Help me with “template parameters not used in partial specialization”?

Template // { enum { val = 1 } By the way, its not partial specialization if True isn't template argument. It is full specialization And since this is full specialization, you cannot define it inside the class, i. E at class-scope.

Full specialization can be defined only at namespace-scope. So define Value primary well as the specialization, at namespace scope Or, you can do this instead: template struct CanPrint { //modified template struct Value { enum { val = 0 }; }; //modified - now its partial specialization template struct Value { enum { val = 1 }; }; enum { value = Value >::val }; //modified here as well } See the online demo : ideone.com/MSG5X.

Template // { enum { val = 1 }; By the way, its not partial specialization if True isn't template argument. It is full specialization . And since this is full specialization, you cannot define it inside the class, i.

E at class-scope. Full specialization can be defined only at namespace-scope. So define Value , primary well as the specialization, at namespace scope.

Or, you can do this instead: template struct CanPrint { //modified template struct Value { enum { val = 0 }; }; //modified - now its partial specialization template struct Value { enum { val = 1 }; }; enum { value = Value >::val }; //modified here as well }; See the online demo : ideone.com/MSG5X.

1 Indeed. Yet I can't make a full specialization inside a namespace-scope. Do I really HAVE to get out of that namespace?

– The-Snake Jun 18 at 9:03 @The-Snake:. Yes – Nawaz Jun 18 at 9:10.

Template // note the empty struct Value { enum { val = 1 }; }; You only list parameters for partial specializations: template struct X; template struct X {...}; template struct X, U> {...}; Not for fully specializations: template struct X {...}.

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