没有匹配的构造函数初始化'值类型' [英] No matching constructor for initialisation of 'value type'

问题描述

我有一些代码，获取最常见的单词，并将它们放入一个向量。然后我将向量按数字顺序排序，这一切都很好。然后我尝试将向量调整为10，所以我可以得到前十个，我想通过词排序。

I have got some code that gets the most frequent words and puts them into a vector. I then sort the vector into numerical order and all this works fine. I then try to resize the vector to 10 so I can get the top ten that I want to sort by word.

我认为问题在于我的结构的一部分，我不确定这里是我使用的代码。

I think the problem lies with part of my struct but i am not to sure here is the code i am using.

struct wordFreq
{
    string word;
    int count;

    wordFreq(string str, int c): word(str),count(c) { }
}; 

words.resize(10);

任何帮助将不胜感激。

Any help will be appreciated.

推荐答案

调整向量大小时，函数 resize 需要知道新元素的值。因此，调用

When resizing the vector, the function resize needs to know the value for the new elements. Therefore, the call

words.resize(10);

包含 wordFreq（），在您的情况下是无效的，因为 wordFreq 类没有默认构造函数。

includes a default argument of the form wordFreq(), which is invalid in your case, since the class wordFreq doesn't have a default constructor.

如果没有创建新元素，请使用 erase 而不是 resize 。

If no new elements are being created, use erase instead of resize.

words.erase(words.begin() + 10, words.end());

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