在一个文件中创建字符串向量，并在另一个文件中使用它。

Question

我有很长的字符串列表，我想在它自己的.h文件中放置、定义和声明这些字符串。我希望将这些字符串分组为向量，并在不同的.h文件中使用这些值。第二个文件将std::find用于查看向量中是否存在字符串。向量是对字符串进行分组的好方法，还是应该使用另一种方法？

我有一个kitBreakdown.h .h文件将包含多个字符串向量，如下所示：

    #ifndef KIT_BREAKDOWN_H
    #define KIT_BREAKDOWN_H
    #include <vector>

    void setup(){
        std::vector<std::string> Bricks_Plates;
        Bricks_Plates.push_back("2_1_plate");        //4211398
        Bricks_Plates.push_back("2_1_brick");        //4211388
        Bricks_Plates.push_back("2_2_brick");        //4211387
        Bricks_Plates.push_back("4_1_plate");        //4211445
        Bricks_Plates.push_back("4_2_plate");        //4211444
        Bricks_Plates.push_back("6_2_plate");        //4211542
        Bricks_Plates.push_back("8_2_plate");        //4211449
        Bricks_Plates.push_back("2_1_smooth_plate"); //4211052
    }
    #endif

我想在另一个名为searchControl.h的文件中使用这些字符串，其中包含一个searchControl类来实现机器人搜索。

    #include "kitBreakdown.h"
    #include <algorithm>


    // The purpose of this class is to implement a search control structure
// So individual variables can be set up (limbs and cameras) before hand
// Search Geometry should be set and checked to ensure valid choices are made
    class SearchControl
    { ...
    private:
    void _init_search();
    ...

    std::vector<std::string> Bricks_Plates;
    };

    void SearchControl::_init_search()
    {...
    std::cout<<"What is your Desired Piece Type?\n";
    int i = 0;
      while (i==0)
      {
      std::cin >> _desired_piece;
        if (std::find(Bricks_Plates.begin(),Bricks_Plates.end(), _desired_piece) !=Bricks_Plates.end()) 
        {
        std::cout << "Cool. " << _desired_piece << " will go in one bin and anything else will go in another\n";
        i=1;
        }
        else {
        std::cout << "I don't recognize what you want\n";
        std::cout << "Your Choices are...\n";
          for (int j=0; j<Bricks_Plates.size(); j++) {
          std::cout<< Bricks_Plates[j]<< "\n";
          }
        std::cout << "Enter a new Desired Piece Type:\n";
        }
      }
    }

我希望这要求_desired_piece，检查_desired_piece是否在Brick_Plates向量中，并相应地执行if语句。但是，当我运行这段代码时，它没有输出Brick_Plates向量的任何元素。如何将第一个头文件中字符串的值传递给第二个头文件？

Answer 1

修改steup函数以返回所构建的向量：

#ifndef KIT_BREAKDOWN_H
#define KIT_BREAKDOWN_H
#include <vector>

std::vector<std::string> setup(){
    std::vector<std::string> Bricks_Plates;
    Bricks_Plates.push_back("2_1_plate");        //4211398
    Bricks_Plates.push_back("2_1_brick");        //4211388
    Bricks_Plates.push_back("2_2_brick");        //4211387
    Bricks_Plates.push_back("4_1_plate");        //4211445
    Bricks_Plates.push_back("4_2_plate");        //4211444
    Bricks_Plates.push_back("6_2_plate");        //4211542
    Bricks_Plates.push_back("8_2_plate");        //4211449
    Bricks_Plates.push_back("2_1_smooth_plate"); //4211052
    return Bricks_Plates;
}
#endif

并向SearchControl添加一个构造函数，该构造函数将其成员Bricks_Plates初始化为从安装程序返回的值：

#include "kitBreakdown.h"
#include <algorithm>

class SearchControl
{ ...
public:
    SearchControl():Bricks_Plates(setup()){}
private:
void _init_search();
...

std::vector<std::string> Bricks_Plates;
};

void SearchControl::_init_search()
{...
std::cout<<"What is your Desired Piece Type?\n";
int i = 0;
  while (i==0)
  {
  std::cin >> _desired_piece;
    if (std::find(Bricks_Plates.begin(),Bricks_Plates.end(), _desired_piece) !=Bricks_Plates.end()) 
    {
    std::cout << "Cool. " << _desired_piece << " will go in one bin and anything else will go in another\n";
    i=1;
    }
    else {
    std::cout << "I don't recognize what you want\n";
    std::cout << "Your Choices are...\n";
      for (int j=0; j<Bricks_Plates.size(); j++) {
      std::cout<< Bricks_Plates[j]<< "\n";
      }
    std::cout << "Enter a new Desired Piece Type:\n";
    }
  }
}

尽管R的注释在技术上是正确的，有时使用外部变量或全局变量是唯一的方法，但人们普遍认为使用全局语言是不好的风格。