How to call a template member function? [duplicate]

Just found it:

According to C++’03 Standard 14.2/4:

When the name of a member template specialization appears after . or
-> in a postfix-expression, or after nested-name-specifier in a qualified-id, and the postfix-expression or qualified-id explicitly depends on a template-parameter (14.6.2), the member template name must be prefixed by the keyword template. Otherwise the name is assumed to name a non-template.

Correct code is:

b.template foo<T0>();