错误：“ string_view”不是“ std”的成员 [英] error: 'string_view' is not a member of 'std'

问题描述

我是C ++的新手。我在Windows10的visual-studio-code中编译了我的代码，带有2个类型为string和string_view的变量。字符串变量很好，但是string_view给出了错误。我还启用了configuration.json中的c ++ 17扩展并在vscode中编辑了configuration / ui文件。

i am new to c++. i compiled my code in visual-studio-code in windows10, with 2 variables of type string and string_view. string variable is fine, but string_view is giving errors.I also enable c++17 extension in configuration.json and edit configuration/ui file in vscode.

这是我的代码：=

#include<iostream>
#include<string_view>
using namespace std;
int main(){
      string str="hello";
      cout<<str<<endl;
      std::string_view sv=" world";
      auto result=str+sv.data();

      return 0;
}

错误是：=

main.cpp: In function 'int main()':
main.cpp:7:12: error: 'string_view' is not a member of 'std'
       std::string_view sv=" world";
            ^~~~~~~~~~~
main.cpp:7:12: note: 'std::string_view' is only available from C++17 onwards
main.cpp:8:23: error: 'sv' was not declared in this scope
       auto result=str+sv.data();
                       ^~

推荐答案

我找不到您代码中的任何错误。我在此处编译了代码（在此处复制代码并在编译之前选择语言C ++ 17），正在按预期工作。只需检查您正在运行的编译器是否支持C ++ 17功能即可。因为std :: string_view仅从C ++ 17起可用。
以便在Visual Studio中启用C ++ 17 在此处检查并在Visual Studio代码中遵循此。

I didn't find any bug in your code. I compiled your code here (Copy your code there and select the language C++17 before compiling) and it is working as expected. Just check the compiler which you are running supports C++17 features. Because std::string_view is only available from C++17 onwards. To enable C++17 in Visual studio check here and in Visual studio code follow this .

希望这样做将为您提供帮助。

Hope this will help you.

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