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misc/cgo: remove reference to 'destroy' function
R=golang-dev, gri CC=golang-dev https://golang.org/cl/4558042
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@ -86,9 +86,8 @@ explicitly in Go to pointers to arrays, as they do (implicitly) in C.
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Garbage collection is the big problem. It is fine for the Go world to
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have pointers into the C world and to free those pointers when they
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are no longer needed. To help, the garbage collector calls an
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object's destroy() method prior to collecting it. C pointers can be
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wrapped by Go objects with appropriate destroy methods.
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are no longer needed. To help, the Go code can define Go objects
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holding the C pointers and use runtime.SetFinalizer on those Go objects.
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It is much more difficult for the C world to have pointers into the Go
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world, because the Go garbage collector is unaware of the memory
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