CODEWITHSUNDEEP
c++classoopobjectinstantiation
m4design
m4design

Reputation: 2180

What could possibly cause this error when declaring an object inside a class?

I'm battling with this assignment :)

I've got two classes: Ocean and Grid.

When I declare an object of the Grid inside the Ocean:

unsigned int sharkCount;
Grid grid;

The compiler/complainer says:

error C2146: syntax error : missing ';' before identifier 'grid'


Can you possibly predict what produces this error with the limited info I provided?

It seems that as if the Ocean doesn't like the Grid class. Could this be because of the poor implementation of the grid class. BTW the Grid has a default constructor.

Yet the error happens in compiling time!.

EDIT: They're each in separate header file, and I've included the Grid.h in the Ocean.h.

Upvotes: 1

Views: 146

Answers (3)

AndersK
AndersK

Reputation: 36092

In order for Grid to be used in your other class you either need to include the header of the Grid in the header or do a forward declaration of the class and declare it as a pointer in your class then instantiate it in your .cpp file.

class Grid;

class Ocean {
   Grid* grid;
};

or preferably :

class Ocean {
    boost::shared_ptr<Grid> grid;
};

Upvotes: 1

Charlie Martin
Charlie Martin

Reputation: 112414

We need the rest of the source, but there are a couple of possible answers:

  • Grid is being overloaded by something via a macro (#define)
  • the Grid class definition isn't being included.

Upvotes: 2

Jerry Coffin
Jerry Coffin

Reputation: 490673

My first guess would be that the definition of Grid simply isn't visible at the point that you've tried to use it in Ocean. Typically this happens if you have each in its own file, and haven't used a header to allow each to be "seen" by the other.

Upvotes: 2

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