Can I add a deduction guide to `std` namespace?
问题 Suppose I want to make a new deduction guide making the following possible ? std::string str; std::basic_string_view sv = str; Would that be an Ok customization ? 回答1: [namespace.std]/2.4: The behavior of a C++ program is undefined if it declares [...] a deduction guide for any standard library class template. 来源： https://stackoverflow.com/questions/58992794/can-i-add-a-deduction-guide-to-std-namespace