On Fri, Mar 3, 2017 at 5:31 AM, T L <tapir....@gmail.com> wrote:
>
> On Friday, March 3, 2017 at 7:52:42 PM UTC+8, Ian Davis wrote:
>>
>> Perhaps you can help the discussion by explaining the advantages you see
>> in that change?
>
>
> The advantage is to save a few bytes memory and make faster copying.
I don't see how the suggestion saves memory. Currently, we can
represent a string or slice with a single allocation. Your suggestion
would require us to use two allocations: one for the bytes, and one
for the structure pointing to the bytes. In some cases escape
analysis would eliminate that second allocation, but not in all.
Ian
>> On Fri, 3 Mar 2017, at 11:44 AM, T L wrote:
>>
>>
>>
>> On Friday, March 3, 2017 at 4:27:02 PM UTC+8, Konstantin Khomoutov wrote:
>>
>> On Thu, 2 Mar 2017 23:49:52 -0800 (PST)
>> T L <tapi...@gmail.com> wrote:
>>
>> > After all, the len and cap fields of any value of string and slice
>> > values are immutable.
>>
>> Could you elaborate?
>>
>> Are you suggesting to replace
>>
>> var s []string
>>
>> if len(s) ...
>> if cap(s) ...
>>
>> with
>>
>> if s.len ...
>> if s.cap ...
>>
>> ?
>>
>> If yes, then what would be the prospective benefits?
>>
>>
>>
>> No, I mean why not define string and slice as
>>
>> type string struct {
>> underlyingString *struct {
>> data *byte
>> len int
>> }
>> }
>>
>> type slice struct {
>> underlyingSlice *struct {
>> underlyingElements unsafe.Pointer
>> len int
>> cap int
>> }
>> }
>> instead of the current:
>>
>> type string struct {
>> data *byte
>> len int
>> }
>>
>> type slice struct {
>> underlyingElements unsafe.Pointer
>> len int
>> cap int
>> }
>>
>>
>>
>>
>>
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