std::function and std::bind causing advanced patterns in C++17 with lambda capture
I've searched everywhere and can't find a clear answer... I've been banging my head against this for hours. I'm working with an unexpected scenario when trying to use `std::function` in combination with `std::bind` and lambdas in my C++17 project. I have a scenario where I'm trying to bind a member function to a specific object and capture additional parameters using a lambda. However, I'm observing that the bound function does not behave as expected; it seems to lose the context of the captured variables. Here is a simplified version of my code: ```cpp #include <iostream> #include <functional> #include <string> class MyClass { public: void printMessage(const std::string &msg) { std::cout << msg << std::endl; } }; int main() { MyClass obj; auto boundFunc = std::bind(&MyClass::printMessage, &obj, std::placeholders::_1); std::string additionalMsg = "Hello from lambda!"; auto lambdaFunc = [&]() { boundFunc(additionalMsg); }; lambdaFunc(); // Expected to print the message additionalMsg = "Changed message!"; lambdaFunc(); // Should print the updated message } ``` When I run this code, the first call to `lambdaFunc()` works as expected, printing "Hello from lambda!". However, the second call to `lambdaFunc()` results in a compilation behavior: ``` behavior: no matching function for call to ‘std::function<void(std::string)>::operator()(std::string&)’ ``` I tried changing the capture in the lambda to `[additionalMsg]` instead of `[&]`, but that only leads to it printing the initial state of `additionalMsg`. It seems like `std::bind` isn't playing nicely with the lambda capture. I also considered using an inline lambda directly, but I prefer the readability of using `std::bind`. Can anyone shed light on why this is happening? How can I correctly capture and pass the updated value of `additionalMsg` without running into compilation issues? For context: I'm using C++ on Windows. I'd really appreciate any guidance on this. Any advice would be much appreciated. I'm using C++ 3.10 in this project. Has anyone dealt with something similar? Thanks for your help in advance!