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如何在C++中清除cin缓冲区？

我正在尝试使用getline读取一串文本.出于某种原因,它会打印两次"请输入您的选择":

Please enter your selection
Please enter your selection

如果我键入无效文本,它会再次循环,并且此后每次循环只打印一次.

while (valid == false) {    
    cout << "Please enter your selection" << endl;
    getline (cin,selection);

    // I have a function here which checks if the string is valid and sets it to true 
    // if it is valid.  This function works fine, so I have not included it here.  The while
    // look breaks correctly if the user enters valid input.
}

有没有人知道为什么会这样？

谢谢