Cannot figure out how to call parent constructor in c++

Question

I am having issues calling a parent constructor from an inherited class.

Here is how I am trying to call the function:

pFile = fopen(filePath.c_str(), "r");
if (pFile == NULL) {
    std::cout << "Error opening file" << std::endl;
}

StatusObj status();

Subclass mcrf_(pFile, status);

and here is the subclass definition

class Subclass : public Superclass {
public:
    Subclass(FILE * f_ptr, StatusObj status) : SuperClass(f_ptr, status) {}
};

the SuperClass's constructor looks like this:

SuperClass( FILE * input, StatusObj & status, uint64_t src_id=0 );

So at this point I think I am doing everything right, however when I try to compile I am getting the following error:

/main.cpp:152: error: no matching function for call to ‘SubClass(FILE*&, StatusObj (&)())’
/SubClass.h:23: note: candidates are: SubClass(FILE*, StatusObj)

I know I have a pointer or reference off somewhere - can anyone lend a hand and help me locate it?

Thanks!

Possible duplicate of [Is no parentheses on a constructor with no arguments a language standard?](http://stackoverflow.com/questions/2318650/is-no-parentheses-on-a-constructor-with-no-arguments-a-language-standard) — davidbak, Jun 14 '16 at 17:40

Jarod42 · Answer 1 · 2016-06-14T17:58:00.930

2

(Most) vexing parse for StatusObj status(); which is a function declaration.

Use

StatusObj status;

or

StatusObj status{};

edited Jun 14 '16 at 17:58

answered Jun 14 '16 at 17:36

Jarod42

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**NOT** a most vexing parse, though. – SergeyA Jun 14 '16 at 17:37
@SergeyA Inline function definition? – πάντα ῥεῖ Jun 14 '16 at 17:39
@πάνταῥεῖ, MVP is traditionally reserved for the cases like `A a(B());` – SergeyA Jun 14 '16 at 17:48
@SergeyA Ah, I see. I think I never got the MVP issue up to it's end. But what would be the correct term? `StatusObj status();` is an _inline funciotn declaration_? (definition was merely a typo above). – πάντα ῥεῖ Jun 14 '16 at 17:51
1

@πάνταῥεῖ I would simply say *a function declaration*, to avoid confusion with `inline` functions. MVP is not a standard term either, but *most* there relates to the complexity of the case - and nothing is complex about straightforward function declaration. (what else `A x();` could be after all?) – SergeyA Jun 14 '16 at 17:54

Cannot figure out how to call parent constructor in c++

1 Answers1