Error Field Has Incomplete Type Class
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Error Field St_atim Has Incomplete Type
ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community error field info has incomplete type Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to fix an “field has incomplete type” error when field has incomplete type array using a forward declaration up vote 2 down vote favorite 1 This code throws the compiler error error: field ‘fTarget’ has incomplete type as noted in the comments. Why is this happening? I'm only assigning that field and not doing any operations that would need to know what is inside... or am I? Maybe it can't figure out the copy constructor? class FSRVertex; //fwd class FSREdge { public: char
Field Has Incomplete Type Template
fC; FSRVertex fTarget; //compiler error FSREdge(char c, FSRVertex target) : fC(c), fTarget(target) {} //compiler error }; class FSRVertex { public: boost::unordered_map
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Field Has Incomplete Type Struct C++
programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C++ classes refer to each other ( => error + field '…' has incomplete type) up vote 4 down vote favorite http://stackoverflow.com/questions/26637879/how-to-fix-an-field-has-incomplete-type-error-when-using-a-forward-declaration Classes in my application work like this: Creature has few fields with Actions. When these Actions must be run Creature calls someActionField->do(this). Action has method viod do(Creature* cr) and all information about what to do with this Creature. So, Creature must have Action field and know that Action has do method. Action must know that Creature has such fields like: Will, HP, etc... I've got creature.h #include "effect.h" #include "heedupdate.h" namespace Core { class http://stackoverflow.com/questions/6634572/c-classes-refer-to-each-other-error-field-has-incomplete-type Action; class Creature : public NeedUpDate { public: virtual ~Creature(); int HP; Action onHit; Action onDie; // ... }; } #endif And action.h #include "creature.h" namespace Core { class Action { public: Action(); virtual void _do(Creature* cr); virtual ~Action(); }; But in this case field `onDie' has incomplete type error appears. If I include action.h into creature.h - I use files 'before each other'. c++ class share|improve this question asked Jul 9 '11 at 11:56 Ben Usman 1,06511534 add a comment| 5 Answers 5 active oldest votes up vote 8 down vote accepted You Creature class has members of type Action. The compiler needs to know the full definition of the Action class to compile that - an incomplete type as produced with a forward declaration is not enough. The Action class only requires a pointer to a Creature object in that header. In that case, the compiler only needs to know that Creature will be defined at some point. In your specific case, you could get away with inverting the order in which you declare your classes. (i.e. forward-declare Creature in action.h, and include action.h in creature.h) share|improve this answer edited Jul 9 '11 at 12:10 answered Jul 9 '11 at 12:00 Mat 135k21234273 Yes, I caught that just a second before you posted that. :
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow http://stackoverflow.com/questions/19253775/how-to-solve-field-classname-has-incomplete-type-error the company Business Learn more about hiring developers or posting ads with us Stack http://stackoverflow.com/questions/28940940/g-error-field-has-incomplete-type Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to solve field 'classname' has incomplete type error up vote 0 down vote favorite I am has incomplete getting this error while implementing the following: class A; class B; class A { B b_obj ; //Here comes the error ... } class B { ... A a_object; ... } One thing I have observed is that if I shift class B upwards then it gets removed but since I am using two way linking, which also has class A's object in B hence I am not able to get rid has incomplete type of both the errors. c++ class field share|improve this question asked Oct 8 '13 at 16:54 notsogeek 7818 4 You want A to contain a B and B to contain an A? That's impossible. At least one will have to be a reference or pointer. –Mike Seymour Oct 8 '13 at 16:56 I'm afraid you'll have to rethink your design; there's no way to get around a circular dependence of that sort. Maybe one of the classes can hold a pointer to the other? –Praetorian Oct 8 '13 at 16:57 So why does the problem solves as for A a_object (no error there) –notsogeek Oct 8 '13 at 17:07 1 You may want to be clearer on the problem you're trying to solve, not the problem in your code, which Mike has quite-accurately described. If A is to contain a B, and B is to contain a reference or pointer to it's "owning" A, (or vice-versa), you may wish to bring that as clarity. This is highly likely an XY problem. –WhozCraig Oct 8 '13 at 17:36 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote It's called circular dependency problem. See this great answer for details how to solve it. share|impr
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up g++ error: field has incomplete type up vote 0 down vote favorite I'm trying to work with inner classes. I need to call get function from the nested class. What am I doing wrong? Thank you for your time! class Discriminant { private: float d; public: void calcDiscr(int temp_a,int temp_b,int temp_c) { d = (temp_b^2)-4*temp_a*temp_c; } float get_d() { return d; } class Result { private: float x1,x2; public: Discriminant tempObject1;//here comes the error void calcResult(int temp_a,int temp_b,int temp_c) { cout<<"object's d = "<