Create 3. weak_ptr.cpp

1 files changed, 60 insertions, 0 deletions

diff --git a/Smart_pointers/3. weak_ptr.cpp b/Smart_pointers/3. weak_ptr.cpp
new file mode 100644
index 0000000..266ae3a
--- /dev/null
+++ b/Smart_pointers/3. weak_ptr.cpp
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+/******************************************************************************
+
+Online C++ Compiler.
+Code, Compile, Run and Debug C++ program online.
+Write your code in this editor and press "Run" button to compile and execute it.
+
+*******************************************************************************/
+
+#include <iostream>
+#include <memory> 
+
+using namespace std;
+
+class Test
+{
+public:
+	Test()
+	{
+		cout << "Test()" << endl;
+	}
+	Test(const Test& other)
+	{
+		cout << "Copy constructor" << endl;
+	}
+	Test& operator=(const Test& other)
+	{
+		cout << "Assignment operator" << endl;
+	}
+	~Test()
+	{
+		cout << "Detructor" << endl;
+	}
+	void f()
+	{
+
+	}
+
+};
+int main()
+{
+
+
+	shared_ptr<Test> smart_pointer_1(new Test());
+
+	cout << smart_pointer_1.get() << endl; //адресът на обекта.
+
+	weak_ptr<Test> smart_pointer_2(smart_pointer_1);
+
+	cout << smart_pointer_2.use_count() << endl;  // 1 - weak_ptr НЕ участва в бройката на пойнтерите към обектите.
+
+	//smart_pointer_2->f(); ГРЕШКА!	    
+	//Това е само за временен достъп! Ако искате да достъпите данните на този пойнтер трябва да го превърнете в shared_ptr!.
+
+	shared_ptr<Test> smart_pointer_3 = smart_pointer_2.lock();
+
+	cout << smart_pointer_1.use_count() << endl;//2
+
+	smart_pointer_3->f(); // .. и тн.
+
+}