std::function not invoking stored callable objects properly in C++17 with lambda capture
I tried several approaches but none seem to work. I'm optimizing some code but I'm following best practices but This might be a silly question, but I am working with an scenario with `std::function` in C++17 where it seems that the stored callable object is not being invoked correctly when using a lambda function that captures variables..... I have a lambda that captures a local variable by reference, and when I try to call the `std::function`, it either crashes my application or returns an unexpected result. Here is a simplified version of my code: ```cpp #include <iostream> #include <functional> #include <vector> int main() { int x = 10; std::function<void()> func; // Storing a lambda that captures x by reference func = [&x]() { std::cout << "Value of x: " << x << std::endl; }; // Simulating a situation where the lambda might be called later std::vector<std::function<void()>> funcStore; funcStore.push_back(func); // Changing x after storing the function x = 20; // Now invoking the stored function for (auto& f : funcStore) { f(); // Expected to print 20 } return 0; } ``` I expected this to print `Value of x: 20`, but instead, it sometimes prints the correct value and sometimes it crashes with a segmentation fault. I've checked that the lambda is being invoked after `funcStore` is filled, and I understand that the lambda captures the variable by reference. However, I suspect that the state of `funcStore` might be causing the question, especially if it retains references to local variables. I've tried changing the capture to `by value`, but then it would not reflect changes to `x`. Is there a recommended way to handle this scenario? Am I violating any best practices with `std::function` and capturing lambdas? Any insights would be greatly appreciated! I'm working on a web app that needs to handle this. Any ideas what could be causing this? This is happening in both development and production on Windows 11. Any suggestions would be helpful. I'm working in a Ubuntu 20.04 environment. What's the correct way to implement this? Any ideas how to fix this?