'operator>>'的模棱两可的过载

Ambiguous overload for 'operator>>'

本文关键字：gt 模棱两可 operator      更新时间：2023-10-16

这是我得到的错误：

ambiguous overload for ‘operator>>’ in ‘contestantsInputFile >> contestantName’|

我正在尝试通过引用将文件传递给函数，以便将名称读取到名为 contestantName 的变量中。

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
string contestantName = "";
string contestantName(ifstream &);
int main()
{
    ifstream contestantsInputFile;
    contestantsInputFile.open("contestants_file.txt");    
    contestantName(contestantsInputFile);
}

string contestantName(ifstream &contestantsInputFile)
{
    contestantsInputFile >> contestantName; //this is the line with the error
    return contestantName;
}

您尝试从 std：：istream 读取函数：

contestantsInputFile >> contestantName; //this is the line with the error

也许这更多是你的意图（未经测试）：

#include <iostream>
#include <fstream>
#include <string>
using namespace std;
string readContestantName(ifstream &); // renamed to be a descriptive verb
int main()
{
    ifstream contestantsInputFile;
    contestantsInputFile.open("contestants_file.txt");    
    std::string contestantName = readContestantName(contestantsInputFile);
    std::cout << "contestant: " << contestantName << "n";
}

string readContestantName(ifstream &contestantsInputFile)
{
    std::string contestantName; // new variable
    contestantsInputFile >> contestantName; //this is the line with the error
    return contestantName;
}
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