为什么我得到"从'vector <Country>'到'int'没有可行的转换"？

Question

我真的不确定为什么我收到这个错误.我试图谷歌它,但我没有得到最好的结果...如果有人可以告诉我为什么我得到这个错误:

No viable conversion from 'vector<Country>' to 'int'

int main()
{
    vector<Country> readCountryInfo(const string& filename);

    // Creating empty vector
    vector<Country> myVector;

    // Opening file
    ifstream in;
    in.open("worldpop.txt");

    if (in.fail()) {
        throw invalid_argument("invalid file name");
    }

    while (in) {

        char buffer; // Character buffer
        int num; // Integer to hold population
        string countryName; // Add character buffer to create name

        while (in.get(buffer)) {

            // Check if buffer is a digit
            if (isdigit(buffer)) {
                in.unget();
                in >> num;
            }

            // Check if buffer is an alphabetical character
            else if (isalpha(buffer) || (buffer == ' ' && isalpha(in.peek()))) {
                countryName += buffer;
            }

            // Checking for punctuation to print
            else if (ispunct(buffer)) {
                countryName += buffer;
            }

            // Check for new line or end of file
            else if (buffer == '\n' || in.eof()) {
                // Break so it doesn't grab next char from inFile when running loop
                break;
            }

        }

        Country newCountry = {countryName, num};
        myVector.push_back(newCountry);

    }

    return myVector;

}

Answer 1

它在这里说

int main()

即main返回int-因为它应该,因为标准要求它.

然后,最后,你说

return myVector;

并且myVector是一个vector<Country>,不能转换为int.
因此错误消息.

我怀疑,根据声明

vector<Country> readCountryInfo(const string& filename);

的一个函数确实返回vector<Country>,你打算写你的代码在一个名为"readCountryInfo"的功能,但不知何故发生把它写在错误的地方.