lst-0073-godb.cpp
//#(compile) c++; compiler:g132; options:-O3 -std=c++23; libs:-
// https://godbolt.org/z/jqzTMxYKv
template <std::copyable T> // C++20 concept
class MyContainer {
T data_;
public:
void setData(const T& d) { data_ = d; }
T getData() const { return data_; }
};