Aleksey Gurtovoy wrote:
Agoston Bejo writes:
Hello,
how do I express through template metaprogramming or in a similar way that a class is convertible to a template class for some T1? I.e., the condition: "There exists some T1 such that B is convertible to A<T1>".
Use overload resolution. The easiest way would probably be to take 'is_convertible' implementation for your compiler and replace the overload used to detect 'To' type convertibility with with a function temlate accepting 'A<T1>'.
But template argument deduction will fail, won't it, since user defined conversions aren't considered when deducing template arguments? Obviously, if the class is derived from A<T1> for some T1, then it should work, since the derived-to-base conversion is considered. Tom