be/src/kudu/util/memcmpable_varint.h

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
//
// This is an alternate varint format, borrowed from sqlite4, that differs from the
// varint in util/coding.h in that its serialized form can be compared with memcmp(),
// yielding the same result as comparing the original integers.
//
// The serialized form also has the property that multiple such varints can be strung
// together to form a composite key, which itself is memcmpable.
//
// See memcmpable_varint.cc for further description.

#ifndef KUDU_UTIL_MEMCMPABLE_VARINT_H
#define KUDU_UTIL_MEMCMPABLE_VARINT_H

#include <cstdint>

namespace kudu {

class Slice;
class faststring;

void PutMemcmpableVarint64(faststring *dst, uint64_t value);

// Standard Get... routines parse a value from the beginning of a Slice
// and advance the slice past the parsed value.
bool GetMemcmpableVarint64(Slice *input, uint64_t *value);

} // namespace kudu

#endif