c++ - 从 C++ 中的结构访问单个成员类型的所有元素

Question

假设我在 C++ 中有以下结构

struct Fruit
  {
     std::string name, description;
  }

和

struct Fruit Fruits[]
  {
    {"orange"," Orange is a hybrid of ancient cultivated origin, possibly between pomelo and mandarin. "},
    {"apple", " Apple is the pomaceous fruit of the apple tree, species Malus domestica in the rose family. "},
  };

我的问题是，如何在 C++ 中访问一个结构的单个成员类型的所有元素，或者在这种情况下如何列出结构 Fruit 中成员类型名称的所有元素？

如有任何帮助，我们将不胜感激。提前致谢。

Answer 1

也许你需要一个动态的梨数组:

#include <vector>
#include <string>
#include <utility>
#include <iostream>

std::vector<std::pair<std::string, std::string>> fruits {
   { "Apple", "Yum" },
   { "Tomato", "Yuck" }
};

你可以重复这个:

for (auto it = fruits.cbegin(), end = fruits.cend(); it != end; ++it)
{
    std::cout << "Fruit: " << it->first << ", Description: " << it->second << "\n";
}

或者使用时髦的新 range-for-loop:

for (auto const & p : fruits) { /* ... p.first etc ... */ }