std :: getline（）返回 [英] std::getline() returns
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问题描述
我有一个循环，使用getline（）读取文件中的每一行。
I have a loop that reads each line in a file using getline().
istream is;
string line;
while (!getline(is, line).eof())
{
}
我注意到这样调用getline（）似乎也工作：
I noticed that calling getline() like this also seems to work:
while (getline(is, line))
这是怎么回事？ getline（）返回流引用。是不是被转换为指针？
What's going on here? getline() returns a stream reference. Is it being converted to a pointer somehow? Is this actually a good practice or should I stick to the first form?
推荐答案
getline（）返回的istream有它的operator void *（）方法隐式调用，它返回流是否遇到错误。因此，它比调用eof（）进行更多的检查。
The istream returned by getline() is having its operator void*() method implicitly called, which returns whether the stream has run into an error. As such it's making more checks than a call to eof().
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