The standard explicitly states that main
has two valid (i.e., guaranteed to work) signatures; namely:
int main();
int main(int, char*[]);
My question is simple, would something like the following be legal?
int main(const unsigned int, const char* const* argv);
My tests say 'yes', but I'm unsure of the answer because am I not overloading main
by changing int
to unsigned int
as well as the non top-level const
-ness of argv? If I am, then that's clearly prohibited.
So, are these modifications guaranteed to work on a standards conforming compiler?
The C++98 standard says in section 3.6.1 paragraph 2
An implementation shall not predefine the main function. This function shall not be overloaded. It shall have a return type of type
int
, but otherwise its type is implementation-defined. All implementations shall allow both the following definitions ofmain
:int main()
andint main(int argc, char* argv[])
So it's not mandated by the standard that the env accepting main
is acceptable but it is permissible.
Because this is referred to often, here is the previous paragraph exempting freestanding environments from anything but documenting their behavior:
A program shall contain a global function called main, which is the designated start of the program. It is implementation defined whether a program in a freestanding environment is required to define a main function. [Note: in a freestanding environment, startup and termination is implementation defined; startup contains the execution of constructors for objects of namespace scope with static storage duration; termination contains the execution of destructors for objects with static storage duration. ]