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I'm trying to make a convenient function template to retrieve different type of objects using tuple.

class Apple;
class Banana;
class Cherry;

typedef std::tuple<Apple, Banana, Cherry> Fruits;
Fruits fruits;


//When I try to use this, I get "Failed to specialize function template" error
template<std::size_t i>
decltype(std::get<i>(fruits)) getFruit()
   return std::get<i>(fruits)
ex) getFruit<APPLE>(); //error









Edited by lride

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I think the class types that you use in the tuple has to be defined and not just forward declared.

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