C++ cin >> "没有运算符匹配这些操作数"
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cin >> "no operator matches these operands"
提问by user3163612
I've been working on a C++ project in visual studio 2012 console mode and I keep getting this strange persistent error with the cinfunction.
我一直在 Visual Studio 2012 控制台模式下处理一个 C++ 项目，并且我一直在使用该cin函数遇到这个奇怪的持续错误。
Under the >>I get a red line and the program tells me no operator matches these operands.
I have initialized all the array elements in a separate method.
在>>I 下有一条红线，程序告诉我no operator matches these operands。我已经在一个单独的方法中初始化了所有的数组元素。
Here's a snippet example (The actual code contains many more variables):
这是一个片段示例（实际代码包含更多变量）：
for (int i = 0; i < 14; i++)
{
cout << "For taxi: " << i+1 << "Please input the taxi rank they are currently parked at, if at all ('Train Station', 'South Walls' or 'Chell Road')" << endl;
cin >> allTaxiDetails[i].taxiRank;
}
allTaxiDetailsis an array, of data type "taxiDetails" which is this structure:
allTaxiDetails是一个数组，数据类型为“ taxiDetails”，它是这个结构：
struct taxiDetails {
string taxiDriverSurname;
int taxiID;
int taxiCoordinates;
int numberOfSeats;
bool taxiContainsCustomerYesNo;
bool WheelChairAccessibleVehicle;
string taxiRank;
fareDetails fareDetailsForTaxi;
bool taxiAvaliable;
};
回答by Keeler
Issue is saying that stringdoesn't have the operator>>method, but it does...
问题是说string没有operator>>方法，但它确实......
- Did you forget
#include <string>at the top of that file? - Maybe try using
getline(std::cin, allTaxiDetails[I].taxiRank, '\n');. - Define
operator>>for your struct.
- 你忘记
#include <string>在那个文件的顶部了吗？ - 也许尝试使用
getline(std::cin, allTaxiDetails[I].taxiRank, '\n');. operator>>为您的结构定义。
回答by Dietmar Kühl
It seems you are trying to read an object of type std::stringfor which you somehow obtained the class definition (e.g. by including <iostream>) but you didn't get all the necessary operations! Make sure you are including <string>:
似乎您正在尝试读取一个类型的对象std::string，您以某种方式获得了类定义（例如，通过包含<iostream>），但您没有获得所有必要的操作！确保您包括<string>：
#include <string>
// ...
It is quite common that some headers provide definitions of some other classes but actually don't use the entire header to get the definitions. Since std::stringis in some places needed to declare IOStreams it is fairly likely that it will be defined but probably not by including its full header.
一些头文件提供了一些其他类的定义，但实际上并不使用整个头文件来获取定义，这是很常见的。由于std::string在某些地方需要声明 IOStreams，因此很可能会定义它，但可能不会通过包含其完整标头来定义。
回答by WayneX
I believe forget #include < string >this critical header is the error source. It happened to me as a beginner of C++.
我相信忘记 #include <string>这个关键的头是错误源。作为 C++ 的初学者，它发生在我身上。
