c++ - Implementing km/h and m/s with user-defined literals -

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I want to implement two, _kmh kilometers per hour, and _ms for meters per second. I already have work for two structures and operators: 

  constexpr kmoh operator "_ms" (long double val) {return khm {static_cast & lt; Double> gt; (Val * 3.6)}; } Constexpr MS Operator "" _kmh (long double val) {return MS {static_cast & lt; Double & gt; (Val / 3.6)}; }   
 I want to implement it in a way that I can do something like this:  
  void func (ms speed) {} Int main () {throw (10.0_kim); // It works fun (10.0_ms); // it is not}   
 I can not get the work to make another call, because I can not implement it like this:  
  constexpr KMH operator "" _kmh (long double val) {return KM {static_cast & lt; Double & gt; (Val)};   
 This clearly gives me an error  
 
 Error: Functions that differ only in their return types, they can not be overloaded   
 Is there a way to implement what I want?   
 
 
 You can specify without explicit  operator MS ()   
  MH of class {public: operator MS () console {returns} {val / 3.6}; } // your past luggage};   
 or not clear  Creator  in  MS  which  km   
  class MS {public: CONSTEXPRP MS (CON's MH & KNESH): Well (kmh.val * 3.6) {} // your previous thing};   
 BTW, you can live with only one structure ( MS ) and all your  operators "_ms , " "_kmh  returns  MS

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