Re: Initializing std::map Objects

SG <sgesemann@gmail.invalid>
Mon, 24 Jun 2013 09:15:10 +0200
Am 23.06.2013 19:57, schrieb Mike Copeland:

   I have the following structure and declarations, and I'm looking for
any simple way to initialize a set of default values.

struct TSINFO
   string tsDescr; // T-Shirt name
   string tsValue; // source T-Shirt value
   char tsCode; // T-Shirt code (cShirt)
   char tsGender; // T-Shirt gender version
   int tsCount; // count of T-Shirts of this type
} extern tsWork;
typedef map<char, TSINFO> shirtLUMap;
   shirtLUMap tsLUMap;
   shirtLUMap::iterator tsluIter; // lookup iterator

   That is, I wish to create, say, 5 objects with specific values and
store them into the map. For example,
  tsWork.tsCode = 'S';
  tsWork.tsGender = 'U';
  tsWork.tsCount = 0;
  tsWork.tsValue = "";
  tsWork.tsDescr = "Small";
  shirtLUMap['S'] = tsWork;
  tsWork.tsCode = 'M';
  tsWork.tsGender = 'U';
  tsWork.tsCount = 0;
  tsWork.tsValue = "";
  tsWork.tsDescr = "Medium";
  shirtLUMap['M'] = tsWork;
  tsWork.tsCode = 'A';
  tsWork.tsGender = 'F';
  tsWork.tsCount = 0;
  tsWork.tsValue = "";
  tsWork.tsDescr = "Female X-Small";
  shirtLUMap['A'] = tsWork;

   Such code is tedious, and I'd like to learn some way to "shorthand"
the process of declaring certain default values. Using a non-default
constructor seems useful, but I don't know how I'd do it here... Please
advise.. TIA

Try this:

   shirtLUMap tsLUMap = {
     {'S', {"Small" ,"",'S','U',0}},
     {'M', {"Medium","",'M','U',0}},
     {'A', {"Female X-Small","",'A','F',0}}

in C++11 mode (untested).

But I also liked David's suggestion. You could even ged rid of the named
TSINFO object in his example by writing



   void addEntry(shirtLUMap & map, ...params...);
      TSINFO & tsi = map[tsCode];
      tsi.tsCode = tsCode;
      tsi.more = more;

But maybe you should rethink the whole data structure. It does not look
like a smart choice if you want to use it as a database for all
available T-Shirts.

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