C++ non-aggregate cannot be initialized

原创已于 2023-04-27 10:17:42 修改 · 410 阅读

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#c++ #开发语言 #c语言

于 2023-04-25 17:28:49 首次发布

文章描述了一段C++代码在尝试用初始化列表初始化vector时遇到的错误。问题在于编译器未启用C++11标准，导致无法识别这种语法。解决方案是使用g++编译器时添加标志`-std=c++11`，以启用C++11标准支持。

问题复现

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

using  namespace std;

int main()
{
    vector<string> msg = {"Hello", "C++", "World", "from", "VS Code", "and the C++ extension!"};

    for (const string& word : msg)
    {
        cout << word << " ";
    }
    cout << endl;
}

运行代码结果

g++ hello.cpp -o  hello 
hello.cpp:9:20: error: non-aggregate type 'vector<std::string>' (aka 'vector<basic_string<char, char_traits<char>, allocator<char> > >') cannot be initialized with an initializer list
    vector<string> msg = {"Hello", "C++", "World", "from", "VS Code", "and the C++ extension!"};
                   ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hello.cpp:11:29: warning: range-based for loop is a C++11 extension [-Wc++11-extensions]
    for (const string& word : msg)