Lets say I have a C++ library (QT, for example) built with /std:c++17 and a C++ app built with /std:c++20 that uses the library.
What will happed if in my app I call a function like std::string QString::toStdString() const implemented in the library?
Does std::string in my app differ from std::string in the library?
Comiler: MSVC2019 or CLang 12.