下午好！
我进行了一些快速搜索，但是我很难理解我应该如何去做我需要做的事情。
对于此程序，我们正在创建一个基本的工作单类。每个属性都有其自己的增变器和访问器，但除此之外，还有一个增变器，它将所有属性作为参数并将它们全部设置为一次性。
我不能仅仅使用构造函数来放置值的主要原因是因为对于此mutator，我们必须对值执行一些验证。对于单个属性更改器，其中两个已经在其更改器中执行了验证。其他两个仅在调用setWorkTicket mutator时才需要验证。
有没有办法从增变器内部调用增变器？还是确保它验证这两个属性的唯一方法是将其验证程序从其更改器复制并粘贴到setWorkTicket中？
如果您需要澄清，或者我要问的不清楚，请告诉我。我已经将有关的课程附上了。
/** Lab2.cpp
* @desc SOME DESCRIPTION
* @author Aaron, Aaron
* @since 24 September 2014
**/
#include <iostream>
#include <iomanip>
#include <string>
#include "MyInputValidation.h"
#include <sstream>
#include <stdexcept>
using namespace std;
class WorkTicket
{
public:
/*** PARAMETERIZED CONSTRUCTOR ***/
WorkTicket(): myWorkTicketNumber(0), myClientID(""), myDay(1), myMonth(1), myYear(2000), myIssue("") {}
WorkTicket(int workTicketNumber, string clientID, int day, int month, int year, string issue);
/*** ACCESSORS ***/
int getWorkTicketNumber() const { return myWorkTicketNumber; }
string getClientID() const { return myClientID; }
string getDate(int myDay, int myMonth, int myYear) const;
string getIssue() const { return myIssue; }
void showWorkTicket() const;
/*** MUTATORS ***/
void setWorkTicketNumber(int workTicketNumber);
void setClientID(string clientID) { myClientID = clientID; }
void setDate(int day, int month, int year);
void setIssue(string issue) { myIssue = issue; }
bool setWorkTicket(int workTicketNumber, string clientID, int day, int month, int year, string issue);
private:
int myWorkTicketNumber;
string myClientID;
int myDay;
int myMonth;
int myYear;
string myIssue;
};
/*** MAIN ***/
int main ()
{
// Output an information header
cout << "=============================" << endl
<< "=== WorkTicket Class Demo ===" << endl
<< "=============================" << endl;
try
{
// DECLARATIONS
WorkTicket ticketOne(1, "Aaron", 24, 9, 2014, "Printer not accessible from networked computers.");
ticketOne.showWorkTicket();
}
catch(const exception& ex)
{
cerr << ex.what(); // display the exception message.
}
// done.
cout << endl << endl;
return 0;
}
/*** PARAMETERIZED CONSTRUCTOR ***/
WorkTicket::WorkTicket(int workTicketNumber, string clientID, int day, int month, int year, string issue)
{
setWorkTicketNumber(workTicketNumber);
setClientID(clientID);
setDate(day, month, year);
setIssue(issue);
}
/*** ACCESSORS ***/
string WorkTicket::getDate(int myDay, int myMonth, int myYear) const
{
stringstream dateReturn;
dateReturn << myDay << "-" << myMonth << "-" << myYear;
return dateReturn.str();
}
void WorkTicket::showWorkTicket() const
{
cout << setw(20) << "\nWork Ticket Number: " << myWorkTicketNumber << endl
<< setw(20) << left << "Client ID: " << myClientID << endl
<< setw(20) << left << "Ticket Date: " << myDay << "-" << myMonth << "-" << myYear << endl
<< setw(20) << left << "Issue: " << myIssue << endl;
}
/*** MUTATORS ***/
void WorkTicket::setWorkTicketNumber(int workTicketNumber)
{
// Local declarations
const int MIN_TICKET_NUMBER = 1; // Ace
if(workTicketNumber < MIN_TICKET_NUMBER)
{
// declare a stringstream object
stringstream strOut;
// build a descriptive error string.
strOut << "\nTicket Number argument: " << workTicketNumber << " is out of range. " << endl
<< "Ticket Number must be greater than or equal to " << MIN_TICKET_NUMBER << ". ";
// throw an out_of_range exception initialized with
// the error string
throw invalid_argument(strOut.str());
}
else // otherwise, the rank parameter is fine
{
// assign the parameter to the member variable
myWorkTicketNumber = workTicketNumber;
}
}
void WorkTicket::setDate(int day, int month, int year)
{
const int MIN_DAY_MONTH = 1;
const int MAX_DAY = 31;
const int MAX_MONTH = 12;
const int MIN_YEAR = 2000;
const int MAX_YEAR = 2099;
stringstream strOut;
if(day < MIN_DAY_MONTH || day > MAX_DAY)
{
// build a descriptive error string.
strOut << "\nDate argument: " << day << " is out of range. " << endl
<< "Day must be greater than or equal to " << MIN_DAY_MONTH
<< " and less than or equal to " << MAX_DAY << ". ";
// throw an out_of_range exception initialized with
// the error string
throw invalid_argument(strOut.str());
}
else if(month < MIN_DAY_MONTH || month > MAX_MONTH)
{
// build a descriptive error string.
strOut << "\nDate argument: " << month << " is out of range. " << endl
<< "Month must be greater than or equal to " << MIN_DAY_MONTH
<< " and less than or equal to " << MAX_MONTH << ". ";
// throw an out_of_range exception initialized with
// the error string
throw invalid_argument(strOut.str());
}
else if(year < MIN_YEAR || year > MAX_YEAR)
{
// declare a stringstream object
stringstream strOut;
// build a descriptive error string.
strOut << "\nDate argument: " << year << " is out of range. " << endl
<< "Year must be greater than or equal to " << MIN_YEAR
<< " and less than or equal to " << MAX_YEAR << ". ";
// throw an out_of_range exception initialized with
// the error string
throw invalid_argument(strOut.str());
}
else // otherwise, the rank parameter is fine
{
// assign the parameter to the member variable
myDay = day;
myMonth = month;
myYear = year;
}
}
bool WorkTicket::setWorkTicket(int workTicketNumber, string clientID, int day, int month, int year, string issue)
{
return true;
}
最佳答案
这样做有什么问题：
bool WorkTicket::setWorkTicket(int workTicketNumber, string clientID, int day, int month, int year, string issue)
{
setWorkTicketNumber(workTicketNumber);
setDate(day, month, year);
setClientID(clientID);
setIssue(issue);
return true;
}
您可以让异常传播，也可以在
setWorkTicket()中捕获它们，然后根据需要返回false。关于c++ - 是否可以在C++中的Mutator中使用Mutator？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/26043435/