Archived

This topic is now archived and is closed to further replies.

A not-so-quick question about templates!

This topic is 5967 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Hi all, I''m back with problem no. 2 : I have a class which stores a pointer to a templated object. I want the normal class to set its pointer to point to any instance of that template, e.g.: template class TemplatedClass { ... private: T m_SomeData; ... }; class NormalClass { private: ... TemplatedClass< T > * m_Link; ... public: ... void SetData( TemplatedClass< T > * NewLink ) { m_Link = NewLink; } ... }; So, I create a TemplatedClass with, say, an ''int'' as the data type. The problem occurs when I try to set the pointer in the NormalClass to point to a specific TemplatedClass object, e.g.: NormalClass normal; TemplatedClass< int > *templated = new TemplatedClass< int >; normal.SetData( templated ); VC++ produces an error at the "normal.SetData( templated );" line, saying: error C2664: ''SetHead'' : cannot convert parameter 1 from ''class TemplatedClass< int > *'' to ''class TemplatedClass< T > *'' So it seems to me that you can''t pass templated objects as member function parameters. Is there a solution to this problem, or was I simply over-estimating the usefulness of a template? Thanks again, Gareth

Share this post


Link to post
Share on other sites
The ''T'' means absolutely nothing to the compiler inside the ''NormalClass'' definition. It is looking for a class literally named T, which doesn''t exist. NormalClass needs to be templatized on class T (although it doesn''t have to be called T, it can be anything) as well so that the member m_Link and the parameter NewLink know what type they will point at.

(PS: Please don''t post the same question in 2 threads...)

Share this post


Link to post
Share on other sites

This topic is 5967 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Guest
This topic is now closed to further replies.