| // 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 |