Create shared_ptr.cpp

Author: keineahnung2345

shared_ptr.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+#include <memory>
+
+class Rectangle {
+public:
+    Rectangle(int w, int h) : width(w), height(h) {}
+    ~Rectangle() { std::cout << "Rectangle destructor" << std::endl; }
+    int getArea() { return width * height; }
+private:
+    int width;
+    int height;
+};
+
+int main(){
+    Rectangle* rectp = new Rectangle(5, 3);
+    std::shared_ptr<Rectangle> rectsp1(rectp);
+    std::shared_ptr<Rectangle> rectsp2(rectp);
+    //rectsp1.reset(rectp);
+    std::cout << rectsp1->getArea() << std::endl;
+    return 0;
+}
+
+/*
+15
+Rectangle destructor
+Rectangle destructor
+free(): double free detected in tcache 2
+中止 (核心已傾印)
+*/