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Compiler Warning (level 1) C4544

  • Article

'declaration': Default template argument ignored on this template declaration

A default template argument was specified in an incorrect location and was ignored. A default template argument for a class template can only be specified in the declaration or definition of the class template and not on a member of the class template.

This sample generates C4545, and the next sample shows how to fix it:

// C4544.cpp
// compile with: /W1 /LD
template <class T>
struct S
{
   template <class T1>
      struct S1;
   void f();
};

template <class T=int>
template <class T1>
struct S<T>::S1 {};   // C4544

In this example, the default parameter applies to class template S:

// C4544b.cpp
// compile with: /LD
template <class T = int>
struct S
{
   template <class T1>
      struct S1;
   void f();
};

template <class T>
template <class T1>
struct S<T>::S1 {};