Question

我正在尝试使用Accelerated C ++的示例5.1，其中我应该创建一个置换索引。因此，我试图将每个轮换（在我首先使用cout语句测试时将其变为正常轮廓）放入其自身的向量中。

#include <cctype>
#include <iostream>
#include <string>
#include <vector>

#include "split.h"


using namespace std;


void rotate(vector<string> lineSplit){

    // create vector of vectors, length is the amount
    // of words. Each vector will contain a rotation
//    std::vector<string> rotations(lineSplit.size(), "");
    std::vector<string> rotations(lineSplit.size(), "");

    for (int i=0; i<lineSplit.size(); i++){
        cout << "New Rotation: " << endl;

        for (int j=i; j<lineSplit.size(); j++){
            rotations[i].push_back(lineSplit[j]);
            cout << lineSplit[j] << endl;
        }
        // cout << "START IN HERE!" << endl;
            for (int j=0; j<i; j++){
                rotations[i].push_back(lineSplit[j]);
                cout << lineSplit[j] << endl;
            }
    }
}

int main()
{

    string line="The quick brown fox";
    vector<string> lineSplit = split(line);

    cout << "size of lineSplit is: " << lineSplit.size() << endl;

    rotate(lineSplit);

}

所以旋转应该是向量的向量，每个向量都包含一个旋转（根据注释语句）我认为我可以用“rotations [i] .push_back（lineSplit [j]）添加到每个单独的向量“但是编译器抱怨道：

main.cpp: In function ‘void rotate(std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >)’:
main.cpp:23: error: no matching function for call to ‘std::basic_string<char, std::char_traits<char>, std::allocator<char> >::push_back(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)’
/usr/include/c++/4.2.1/bits/basic_string.h:869: note: candidates are: void std::basic_string<_CharT, _Traits, _Alloc>::push_back(_CharT) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]
main.cpp:28: error: no matching function for call to ‘std::basic_string<char, std::char_traits<char>, std::allocator<char> >::push_back(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)’
/usr/include/c++/4.2.1/bits/basic_string.h:869: note: candidates are: void std::basic_string<_CharT, _Traits, _Alloc>::push_back(_CharT) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]

我是否错误地初始化了旋转？

Answer 1

 rotations[i].push_back(lineSplit[j]);

rotations是字符串的向量，因此rotations[i]是字符串。 lineSplit是字符串的向量，因此lineString[i]是字符串。您push_back只能在字符串中使用字符，而不能在字符串中使用字符串。看起来，rotations应该有vector<vector<string> >类型。

填充向量向量时出错：没有匹配函数来调用std :: basic_string :: push_back

1 个答案: