list.push_back（）不工作：引发错误C＆＃x2B;＆＃x2B;

发布于 2025-01-18 19:31:39 字数 682 浏览 2 评论 0原文

#include <iostream>
#include <list>

using namespace std;

string song = "CDE";
int songlength = song.length();
int counter = 0;

int main() {
    cout << songlength << endl;
    for (int i = 0; i < songlength + 1; i++, counter++) {
        list<string> songlist;
        songlist.push_back(song[counter]);
        if (counter <= songlength) {
        }
    }
}

我是初学者，对这种编程语言了解不多。

错误：

error: no matching function for call to 'std::__cxx11::list<std::__cxx11::basic_string<char> >::push_back(__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type&)'

原文

#include <iostream>
#include <list>

using namespace std;

string song = "CDE";
int songlength = song.length();
int counter = 0;

int main() {
    cout << songlength << endl;
    for (int i = 0; i < songlength + 1; i++, counter++) {
        list<string> songlist;
        songlist.push_back(song[counter]);
        if (counter <= songlength) {
        }
    }
}

I am a beginner and I do not know much about this programming language.

Error:

error: no matching function for call to 'std::__cxx11::list<std::__cxx11::basic_string<char> >::push_back(__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type&)'

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云淡月浅 2025-01-25 19:31:39

类std :: String没有具有类型char的第一个参数的构造函数。

您要么需要声明列表，要么

std::list<char> songlist;

像这样，

std::list<std::string> songlist;

但在最后一个情况下，您需要调用方法push_back喜欢

songlist.push_back(std::string( 1, song[counter] ) );

使用构造函数

basic_string(size_type n, charT c, const Allocator& a = Allocator());

，也需要在for循环之前将列表的声明放置。否则，在循环中，列表将在循环的每次迭代中重新创建。

例如

std::list<char> songlist;
for ( std::string::size_type i = 0; i < songlength; i++ ) {
    songlist.push_back(song[i]);
}

for ( char c : songlist )
{
    std::cout << c;
}
std::cout << '\n';

The class std::string does not have a constructor with the first parameter of the type char.

Either you need to declare the list like

std::list<char> songlist;

or like

std::list<std::string> songlist;

But in the last case you need to call the method push_back like

songlist.push_back(std::string( 1, song[counter] ) );

using the constructor

basic_string(size_type n, charT c, const Allocator& a = Allocator());

Also you need to place the declaration of the list before the for loop. Otherwise within the loop the list is created anew in each iteration of the loop.

For example

std::list<char> songlist;
for ( std::string::size_type i = 0; i < songlength; i++ ) {
    songlist.push_back(song[i]);
}

for ( char c : songlist )
{
    std::cout << c;
}
std::cout << '\n';

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