[英]error: no match for ‘operator<<’ (operand types are ‘std::ostream {aka std::basic_ostream<char>}’ and ‘void’)
這是我的代碼（我只寫了本質），我得到了這個：
錯誤：“operator<<”不匹配（操作數類型是“std::ostream {aka std::basic_ostream}”和“void”）
class Mobil {
public:
void print() const;
int getNumber() const;
double getData() const;
friend ostream& operator <<(ostream&, const Mobil&);
};
ostream& operator<<(ostream& out, const Mobil& mobil) {
out << mobil.print() << endl;
return out;
}
問題是什么？
問題是這一行： out << mobil.print() << endl; . 您的print()方法不返回任何內容（是void類型），因此無法將其發送到ostream 。
為了解決這個問題，您的print()方法應該以ostream支持的一種類型返回您想要打印的任何內容，您可以在參考中找到。
如何修復錯誤：'operator<<' 不匹配（操作數類型為 'std::ostream {aka std::basic_ostream<char> }' 和 'void'）同時使用字符串和堆棧</char>
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