chapter 6 code

ch6/stack.cpp

@@ -0,0 +1,62 @@
+#include <exception>
+#include <iostream>
+#include <stack>
+#include <memory>
+#include <thread> 
+#include <mutex>
+
+template <typename T>
+class stack
+{
+  private:
+    std::stack<T> data;
+    mutable std::mutex m;
+
+  public:
+    stack(){}
+
+    stack(const stack& other)
+    {
+        std::lock_guard<std::mutex> lock(other.m);
+        data = other.data;
+    }
+
+    stack& operator=(const stack&) = delete;
+
+    void push(T new_value)
+    {
+        std::lock_guard<std::mutex> lock(m);
+        data.push(new_value);
+    }
+
+    std::shared_ptr<T> pop()
+    {
+        std::lock_guard<std::mutex> lock(m);
+        if (data.empty()) throw std::underflow_error("empty stack");
+        std::shared_ptr<T> const res(new T(data.top()));
+        data.pop();
+        return res;
+    }
+
+    void pop(T& value)
+    {
+        std::lock_guard<std::mutex> lock(m);
+        if (data.empty()) throw std::underflow_error("empty stack");
+        value = data.top();
+        data.pop();
+    }
+
+    bool empty() const
+    {
+        std::lock_guard<std::mutex> lock(m);
+        return data.empty();
+    }
+};
+
+int main()
+{
+    stack<int> s;
+    s.push(1);
+    std::cout << *s.pop() << std::endl;
+}
+