add original source

source/listing_3.4.cpp

@@ -0,0 +1,24 @@
+#include <exception>
+#include <memory>
+
+struct empty_stack: std::exception
+{
+    const char* what() const throw();
+};
+
+template<typename T>
+class threadsafe_stack
+{
+public:
+    threadsafe_stack();
+    threadsafe_stack(const threadsafe_stack&);
+    threadsafe_stack& operator=(const threadsafe_stack&) = delete;
+
+    void push(T new_value);
+    std::shared_ptr<T> pop();
+    void pop(T& value);
+    bool empty() const;
+};
+
+int main()
+{}