nullptr with an example in C++
nullptr is a keyword introduced in C++11 to replace the ambiguous NULL. It represents a null pointer constant and eliminates overload resolution issues (which were typically just 0 or ((void*)0) in C/C++).
Using NULL or 0 caused ambiguity in overload resolution.
For example: nullptr removes this ambiguity:
func(nullptr); // Clearly calls func(char*)
