visual studio 2008 - C++: How to create multi-type and multi-dimensional array format? -

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i'm trying read similar array format php uses: 

"data" => array(     "keyname1" => "string",      "somearraykeyname" => array(         "keyname1" => "more strings",          "keyname2" => "bla bla",          "moar" => array(             "first" => 1,              "second" => 2,              "third" => "3",         ),         "keyname3" => 25,     ),      "keyname2" => 13.37,      "keyname3" => 1337,      "array without keynames" => array(         "keke",          "lala",          "lolo",     ), );

but stumbled upon on multiple possible types problem. how can done in c++ best way ?

i thinking create struct possible types each element:

struct generaltype {     char whichtype; // type using value     int intval;     float floatval;     string stringval; };

and when read element, decide value type get, , convert value correct type , set correct variable (intval, floatval or stringval). keep track type value using whichtype variable, can pick correct variable when use value.

is anywhere near approach?

also, theres problem; how can define std::vector without knowing depth of array beforehand? type vector<vector<generaltype> > if each element array itself. not elements arrays. so, dont know how solve std::vector. possible ?

first idea had, make key sequence string stored in std::map key, std::map value generaltype type, , way able define dimensional easily, , value want quickly, this:

mymap["data/somearraykeyname/moar"] = generaltypevalue; // value not used, marker only, can first item position in std::map easily. mymap["data/somearraykeyname/moar/first"] = generaltypevalue; // array "moar" key "first" value.

but method prevents me looping through elements specific array. although, keys sorted, should have correct order always; but, require me parse key each time, , check if array changed @ next element. work, not efficiently.

what other ideas there this?

edit: want able call n-dimension array like: array["data"]["somearraykeyname"]["moar"]["first"] , if value type array, able loop array if vector of generaltype

use boost::variant. remember type inside , pretty easy use.


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