Swift has: Strong References Weak References Unowned References How is an unowned reference different from a weak reference? When is it safe to use an unowned reference? Are unowned reference...

I don't understand concept of dangling pointer, was googling around, and writing test methods to find one. I just wonder is this a dangling pointer? As whatever example I found was returning someth...

It's common knowledge that returning a pointer to a stack variable is generally a bad idea: int* foo() { int i = 0; return &i; } int main() { int* p = foo(); } In the example above, my und...

I've read How to demonstrate memory leak and zombie objects in Xcode Instruments? but that's for objective-c. The steps don't apply. From reading here I've understood zombies are objects which ar...

During constant expression evaluation in C++17, shall the compiler consider any pointer addressing a valid object unequal to any pointer addressing an object after the end of its lifetime? For exam...

We can only de-reference a valid pointer and we can only check the address that a dangling built-in pointer points to. We cannot access its value (the value in the address of object it is poi...

I'd think that the VS2019 suggestion would create a dangling reference situation, but I tested it out, and it seems to work. What is happening here? template<typename MessageType> class Q...

What set of GCC options provide the best protection against memory corruption vulnerabilities such as Buffer Overflows, and Dangling Pointers? Does GCC provide any type of ROP chain mitigation? Are...

Consider a method that returns a std::string_view either from a method that returns a const std::string& or from an empty string. To my surprise, writing the method this way results in a dangli...

According to an article (here and there) this code is an erroneous use-after free example: #include <iostream> #include <string> #include <string_view> int main() { std::string...

std::string &func(int vlu) { std::string str; str = std::to_string(vlu) + "something"; return str; } the function above is unsafe clearly. Following is another version. std::string &amp...

I have a pointer and by default it carries NULL then it waits for some event and gets a value if the event happens, later I am freeing the pointer somewhere else but even after freeing the pointer ...

I'm trying to explain to someone why they have a dangling pointer and how free actually works (and that pointers are values and thus are passed-by-value), but for that I think I need a way to print...

I'm writing Python bindings for a C library that uses shared memory buffers to store its internal state. The allocation and freeing of these buffers is done outside of Python by the library itself,...

We have already known that use-after-free vulnerabilities could cause the security problems. Since the use-after-free error is born from dangling pointer, my question is that if the dangling pointe...

I have been reading Rust and Go in parallel and I see subtle differences in how both these languages deal with dangling pointers and the problems it causes. For example, here is a version in Rust: ...

I had to implement a function that looked like this: MyList * sum (MyList * l1, MyList * l2) { MyList * newlist = new MyList(); //Adds two objects and place the result in a third new list retur...

I have an inner lambda that uses one of the referenced variables of the outer lambda like this: int x=0; auto outer=[&](){ return [&](){ x=5; }; }; auto inner= outer(); inner(); ...

Clang 3.9 extremely reuses memory used by temporaries. This code is UB (simplified code): template <class T> class my_optional { public: bool has{ false }; T value; const T& get_or_...

std::vector has the member function at() as a safe alternative to operator[], so that bound checking is applied and no dangling references are created: void foo(std::vector<int> const&x)...

Is saying delete pointer and pointer = nullptr the same? Probably not, but does the latter free up memory? What about delete pointer; pointer = nullptr / pointer = nullptr; delete pointer? Wh...

I know that Undefined Behaviour, once it has happened, makes it impossible to think about the code any longer. I am convinced, completely. I even think I should not dig too much into understanding ...

Is it legal to compare dangling pointers? int *p, *q; { int a; p = &a; } { int b; q = &b; } std::cout << (p == q) << '\n'; Note how both p and q point to objects that hav...

I'm new to C++ and would like to ask if the code below is an example of a dangling pointer or a memory leak because it is pointing outside the dynamically allocated array: int * n = new int[10]; f...

In the stack, memory is reserved for main which we call stack frame for the main function. When we call the Add function, memory is reserved on top of the stack. In the Add function stack frame, a...