CODEWITHSUNDEEP
c++
johnw
johnw

Reputation: 51

how to typedef a class name within its class

Which of the following syntaxes is preferred or is legally correct:

template< class T >
struct S
{
    typedef std::vector< S       > V;
//  typedef std::vector< S< T >  > V;

Visual C++ and gcc accept either but C++Builder XE3 reports a "E2299 Cannot generate template specialization" error on the first.

Upvotes: 2

Views: 301

Answers (1)

ecatmur
ecatmur

Reputation: 157344

Both are correct; the class name is injected into the scope of the class: What feature of C++ lets template classes refer to themselves without template arguments?

The feature is used occasionally; for example, the Standard uses it in its specification of the Standard library, for conciseness. You might consider avoiding it in your own code for the sake of clarity.

Upvotes: 7

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