18.20.txt

Exercise 18.20: In the following code, determine which function, if any,
matches the call to compute. List the candidate and viable functions. What type
conversions, if any, are applied to the argument to match the parameter in each
viable function?

	namespace primerLib {
		void compute();
		void compute(const void *);
	}
	using primerLib::compute;
	void compute(int);
	void compute(double, double = 3.4);
	void compute(char*, char* = 0);
	void f()
	{
		compute(0);
	}

What would happen if the using declaration were located in main before the call
to compute? Answer the same questions as before.

By Faisal Saadatmand

The argument passed to compute inside of f() is of type const int.

candidate functions:
void compute()
void compute(const void *)
void compute(int) 
void(double, double = 3.4)
void compute(char*, char* = 0)

Viable functions:
all except compute()

void compute(int) is used because it is an exact match (top-level const is ignored)

If the using declaration were located in f() before the call to compute, it
will the outer scope declarations of compute.

candidate functions:
void compute()
void compute(const void *)

viable functions:
void compute(const void *)

Implicit conversion from int to const void * is permissible. (p. 161-162)