c++ - variables not initializing in my constructor -

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so problem simple, data initalizing in constructor not saving @ all.

basically have pin pointed 1 point. have constructor in class

strset::strset(std::string s){ std::vector<std::string> strvector; strvector.push_back(s); }

and in main file have 

        else if(command == "s"){         cout << "declare (to singleton). give set element:";         cin >> input >> single_element;         vector_info temp;         temp.name = input;         strset set(single_element);         set.output();         temp.vector = set;         list.push_back(temp);     }

when constructor called , check length of vector answer appropriate, when check length of vector in output, resets 0?

can me, appreciated!!!!!!!

edit

this .h file

class strset { private:     std::vector<std::string> strvector;     // empty (when constructed)     bool issorted () const;  public:     strset ();  // create empty set     strset (std::string s); // create singleton set      void nullify (); // make set empty     bool isnull () const;     int size() const;      void output() const;      bool ismember (std::string s) const;      strset  operator +  (const strset& rtside);  // union     strset  operator *  (const strset& rtside);  // intersection     strset  operator -  (const strset& rtside);  // set subtraction     strset& operator =  (const strset& rtside);  // assignment  };  // end of strset class

looks, class body has strvector, declaring again in constructor, wrong, because compiler referenced new local strvector , not class strvector.

you need change constructor to:

strset::strset(std::string s){    strvector.push_back(s); }

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