C++ program An invoice contains a list of goods purchased in a store. One element of the list is a pair of goods - amount. To create an Invoice modeling class with fields: - list of purchased goods -...

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Extracted text: C++ program An invoice contains a list of goods purchased in a store. One element of the list is a pair of goods - amount. To create an Invoice modeling class with fields: - list of purchased goods - associative array (map) with key object Stock and value its price In the Invoice class to implement: • get () and set () methods for the list to work element by element • methods for adding and removing goods method for searching for a product by its code a method for calculating the amount paid for all purchases Add and change methods accept an Stock object as an argument. The search method returns a Stock object. class Stock { int code; std::string name; double valuePerUnit; int numberUnits; public: Stock::Stock() { code 0; %3D name = valuePerUnit = 1; numberUnits = 1; } Stock::Stock(int c, std::string n, double v, int nu) { code = c; name = n; valuePerUnit = v; numberUnits = nu; }