握手，c++11还有个brace initializer
【 在 ble 的大作中提到: 】
: C++11: auto, lambda, range-for, smart pointers, &&, string literal, <chrono> <tuple>
: C++14: make_unique
: C++17: <any> <optional> <variant> <string_view> <execution> <filesystem>
: ...................
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