Here's the GCC implementation of `std::function`: https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/bits/std_function.h https://github.com

Here's the GCC implementation of `std::function`: https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/bits/std_function.h https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-... I'm with OP here.