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

-

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}},  " <" > <">"

Comments

Post a Comment

Popular posts from this blog

Pass DB Connection parameters to a Kettle a.k.a PDI table Input step dynamically from Excel -

-
Image
I have a requirement whenever I run my own kettle, dynamically took database connection parameters from an excel source Every run should go. I have an Excel column names: hostname, username, database, password. I want to pass these connection parameters to my table input stage dynamically whenever it runs the job. This is what I was trying to do. You can get it Connection parameters from the DB reading source (for example Excel or a CSV file in my example) < / Li> Store the parameters in the variable Using the variable in your connection's settings. Setting Variables Create another conversion for (you can not do it in the same conversion Uses): set variables element variable: The element that reads / writes your data creates a new connection and sets the connection parameter using $ {variable name_} Note that you will need to type in the field field in the field $ {password} Also keep in mind that this can be a security problem as the
Read more

multithreading - PhantomJS-Node in a for Loop -

-
I am trying to implement a screen-scraps application that opens a URL in which a parameter changes as it is for a loop: var data = [ '100', '101', '102', '103', '104']; (Var indexA = 0; indexA & lt; data.length; indexA ++) for {Phantom Generation ({'port': freeport}, function (pH) {ph.create page (function (page) {page.open ("http: //...++ data [index B] +" ... " , Status {console.log ("open site:" + data [index B], position); / * OLD * / indexB ++; page evaluation (function () {// page scrape and an object Return}, function {console.log (result.dataRequest); // here is the problem}); / * new and fixed * / indexB ++} first console Logs it: Open Site: 100 Success Opens Site: 101 Success B Ola Site: 102 Success Opening Site: 103 Success Opened Site: 104 Success Which is good. Data is verified in scrap HTML and from index to array Matches. So in page 101 I scrap '101 and retrieve' and pu
Read more

c++ - MATLAB .m file to .mex file using Matlab Compiler -

-
I know that it can speak as a very famous topic, but something that helps me with it Not found This scenario is: I have my functions function, no matter what's inside, it's a generic function that may depend on other toolboxes. Does. Has input and output; I want to generate the same myFun.mex function; : Lib myFun This way I get some new files: libmyfun.c libmyfun.dll Libmyfun.exp libmyfun.exports libmyfun .h libmyfun.lib Reading around and I think that Creating a myfun.cpp that is very famous is included: / * gateway function * / zero max function (ent NLHS, MXARRA * PLS [], int NRHS, CONST M Xeray * PHS []) Here is the Variable Deals * / / * code here * /} I have tried to do this and are called Regular of Max Generation: Max ('- v', 'myfun.cpp') But I get many errors, and I should say that my myfun.cpp copy / Paste Function is where I have a lot of doubts ... especially on input / output management. My q
Read more