xcrypt questions

• How to draw lines with a certain amount of thickness
• Is a function return-value constant by default (an rvalue)?
• release mode error, but not in debug mode
• call to constructor can be considered as function declaration?
• How to avoid excessive screen flickering with GDI
• Why do we use data structures? (when no dynamic allocation is needed)
• std::less<> not working with my std::map
• Hiding non-member functions in header files
• Is there reason we are able to define [static const int] in a class definition, but not other static const types? [duplicate]
• Can an object be considered as a variable?

xcrypt answers