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C++20 前不允许使用 `()` 初始化聚合体。 | ||
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1. `std::move()` 个 jb 啊,不 move 也能复制消除,move 还可能影响优化。 | ||
2. 有问题,悬垂引用。 | ||
3. 没有问题,类数据成员不是隐式可移动实体,需要通过 `std::move` 让重载决议选择移动构造。 | ||
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