tomFlowee
c63519fa47
The leveldb and univalue 3rd party libraries are not installed and not needed by anyone outside of the Hub. So move them there, making it easier for 3rd party usage.
68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "leveldb/iterator.h"
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namespace leveldb {
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Iterator::Iterator() {
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cleanup_.function = NULL;
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cleanup_.next = NULL;
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}
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Iterator::~Iterator() {
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if (cleanup_.function != NULL) {
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(*cleanup_.function)(cleanup_.arg1, cleanup_.arg2);
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for (Cleanup* c = cleanup_.next; c != NULL; ) {
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(*c->function)(c->arg1, c->arg2);
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Cleanup* next = c->next;
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delete c;
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c = next;
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}
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}
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}
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void Iterator::RegisterCleanup(CleanupFunction func, void* arg1, void* arg2) {
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assert(func != NULL);
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Cleanup* c;
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if (cleanup_.function == NULL) {
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c = &cleanup_;
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} else {
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c = new Cleanup;
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c->next = cleanup_.next;
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cleanup_.next = c;
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}
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c->function = func;
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c->arg1 = arg1;
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c->arg2 = arg2;
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}
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namespace {
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class EmptyIterator : public Iterator {
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public:
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EmptyIterator(const Status& s) : status_(s) { }
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virtual bool Valid() const { return false; }
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virtual void Seek(const Slice& target) { }
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virtual void SeekToFirst() { }
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virtual void SeekToLast() { }
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virtual void Next() { assert(false); }
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virtual void Prev() { assert(false); }
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Slice key() const { assert(false); return Slice(); }
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Slice value() const { assert(false); return Slice(); }
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virtual Status status() const { return status_; }
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private:
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Status status_;
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};
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} // namespace
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Iterator* NewEmptyIterator() {
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return new EmptyIterator(Status::OK());
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}
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Iterator* NewErrorIterator(const Status& status) {
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return new EmptyIterator(status);
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}
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} // namespace leveldb
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