Assigning C Function Pointers to Lambdas
Explore how to convert lambdas without captures to C function pointers using the plus operator. Understand why lambdas with captures have unique types and how to store them with std::function. This lesson helps you handle callbacks in C++ effectively when integrating with C libraries or legacy code.
We'll cover the following...
We'll cover the following...
Lambdas as function pointers
Lambdas without captures can be implicitly converted to function pointers. Let's say we are using a C library, or an older C++ library, that uses a callback function as a parameter, like this:
The callback is called with a return code and some downloaded content. It is possible to pass a lambda as a parameter when calling download_webpage(). Since the callback is a regular function pointer, the lambda must not have any captures and we have to ...