Template Definition Outside Class

In the definition of a class template or in the definition of a member of such a template that appears outside of the template definition for each non dependent base class if the name of the base class or the name of a member of the base class is the same as the name of a template parameter the base class name or member name hides the.

Template definition outside class. But when we implement this procedure for template classes some compilation and linking problems will arise. The common procedure in c is to put the class definition in a c header file and the implementation in a c source file. In the following example the class template key is declared before it is defined. A class template must be defined before any use of a template class that requires the size of the class or refers to members of the class.

Each templated member function declared outside the class declaration needs its own template declaration. The first member function is fine but the template member function which handles types other than the base type of the template class is where i am having problems. A class template by itself is not a type or an object or any other entity. The class template is then used as the template argument for the friend class.

For the above case i get the following errors. No code is generated from a source file that contains only template definitions. Note that we ve also defined the getlength function outside of the class declaration. This isn t necessary but new programmers typically stumble when trying to do this for the first time due to the syntax so an example is instructive.

When you call a member function of a class template specialization the compiler will use the template arguments that you used to generate the class template. Member functions of class templates c only you may define a template member function outside of its class template definition. Friend class templates must be defined outside of the class template in which they are declared.