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sync: get the size of sync.Map #20921

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AlexStocks opened this issue Jul 6, 2017 · 2 comments
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sync: get the size of sync.Map #20921

AlexStocks opened this issue Jul 6, 2017 · 2 comments
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@AlexStocks
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AlexStocks commented Jul 6, 2017 •
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What version of Go are you using (go version)?

go 1.9 beta2

What did you expect to see?

If use map, I can get the size of it by len(map). Whatever, how can I get the size of sync.Map?

What did you see instead?

Add function: func (m *Map) Len() int

Maybe Map should have a member "size int64". Map can change its value in Store & LoadOrStore & Delete by using atomic.AddInt64. And then (m Map) Len() can return m.size to get Map's size.
@ALTree
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ALTree commented Jul 6, 2017

Thanks for the report.

This is an exact duplicate of #20680 (sync: add Map.Len method?), so I'm closing this thread in favour of the older one.

@ALTree ALTree closed this as completed Jul 6, 2017
@AlexStocks
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okay

@mikioh mikioh changed the title get the size of sync.Map sync: get the size of sync.Map Jul 10, 2017
@golang golang locked and limited conversation to collaborators Jul 10, 2018
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@ALTree @AlexStocks @gopherbot