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If the function is:
void foo(struct* bar)
{
}
And
struct foobar;
Is a single instance of struct, will the call
foo(foobar);
Be treated as if it were a pointer to a one member array? Will the call be legal or does it require an overload?
No, it will not. The call is not legal, and an overload could make the call work.
If a function needs a pointer to a
struct, then you have to give it a pointer to astruct. Arrays are special since they decay to a pointer to the first element.