为ref添加deleter

TinySTL/Detail/Ref.h

@@ -2,27 +2,44 @@
 #define _REF_H_
 
 #include <atomic>
+#include <functional>
+#include <memory>
 
 namespace TinySTL{
 	namespace Detail{
+		template<class T>
+		struct _default_delete{
+			void operator ()(T* ptr){ if (ptr) delete ptr; }
+		};
+
 		template<class T>
 		struct ref_t{
+			using deleter_type = std::function < void(T*) >;
+
 			std::atomic<size_t> ncount_;
 			T *data_;
-			
-			explicit ref_t(T *p = nullptr): ncount_(0), data_(p){
+			deleter_type deleter_;
+
+			explicit ref_t(T *p = nullptr, deleter_type pfunc = deleter_type(_default_delete<T>()))
+				: ncount_(0), data_(p), deleter_(pfunc){
 				if (data_)
 					ncount_ = 1;
 			}
 			ref_t(const ref_t&) = delete;
 			ref_t& operator = (const ref_t&) = delete;
 
+			~ref_t(){
+				--ncount_;
+				if (ncount_ == 0)
+					deleter_(data_);
+			}
+
 			size_t count()const{ return ncount_.load(); }
 			T *get_data()const{ return data_; }
 
-			ref_t& operator ++(){ 
-				++ncount_; 
-				return *this; 
+			ref_t& operator ++(){
+				++ncount_;
+				return *this;
 			}
 			ref_t operator ++(int){
 				auto t = *this;

TinySTL/Test/RefTest.cpp

@@ -7,8 +7,8 @@ namespace TinySTL{
 			assert(r1.count() == 0);
 			assert(r1.get_data() == nullptr);
 
-			int n = 0;
-			ref_t<int> r2(&n);
+			int *p = new int(0);
+			ref_t<int> r2(p);
 			assert(r2.count() == 1);
 			assert(r2.get_data() != nullptr);