/usr/include/mongo/bson/ordering.h is in libmongoclient-dev 1.1.2-6ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | // ordering.h
/* Copyright 2009 10gen 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.
*/
#pragma once
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjiterator.h"
namespace mongo {
// todo: ideally move to db/ instead of bson/, but elim any dependencies first
/** A precomputation of a BSON index or sort key pattern. That is something like:
{ a : 1, b : -1 }
The constructor is private to make conversion more explicit so we notice where we call make().
Over time we should push this up higher and higher.
*/
class Ordering {
unsigned bits;
Ordering(unsigned b) : bits(b) {}
public:
Ordering(const Ordering& r) : bits(r.bits) {}
void operator=(const Ordering& r) {
bits = r.bits;
}
/** so, for key pattern { a : 1, b : -1 }
get(0) == 1
get(1) == -1
*/
int get(int i) const {
return ((1 << i) & bits) ? -1 : 1;
}
// for woCompare...
unsigned descending(unsigned mask) const {
return bits & mask;
}
/*operator std::string() const {
StringBuilder buf;
for ( unsigned i=0; i<nkeys; i++)
buf.append( get(i) > 0 ? "+" : "-" );
return buf.str();
}*/
static Ordering make(const BSONObj& obj) {
unsigned b = 0;
BSONObjIterator k(obj);
unsigned n = 0;
while (1) {
BSONElement e = k.next();
if (e.eoo())
break;
uassert(13103, "too many compound keys", n <= 31);
if (e.number() < 0)
b |= (1 << n);
n++;
}
return Ordering(b);
}
};
}
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