Maestro questions

• C++ primer 5th edition: Difference between the deleter of a shared_ptr and of unique_ptr's
• C++ primer 5 ed. : using sort on a vector of pointers is it undefined?
• C++ primer 5th ed function template specialization
• Why c++ allows default template argument that can never be used?
• How is a stream tied to another flushed?
• How to invoke a class's default constructor whose one is provided by a ctor with all default paramters?
• Is modifying an object more than once in an expression through its name and through its reference well-defined?
• Why doesn't std::extent work on references to arrays like operator sizeof?
• C++ primer 5th ed. function template overloading
• Can a non-throwing function pointer point to a throwing-function?

Maestro answers