Error C2027 Use Of Undefined Type
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C2027 Forward Declaration
a minute: Sign up error C2027: use of undefined type 'edge' up vote 0 down vote favorite I have this error occuring when trying to compile. I searched for help, but all answers focused on including separated files. But this is only one .cpp file, so it didnt help. I mentioned "class edge;" at the beginning of the code. I have error c2227 included iostream, string, map and set. Here is the code: ... using namespace std; class edge; class vertex{ public: string name; set
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Class Type Redefinition C++
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Pointer To Incomplete Class Type Is Not Allowed
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; http://stackoverflow.com/questions/23638156/error-c2027-use-of-undefined-type-edge it only takes a minute: Sign up C++ class use of undefined type up vote 4 down vote favorite 2 I have a class that I made that I am using in thread above the class. Even though I did a prototype of the class at the top it still throws off those errors error C2027: use of undefined type http://stackoverflow.com/questions/5918607/c-class-use-of-undefined-type 'foo' class foo; DWORD WINAPI demo(LPVOID param) { foo a; } class foo { public: int x; }; c++ class share|improve this question edited May 7 '11 at 1:53 James McNellis 245k46709847 asked May 7 '11 at 1:47 Drake 1,82962742 add a comment| 1 Answer 1 active oldest votes up vote 9 down vote accepted Even though I did a prototype of the class With a forward declaration of the class you can create pointers and references to the class. This is because pointers/references are represented the same across all classes/structs/etc. They're all just addresses of memory. So, for example, you could create a second class that can accept or contains pointers or references before fully defining the class, ie: class Bar { private: foo* aFoo; public: Bar(foo* foo2) : aFoo(foo2) {} }; However, until the compiler sees the full definition of the class, you can't instantiate it. Otherwise the compiler doesn't know how much memory to allocate and how to call the constructor and other methods. In most cases, C++ expects things to be defined before the
here for a quick overview of the site Help Center Detailed answers to any questions you might have http://stackoverflow.com/questions/1827265/error-c2027-and-error-c2227 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 http://www.gamedev.net/topic/633387-why-is-my-code-giving-me-error-c2027-use-of-an-undefined-type/ 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 use of you, helping each other. Join them; it only takes a minute: Sign up error C2027 and error C2227 up vote 0 down vote favorite I get error C2027: use of undefined type 'Bridge' and error C2227: left of '->receive' must point to class/struct/union/generic type on line *connection1->receive(newMessage,2); #include
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