Thanks for the clear explanation! 在 2017年5月1日星期一 UTC+8下午9:55:30，Ian Lance Taylor写道： > > On Mon, May 1, 2017 at 6:03 AM, feilengcui008 <feilen...@gmail.com > <javascript:>> wrote: > > > > I have made a little testing about interface assignment and searched > the > > source code about interface runtime functions like convI2I, and notice > that > > there are two situations where data may be copied or not: > > (1) data not copied: assign another interface type variable to the > > targeted interface variable > > (2) data copied and memory allocated: assign another not interface > type > > variable to the targeted interface variable > > > > I wonder are there any special reasons for that? > > Thanks in advance! following is my simple testing code and debug > info > > Interfaces hold values that must not change while they are in the > interface. When assigning from one interface value to another, it's > fine to simply copy the pointer, as we already know that the value > can't change. When assigning in or out of an interface value, in > general we need to copy the value so that any changes to the value > (such as changing a field in a struct) do not affect the value in the > interface. > > Ian >
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