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出现was not declared in this scope这个错误的真正原因!

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出现was not declared in this scope这个错误的真正原因!
出现was not declared in this scope这个错误的真正原因是什么呢?
能不能举个简单的例子,好几次碰到这个错误,都是糊里糊涂的解决的.
比如：我的函数原型是这样的(在一个cpp文件中)：
Qt3RegExp::Qt3RegExp( const Qt3RegExp& rx )
:eng( 0 )
{
priv = new Qt3RegExpPrivate;
operator=( rx );
}
而出错的地方是(另一个cpp文件)：
Qt3RegExp regexp("^(X-)?(CP|IBM)(-| (0-9)+");
出错的提示是：
'Qt3RegExp' was not declared in this scope
如何改呢?
出现was not declared in this scope这个错误的真正原因!
就是标识符没有声明.后面那个in this scope是画蛇添足的话.
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