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https://bot-man-jl.github.io/articles/?post=2019/Inside-Cpp-Callback&nsukey=9DWU5Y9C6P3/cVW4nfNvhhv3FCplkJg1yaYppOEm6jLufNzs2aoGJLJFrRn7ugSvz+sHwe5g/z7kvZ1fgLtWM+bCYbGFNv9VguTILyelqKpndbOGFoDiyVaQDd+9cdrPL1hjkA5ga45ufQwOyO9TaAWGjh8GAYpi15swzAxCDsN/1IjuSVTYTaLwxahIsBUgK7HPtNbtdpe/BdkhOGBjxg==#何时销毁-强引用-上下文