From 92024078af0563d82641814ce82d1ce408225d84 Mon Sep 17 00:00:00 2001
From: Flier Lu <flier.lu@gmail.com>
Date: Fri, 19 Mar 2021 18:17:25 +0800
Subject: [PATCH] add `FilterPolicy.Destroy`, #132

---
 filter_policy.go      | 4 ++++
 filter_policy_test.go | 1 +
 2 files changed, 5 insertions(+)

diff --git a/filter_policy.go b/filter_policy.go
index a9c222b0..2034238c 100644
--- a/filter_policy.go
+++ b/filter_policy.go
@@ -19,6 +19,9 @@ type FilterPolicy interface {
 
 	// Return the name of this policy.
 	Name() string
+
+	// Destroy deallocates the policy filter.
+	Destroy()
 }
 
 // NewNativeFilterPolicy creates a FilterPolicy object.
@@ -33,6 +36,7 @@ type nativeFilterPolicy struct {
 func (fp nativeFilterPolicy) CreateFilter(keys [][]byte) []byte          { return nil }
 func (fp nativeFilterPolicy) KeyMayMatch(key []byte, filter []byte) bool { return false }
 func (fp nativeFilterPolicy) Name() string                               { return "" }
+func (fp nativeFilterPolicy) Destroy()                                   { C.rocksdb_filterpolicy_destroy(fp.c) }
 
 // NewBloomFilter returns a new filter policy that uses a bloom filter with approximately
 // the specified number of bits per key.  A good value for bits_per_key
diff --git a/filter_policy_test.go b/filter_policy_test.go
index c15aa1b6..d7e0a151 100644
--- a/filter_policy_test.go
+++ b/filter_policy_test.go
@@ -74,3 +74,4 @@ func (m *mockFilterPolicy) CreateFilter(keys [][]byte) []byte {
 func (m *mockFilterPolicy) KeyMayMatch(key, filter []byte) bool {
 	return m.keyMayMatch(key, filter)
 }
+func (m *mockFilterPolicy) Destroy() {}