| // Copyright 2013 Cloudera, Inc. |
| // |
| // Licensed 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 "kudu/util/faststring.h" |
| #include "kudu/util/slice.h" |
| |
| namespace kudu { |
| |
| 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 |
