dongshou1856 2017-12-03 20:21
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Golang接口所需的空间

How much space (in bytes) does a Golang interface take up?

For example, which would take up more space?

type Stringer interface { String() string }

strSlice := make([]string, 4)
stringerSlice := make([]Stringer, 4)
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  • dongque6377 2017-12-03 22:36
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    • interface consumes 2 words of memory: 1 word for runtime type and 1 word for data pointer;
    • string consumes 2 words of memory: 1 word for base pointer and 1 word for length;
    • slice consumes 3 words of memory: 1 word for base pointer, 1 word for length and 1 word for capacity;
    • function, channel and map consume 1 word.

    Based on the machine type(32bit or 64bit) word size is 4 bytes length or 8 bytes length respectively.

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