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container/heap: avoid memory leak in example 

Set element in slice to nil avoiding memory leak.

Change-Id: I9dbef9a0466407011e326725d3a0b681cd815389
GitHub-Last-Rev: 1bae5d3758
GitHub-Pull-Request: golang/go#30386
Reviewed-on: https://go-review.googlesource.com/c/163601
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
WhisperRain 2019-02-26 23:01:53 +00:00 committed by Ian Lance Taylor
parent e609bd373f
commit 7a9968f96f
1 changed files with 1 additions and 0 deletions
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src/container/heap/example_pq_test.go
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@ -45,6 +45,7 @@ func (pq *PriorityQueue) Pop() interface{} {
old := *pq old := *pq
n := len(old) n := len(old)
item := old[n-1] item := old[n-1]
old[n-1] = nil // avoid memory leak
item.index = -1 // for safety item.index = -1 // for safety
*pq = old[0 : n-1] *pq = old[0 : n-1]
return item return item