fdf882ded2
Summary: When dynamically linking two binaries together, different builds of RocksDB from two sources might cause errors. To provide a tool for user to solve the problem, the RocksDB namespace is changed to a flag which can be overridden in build time. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6433 Test Plan: Build release, all and jtest. Try to build with ROCKSDB_NAMESPACE with another flag. Differential Revision: D19977691 fbshipit-source-id: aa7f2d0972e1c31d75339ac48478f34f6cfcfb3e
26 lines
864 B
C++
26 lines
864 B
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <unordered_map>
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namespace ROCKSDB_NAMESPACE {
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// Helper methods to estimate memroy usage by std containers.
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template <class Key, class Value, class Hash>
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size_t ApproximateMemoryUsage(
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const std::unordered_map<Key, Value, Hash>& umap) {
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typedef std::unordered_map<Key, Value, Hash> Map;
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return sizeof(umap) +
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// Size of all items plus a next pointer for each item.
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(sizeof(typename Map::value_type) + sizeof(void*)) * umap.size() +
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// Size of hash buckets.
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umap.bucket_count() * sizeof(void*);
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}
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} // namespace ROCKSDB_NAMESPACE
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