C++ decltype deducing current function returned type

Question

I would like to automatically deduce the returned type of the function I'm writing.

Example:

std::vector<int> test(){     decltype(this_function) ret;     ret.push_back(5);     ret.push_back(9);     return ret; } 

So far the best I've achieved is

std::vector<int> test(){     decltype(test()) ret;     ret.push_back(5);     ret.push_back(9);     return ret; } 

Which works but:

1. If I change function name I must change

   decltype(test())

   into

   decltype(name())

2. If I change function parameters I must change as well

   decltype(test())

   into

   decltype(test(param1, param2))

Is there a more elegant way of doing the same?

Answer 1

Name the return type?

template <typename T=std::vector<int>> T test(){     T ret;     ret.push_back(5);     ret.push_back(9);     return ret; } 

Please don't make me constrain this with enable_if.