C++函数参数作为参考
我有一个问题。谁能告诉我为什么有人会这样声明参数r？
Record 和 Record 有什么区别？ r 和记录(&r) ？
QDataStream& operator>>(QDataStream &s, Record(&r))
{
}
谢谢 ：）
I have a question. Can anyone tell me why someone would declare parameter r like that ?
Whats the difference between Record& r and Record(&r) ?
QDataStream& operator>>(QDataStream &s, Record(&r))
{
}
Thanks :)
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Record(&r)和Record &r是相同的类型声明。我不知道为什么有人会包含括号，除非出于风格原因。也许这是重构留下的一些残渣？Record(&r)andRecord &rare identical type declarations. I don't know why somebody would include the parentheses except for stylistic reasons. Perhaps it's some cruft left over from a refactoring?正如理查德所说，Record (&r) 和 Record &r 是等价的。因此，重要的区别在于它们如何有效地传达程序员的意图。我个人更喜欢Record& r 优于 Record &r 因为我喜欢将类型与名称分开。也就是说，我会避免使用 Record (&r)，因为它看起来与函数类型的语法非常相似。例如，Record (&r)() 会将 r 声明为对如下函数的引用。
As Richard said Record (&r) and Record &r are equivalent. So the important difference is how effectively they communicate the intent of programmer. I personally prefer Record& r over Record &r because I like to separate the type from the name. That said, I would avoid the Record (&r) because it looks so similar to the syntax for function types. For example, Record (&r)() would declare r as a reference to a function such as the following.