如何基于向量< string>对结构的向量进行排序.在要排序的向量内? [英] How to sort a vector of structs based on a vector<string> within the vector to be sorted?

问题描述

根据结构向量中所有结构的每个向量中的第一个单词，按字母顺序对结构向量进行排序的最佳方法是什么?

What is the best way to alphabetically sort a vector of structures based on the first word in every vector of all the structures in the vector of structures?

struct sentence{
    vector<string> words;
};

vector<sentence> allSentences;

换句话说，如何基于单词[0]对allSentences排序?

In other words, how to sort allSentences based on words[0]?

编辑:我使用了以下解决方案:

I used the following solution:

bool cmp(const sentence& lhs, const sentence & rhs)
{
  return lhs.words[0] < rhs.words[0];
}

std::sort(allSentences.begin(), allSentences.end(), cmp);

推荐答案

提供合适的比较二进制函数并将其传递给std::sort.例如

Provide a suitable comparison binary function and pass it on to std::sort. For example

bool cmp(const sentence& lhs, const sentence & rhs)
{
  return lhs.words[0] < rhs.words[0];
}

然后

std::sort(allSentences.begin(), allSentences.end(), cmp);

或者，在C ++ 11中，您可以使用lambda匿名函数

Alternatively, in C++11 you can use a lambda anonymous function

std::sort(allSentences.begin(), allSentences.end(), 
          [](const sentence& lhs, const sentence & rhs) {
                     return lhs.words[0] < rhs.words[0];}
         );

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