARD const_iterator end() const noexcept { return ht_.end(); }

    NEFORCE_NODISCARD const_iterator cbegin() const noexcept { return ht_.cbegin(); }

    NEFORCE_NODISCARD const_iterator cend() const noexcept { return ht_.cend(); }

    NEFORCE_NODISCARD size_type size() const noexcept { return ht_.size(); }

    NEFORCE_NODISCARD size_type max_size() const noexcept { return ht_.max_size(); }

    NEFORCE_NODISCARD bool empty() const noexcept { return ht_.empty(); }

    NEFORCE_NODISCARD size_type count(const key_type& key) const noexcept(noexcept(ht_.count(key))) {
        return ht_.count(key);
    }

    NEFORCE_NODISCARD size_type buckets_size() const noexcept { return ht_.buckets_size(); }

    NEFORCE_NODISCARD size_type max_bucket_count() const noexcept { return ht_.buckets_max_size(); }

    NEFORCE_NODISCARD size_type bucket_size(size_type n) const noexcept { return ht_.bucket_size(n); }

    NEFORCE_NODISCARD hasher hash_function() const noexcept(noexcept(ht_.hash_function())) {
        return ht_.hash_function();
    }

    NEFORCE_NODISCARD key_equal key_eq() const noexcept(noexcept(ht_.key_eql())) { return ht_.key_eql(); }

    NEFORCE_NODISCARD float load_factor() const noexcept { return ht_.load_factor(); }

    NEFORCE_NODISCARD float max_load_factor() const noexcept { return ht_.max_load_factor(); }

    void max_load_factor(float lf) noexcept { ht_.max_load_factor(lf); }

    void rehash(size_type n) { ht_.rehash(n); }

    void reserve(size_type n) { ht_.reserve(n); }

    template <typename... Args>
    pair<iterator, bool> emplace(Args&&... args) {
        return ht_.emplace_unique(_NEFORCE forward<Args>(args)...);
    }

    pair<iterator, bool> insert(const value_type& value) { return ht_.insert_unique(value); }

    pair<iterator, bool> insert(value_type&& value) { return ht_.insert_unique(_NEFORCE forward<value_type>(value)); }

    template <typename Iterator>
    void insert(Iterator first, Iterator last) {
        ht_.insert_unique(first, last);
    }

    size_type erase(const key_type& key) noexcept { return ht_.erase(key); }

    void erase(iterator position) noexcept { ht_.erase(position); }

    void erase(iterator first, iterator last) noexcept { ht_.erase(first, last); }

    void clear() noexcept { ht_.clear(); }

    NEFORCE_NODISCARD iterator find(const key_type& key) { return ht_.find(key); }

    NEFORCE_NODISCARD const_iterator find(const key_type& key) const { return ht_.find(key); }

    NEFORCE_NODISCARD pair<iterator, iterator> equal_range(const key_type& key) { return ht_.equal_range(key); }

    NEFORCE_NODISCARD pair<const_iterator, const_iterator> equal_range(const key_type& key) const {
        return ht_.equal_range(key);
    }

    void swap(unordered_set& other) noexcept(is_nothrow_swappable_v<base_type>) { ht_.swap(other.ht_); }

    NEFORCE_NODISCARD bool equal_to(const unordered_set& rhs) const noexcept(noexcept(ht_ == rhs.ht_)) {
        return ht_ == rhs.ht_;
    }

    NEFORCE_NODISCARD bool less_than(const unordered_set& rhs) const noexcept(noexcept(ht_ < rhs.ht_)) {
        return ht_ < rhs.ht_;
    }
};
 
#ifdef NEFORCE_STANDARD_17
template <typename Iterator, typename HashFcn = hash<iter_value_t<Iterator>>,
          typename Compare = equal_to<iter_value_t<Iterator>>, typename Alloc = allocator<iter_value_t<Iterator>>>
unordered_set(Iterator, Iterator, HashFcn = HashFcn(), Compare = Compare(), Alloc = Alloc())
        -> unordered_set<iter_value_t<Iterator>, HashFcn, Compare, Alloc>;
 
template <typename Key, typename HashFcn = hash<Key>, typename Compare = equal_to<Key>, typename Alloc = allocator<Key>>
unordered_set(std::initializer_list<Key>, HashFcn = HashFcn(), Compare = Compare(), Alloc = Alloc())
        -> unordered_set<Key, HashFcn, Compare, Alloc>;
 
template <typename Iterator, typename Alloc>
unordered_set(Iterator, Iterator, Alloc)
        -> unordered_set<iter_value_t<Iterator>, hash<iter_value_t<Iterator>>, equal_to<iter_value_t<Iterator>>, Alloc>;
 
template <typename Iterator, typename HashFcn, typename Alloc>
unordered_set(Iterator, Iterator, HashFcn, Alloc)
        -> unordered_set<iter_value_t<Iterator>, HashFcn, equal_to<iter_value_t<Iterator>>, Alloc>;
 
template <typename Key, typename Alloc>
unordered_set(std::initializer_list<Key>, Alloc) -> unordered_set<Key, hash<Key>, equal_to<Key>, Alloc>;
 
template <typename Key, typename HashFcn, typename Alloc>
unordered_set(std::initializer_list<Key>, HashFcn, Alloc) -> unordered_set<Key, HashFcn, equal_to<Key>, Alloc>;
#endif
 // Container
 
NEFORCE_END_NAMESPACE__
#endif // NEFORCE_CORE_CONTAINER_UNORDERED_SET_HPP__