chrisyunhua

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1 day ago

Replied to a topic by lynan › 旅行 › 最近又去了一次新疆（北疆）旅行，分享游记

拍的好好看，博客也好看，还能切换 HDR ，赞！

Aug 9, 2025

Replied to a topic by Lin0936 › Apple › Apple 账号登录系统挂了？

还是登不了。
Unexpected response from IDMS server

Aug 6, 2024

Replied to a topic by Betsy › C++ › 求教个神奇的 C++ 打印问题

去掉 & 改为 `const ReducedGroupId id = ...` 也可以。

@Betsy 不用 optional 没问题，我的理解是：因为 GetReducedGroupId() 属于 prvalue ，赋给 const & 时触发了 lifetime extension ；而 optional.value() 返回类型是 const & 属于 lvalue ，不触发 lifetime extension 。

https://en.cppreference.com/w/cpp/language/lifetime

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