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E2408: Default values may be specified only in primary class template declarations (C++)

Template functions, and class partial specializations, may not use default expressions in their template parameter lists. Only primary template declarations may do this. For example:

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template<class T = int>
class foo;// OK: primary class template
template<class T = int>
void bar();// error: template function
template<class T = int>
class foo<T *>;// error: partial specialization
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