I think it's impossible or very dangerous to send pointer / reference to dynamic loaded library from another compiler or ever another languages like C#. And I want to find proofs, but C++ standard documentation is pretty huge.
I think null terminated string will work fine, but how about std::string, or maybe string_view?
C++ does not standardize ABI.
In practice, different std::string implementations may employ small string optimization differently tuned (with different buffer size), or no small string optimization. They may also have different order of fields. Additionally, std::allocator that allocates std:;string by default from different implementations may use different arenas.
std::string_view is more likely to match, though there could be variations (two pointers or pointer and size). Debug versions may have some additional information.
