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proposal: sync: add Map.LoadOrStoreFunc method #67048

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callthingsoff opened this issue Apr 26, 2024 · 3 comments
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proposal: sync: add Map.LoadOrStoreFunc method #67048

callthingsoff opened this issue Apr 26, 2024 · 3 comments
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@callthingsoff
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Proposal Details

I propose adding Map.LoadOrStoreFunc method:

// LoadOrStoreFunc is like LoadOrStore, but receives a function to provide the value.
func (m *Map) LoadOrStoreFunc(key any, valueFunc func() any) (actual any, loaded bool)

Sometimes I don’t immediately know the value to store, and it’s a heavy operation to get the value, I’d like use LoadOrStoreFunc to compute the value lazily. Maybe it’s worth adding this method.
@gopherbot gopherbot added this to the Proposal milestone Apr 26, 2024
@jfrech
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jfrech commented Apr 26, 2024

Is valueFunc disallowed from accessing m?

@AlexanderYastrebov
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See also previous discussion #44159

@callthingsoff
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Thanks.

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@AlexanderYastrebov @callthingsoff @gopherbot @jfrech