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by yencabulator
2125 days ago
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[]int{} is a non-nil slice, which allocates. The zero-length optimization probably doesn't exist for arrays in this context, because no sane code does this. This still has nothing to do with "declaring" vs "initializing" (Go makes no such distinction; all values are always "initialized"), or direct use of arrays. |
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This is no distinction for arrays for non-array. E.g. [0]int is a valid type, and it's size is zero. It is treated exactly the same as all other zero-sized types. This is not a special optimization: there are may cases of zero-sized types.
The slice itself is a value type. So foo := []int{} would occupy 24-bytes (data pointer, len, cap) and not necessarily escape to the heap, exactly the same as var foo []string.