DataStructure.h

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#ifndef DATA_STRUCTURE_H
#define DATA_STRUCTURE_H

#include <string> //string
using namespace std;

namespace bridges {
    class Bridges; //forward declaration

    //  string constants  for use in constructing JSON
    //  representation of the data structure
    const string
    QUOTE = "\"",
    COMMA = ",",
    COLON = ":",
    OPEN_CURLY = "{",
    CLOSE_CURLY = "}",
    OPEN_BOX = "[",
    CLOSE_BOX = "]",
    OPEN_PARENS = "(",
    CLOSE_PARENS = ")";
    namespace datastructure {

        // Maximum number of elements that can be visualized
        constexpr int MAX_ELEMENTS_ALLOWED = 5000;

        class DataStructure {
                // Used for access to getDataStructureRepresentation()
                friend class bridges::Bridges;
                //          friend void Bridges::visualize();

            public:
                virtual ~DataStructure() = default;

                virtual const string getDStype() const = 0;

            private:
                virtual const string getDataStructureRepresentation() const = 0;

        };  //end of DataStructure class
    }
}   //end of bridges namespace
#endif