只有两个成员的 std::pair 和 std::tuple 之间的区别?
std::pair 和只有两个成员的 std::tuple 之间有区别吗?(除了明显的 std::pair 需要两个且只有两个成员并且 tuple 可能有更多或更少......)
Is there a difference between an std::pair and an std::tuple with only two members? (Besides the obvious that std::pair requires two and only two members and tuple may have more or less...)
推荐答案
有一些区别:
std::tuple标准并不要求永远是 standard-layout.如果T和Y都是标准布局，则每个std::pair都是标准布局.
std::tupleis not required by the standard to ever be standard-layout. Everystd::pair<T, Y>is standard-layout if bothTandYare standard-layout.
获取 pair 的内容比获取 tuple 的内容要容易一些.您必须在 tuple 情况下使用函数调用，而 pair 情况只是一个成员字段.
It's a bit easier to get the contents of a pair than a tuple. You have to use a function call in the tuple case, while the pair case is just a member field.
但仅此而已.
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