BAN: Add capacity() getter for Queue

BAN/include/BAN/Queue.h

@@ -45,6 +45,7 @@ namespace BAN
 		void clear();
 
 		bool empty() const;
+		size_type capacity() const;
 		size_type size() const;
 
 		const T& front() const;
@@ -186,6 +187,12 @@ namespace BAN
 		return m_size == 0;
 	}
 
+	template<typename T>
+	typename Queue<T>::size_type Queue<T>::capacity() const
+	{
+		return m_capacity;
+	}
+
 	template<typename T>
 	typename Queue<T>::size_type Queue<T>::size() const
 	{