diff --git a/TinySTL/Detail/Unordered_set.impl.h b/TinySTL/Detail/Unordered_set.impl.h
index 60e7754..2bda7f0 100644
--- a/TinySTL/Detail/Unordered_set.impl.h
+++ b/TinySTL/Detail/Unordered_set.impl.h
@@ -1,7 +1,52 @@
 #ifndef _UNORDERED_SET_IMPL_H_
 #define _UNORDERED_SET_IMPL_H_
 
+#include <functional>
+
 namespace TinySTL{
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::size()const{ 
+		return size_; 
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	bool Unordered_set<Key, Hash, KeyEqual, Allocator>::empty()const{ 
+		return size() == 0; 
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::bucket_count()const{ 
+		return buckets_.size(); 
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::bucket_size(size_type i)const{ 
+		return buckets_[i].size(); 
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::bucket(const key_type& key)const{
+		return bucket_index(key);
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	float Unordered_set<Key, Hash, KeyEqual, Allocator>::load_factor()const{
+		return (float)size() / (float)bucket_count();
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::haser 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::hash_function()const{
+		return haser();
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::key_equal 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::key_eq()const{
+		return key_equal();
+	}
+	template<class Key, class Hash, class KeyEqual, class Allocator>
+	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::allocator_type 
+		Unordered_set<Key, Hash, KeyEqual, Allocator>::get_allocator()const{
+		return allocator_type();
+	}
 	template<class Key, class Hash, class KeyEqual, class Allocator>
 	size_t Unordered_set<Key, Hash, KeyEqual, Allocator>::prime_list_[PRIME_LIST_SIZE] = {
 		53, 97, 193, 389, 769, 1543, 3079, 6151, 12289, 24593, 49157, 98317, 196613, 393241,
@@ -11,7 +56,8 @@ namespace TinySTL{
 	template<class Key, class Hash, class KeyEqual, class Allocator>
 	bool Unordered_set<Key, Hash, KeyEqual, Allocator>::has_key(const key_type& key){
 		auto& list = buckets_[bucket_index(key)];
-		return TinySTL::find(list.begin(), list.end(), key) != list.end();
+		auto pred = std::bind(KeyEqual(), key, std::placeholders::_1);
+		return TinySTL::find_if(list.begin(), list.end(), pred) != list.end();
 	}
 	template<class Key, class Hash, class KeyEqual, class Allocator>
 	typename Unordered_set<Key, Hash, KeyEqual, Allocator>::size_type
@@ -42,7 +88,7 @@ namespace TinySTL{
 	Unordered_set<Key, Hash, KeyEqual, Allocator>::Unordered_set(InputIterator first, InputIterator last){
 		size_ = 0;
 		auto len = last - first;
-		buckets_.resize(len);
+		buckets_.resize(next_prime(len));
 		for (; first != last; ++first){
 			auto index = bucket_index(*first);
 			if (!has_key(*first)){
diff --git a/TinySTL/Unordered_set.h b/TinySTL/Unordered_set.h
index 9b89d17..78f43c3 100644
--- a/TinySTL/Unordered_set.h
+++ b/TinySTL/Unordered_set.h
@@ -18,6 +18,7 @@ namespace TinySTL{
 		typedef Key value_type;
 		typedef size_t size_type;
 		typedef Hash haser;
+		typedef KeyEqual key_equal;
 		typedef Allocator allocator_type;
 		typedef value_type& reference;
 		typedef const value_type& const_reference;
@@ -32,6 +33,17 @@ namespace TinySTL{
 		Unordered_set(InputIterator first, InputIterator last);
 		//Unordered_set(const Unordered_set& ust);
 		//Unordered_set& operator = (const Unordered_set& ust);
+
+		size_type size()const;
+		bool empty()const;
+		size_type bucket_count()const;
+		size_type bucket_size(size_type i)const;
+		size_type bucket(const key_type& key)const;
+		float load_factor()const;
+
+		haser hash_function()const;
+		key_equal key_eq()const;
+		allocator_type get_allocator()const;
 	private:
 		size_type next_prime(size_type n)const;
 		size_type bucket_index(const key_type& key)const;