c++ - fstream文件读取失败

Question

我想传递一个 fstream 对象并对单词进行标记。它总是打印 could not open file in hasNextToken() 。有人可以帮助我吗。

// main.cpp

int main() {
    string filename = "input.txt";
    fstream inputStream(filename);
    Tokenizer t(inputStream);
    while (t.hasNextToken()) {
    cout << t.nextToken();
 }
}

//分词器.h

class Tokenizer {
    fstream fin;

public:
    Tokenizer(fstream& file)
    {
        fin << file;
    }

    bool hasNextToken() {
        if (!fin) {
            cout << "Could not open file: " << endl;
            exit(0);
        }
        return true;
    }

    string nextToken() {
        string line;
        getline(fin, line);
        if (fin) {
            istringstream sin(line);
            string word;
            sin >> word;
            return word;

        }
    }
};

Answer 1

试试这个:

class Tokenizer {
    fstream& fin;

public:
    Tokenizer(fstream& file)
    : fin(file)
    {}

...
}