Can you elaborate what you envision there? For reference, a lambda in C++ might look like this: auto sqr = [](double val) { return val * val; }; (The lamb

Can you elaborate what you envision there? For reference, a lambda in C++ might look like this: auto sqr = [](double val) { return val * val; }; (The lambda expression is technically only the part after the =, but storing it into a variable is common enough). How would you use decltype here?