c++ - 如何调用基于 cin c++ 的特定对象

Question

所以我试图消除我在 switch 语句中重复相同代码的方式，唯一的区别是什么对象正在获取 getAnswer() 方法。感谢任何帮助

#include "main.hpp"
#include "toolbox.hpp"
#include <iostream>
#include <chrono>

Problem1 problem1;
Problem2 problem2;
Problem3 problem3;
Problem4 problem4;
Problem5 problem5;
Problem6 problem6;
Problem7 problem7;
Problem8 problem8;
Problem9 problem9;
Problem10 problem10;
Problem11 problem11;
Problem12 problem12;
Problem13 problem13;
Problem14 problem14;
Problem15 problem15;
Problem16 problem16;

void Execute::print() {
    int choice;
do {
    std::cout << "Please enter the # of the problem you would like to solve: ";
    std::cin >> choice;
    std::cout << std::endl;
    switch (choice)
    {
    case 1:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem1.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 2:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem2.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 3:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem3.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 4:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem4.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 5:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem5.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 6:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem6.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 7:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem7.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 8:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem8.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 9:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem9.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 10:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem10.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 11:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem11.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 12:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem12.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 13:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem13.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 14:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem14.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 15:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem15.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    case 16:
    {
        auto timePoint1 = std::chrono::high_resolution_clock::now();
        std::cout << problem16.getAnswer() << std::endl;
        auto timePoint2 = std::chrono::high_resolution_clock::now();
        std::cout << std::endl;
        std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
        break;
    }
    default: std::cout << "Problem does not exist or is not solved yet" << std::endl;
    }

} while (choice != 17);

我是编程的新手，我只是在寻找一种解决方案，让我能够选择正确的类对象并将其打印出来，而无需占用太多​​空间的大型 switch 语句

Answer 1

使用功能模板，将细节移动到功能模板。

template <typename Problem>
void getAnswer(Problem& prob)
{
   auto timePoint1 = std::chrono::high_resolution_clock::now();
   std::cout << prob.getAnswer() << std::endl;
   auto timePoint2 = std::chrono::high_resolution_clock::now();
   std::cout << std::endl;
   std::cout << "Elapsed time: " << static_cast<std::chrono::duration<float>>(timePoint2 - timePoint1).count() << " seconds" << std::endl;
}

void Execute::print() {
   int choice;
   do {
      std::cout << "Please enter the # of the problem you would like to solve: ";
      std::cin >> choice;
      std::cout << std::endl;

      switch (choice)
      {
         case 1:
         {
            getAnswer(problem1);
            break;
         }

         case 2:
         {
            getAnswer(problem2);
            break;
         }

         // etc.
      }
   }
}