C++ compiler encodes the parameter types with function/method into a unique name. This process is called name mangling. The inverse process is called as demangling.
Example :
A::b(int, long) const is mangled as ‘b__C3Ail’.
For a constructor, the method name is left out.
That is A:: A(int, long) const is mangled as ‘C3Ail’.
