test09.cpp

chronolaw · chronolaw · commit aeac28a30f61 · 2020-02-28T12:35:12.000+08:00
diff --git a/section2/test08.cpp b/section2/test08.cpp
@@ -61,11 +61,84 @@ void case3()
 {
     using namespace std;
 
+    shared_ptr<int> ptr1(new int(10));
+    assert(*ptr1 = 10);
+
+    shared_ptr<string> ptr2(new string("hello"));
+    assert(*ptr2 == "hello");
+
+    auto ptr3 = make_shared<int>(42);
+    assert(ptr3 && *ptr3 == 42);
+
+    auto ptr4 = make_shared<string>("zelda");
+    assert(!ptr4->empty());
+}
+
+void case4()
+{
+    using namespace std;
+
     auto ptr1 = make_shared<int>(42);
-    assert(ptr1 && *ptr1 == 42);
+    assert(ptr1 && ptr1.unique() );
+
+    auto ptr2 = ptr1;
+    assert(ptr1 && ptr2);
+
+    assert(ptr1 == ptr2);
+    assert(!ptr1.unique() && ptr1.use_count() == 2);
+    assert(!ptr2.unique() && ptr2.use_count() == 2);
+}
+
+class DemoShared final
+{
+public:
+    DemoShared() = default;
+   ~DemoShared()
+   {
+       // do some blocking thing ...
+   }
+};
+
+class Node final
+{
+public:
+    using this_type     = Node;
+    //using shared_type   = std::shared_ptr<this_type>;
+    using shared_type   = std::weak_ptr<this_type>;
+public:
+    shared_type     next;
+public:
+    Node() = default;
+   ~Node()
+    {
+       using namespace std;
+       cout << "node dtor" << endl;
+    }
+};
+
+void case5()
+{
+    using namespace std;
+
+    auto n1 = make_shared<Node>();
+    auto n2 = make_shared<Node>();
+
+    assert(n1.use_count() == 1);
+    assert(n2.use_count() == 1);
+
+    n1->next = n2;
+    n2->next = n1;
+
+    assert(n1.use_count() == 1);
+    assert(n2.use_count() == 1);
+
+    if (!n1->next.expired()) {
+        auto ptr = n1->next.lock();
+        assert(ptr == n2);
+    }
 
-    auto ptr2 = make_shared<string>("god of war");
-    assert(!ptr2->empty());
+    //assert(n1.use_count() == 2);
+    //assert(n2.use_count() == 2);
 }
 
 int main()
@@ -75,6 +148,8 @@ int main()
     case1();
     case2();
     case3();
+    case4();
+    case5();
 
     cout << "smart_ptr demo" << endl;
 }
diff --git a/section2/test09.cpp b/section2/test09.cpp
@@ -21,12 +21,15 @@ class my_exception : public std::runtime_error
 
     my_exception() = default;
    ~my_exception() = default;
+private:
+    int code = 0;
 };
 
 [[noreturn]]
 void raise(const char* msg)
 {
-    throw runtime_error(msg);
+    throw my_exception(msg);
+    //throw runtime_error(msg);
 }
 
 void case1()

Original file line number	Diff line number	Diff line change
`@@ -21,12 +21,15 @@ class my_exception : public std::runtime_error`
`21`	`21`
`22`	`22`	`my_exception() = default;`
`23`	`23`	`~my_exception() = default;`
	`24`	`+private:`
	`25`	`+ int code = 0;`
`24`	`26`	`};`
`25`	`27`
`26`	`28`	`[[noreturn]]`
`27`	`29`	`void raise(const char* msg)`
`28`	`30`	`{`
`29`		`- throw runtime_error(msg);`
	`31`	`+ throw my_exception(msg);`
	`32`	`+ //throw runtime_error(msg);`
`30`	`33`	`}`
`31`	`34`
`32`	`35`	`void case1()`