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Because incomplete types are not allowed as members, a structure or union type may not contain an instance of itself as a member, but is allowed to contain a pointer to an instance of itself.
Yes you can have a list in struct but you cannot initialise it with a field initialiser and instead you must use the constructor. Also note that you can not have a parameter-less constructor.
A structure can not refer itself directly. union VAL v; struct list * next; };
Because it is impossible to create memory layout for such structure.
I want to create a structure which contains a list of same structure like this:
#include <list>
struct Url
{
CString strUrl;
std::list<Url> children;
};
int main()
{
Url u1, u2;
u1.children.push_back(u2);
}
This code is not compiling. But when I replace std::list with std::vector it is working fine. How can I make this working with std::list?
Output window contains the following error.
c:\program files\microsoft visual studio\vc98\include\list(29) : error C2079: '_Value' uses undefined struct 'Url'
E:\test\Test.cpp(23) : see reference to class template instantiation 'std::list<struct Url,class std::allocator<struct Url> >' being compiled
c:\program files\microsoft visual studio\vc98\include\functional(185) : error C2079: 'value' uses undefined struct 'Url'
c:\program files\microsoft visual studio\vc98\include\list(285) : see reference to class template instantiation 'std::binder2nd<struct std::not_equal_to<struct Url> >' being compiled
E:\test\Test.cpp(23) : see reference to class template instantiation 'std::list<struct Url,class std::allocator<struct Url> >' being compiled
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