Bikineev questions

• Why aren't string literals constexpr by default? [duplicate]
• C++ Undefined Behavior when subtracting pointers
• C++ partial ordering for a function with default argument
• C++ non-type template parameter const char*
• string_view behaviour when passing temporary std::string
• C++11 aggregate initialization for classes with non-static member initializers
• C++14 value-initialization with deleted constructor

Bikineev answers