c++ - Accessing a std::map of std::map like an array -

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I started a std :: map of the std :: map as the following: 

  static std :: map & lt; std :: string, std :: map & lt; Std :: string, float & gt; & Gt; _ScalingMapFrequency = {{"mHz", {{"mHz", 1.0}}}, {"mHz", {{"Hz", 1e-3}}}, {"hertz", {{"mHz", 1e + 3}}}, {"hertz", {{"Hz", 1.0}}}};   
 And now I am trying to use float values ​​in the following values:  
  std :: cout < & Lt; "Scaling factor is:" & lt; & Lt; _ScalingMapFrequency ["MHz"] ["Hertz"];   
 When I compile and run the code, but I expect to get "1e-3", then I'm always getting "0". I need to reach the std :: map "_ScalingMapFrequency" as an array, due to this design decision,  
 What am I doing wrong? Please give me some indicators and I would greatly appreciate it. A map can not be a duplicate key, so when you do  {"mHz", {{"Hertz", 1e-3}},  for the second time, it merge first, as if to merge them Is opposed.  
 You should change the constructor so that they can merge {{"{{" {{{{Hz}, 1e-3}},  " <" > <">"

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