/usr/include/mongo/base/data_view.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 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | /* Copyright 2014 MongoDB 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/config.h"
#include <cstring>
#include "mongo/platform/endian.h"
#if __cplusplus >= 201103L
#include <type_traits>
#endif
namespace mongo {
class ConstDataView {
public:
typedef const char* bytes_type;
ConstDataView(bytes_type bytes) : _bytes(bytes) {}
bytes_type view(std::size_t offset = 0) const {
return _bytes + offset;
}
template <typename T>
const ConstDataView& readNative(T* t, size_t offset = 0) const {
#if MONGO_HAVE_STD_IS_TRIVIALLY_COPYABLE
static_assert(std::is_trivially_copyable<T>::value,
"Type for DataView::readNative must be trivially copyable");
#endif
std::memcpy(t, view(offset), sizeof(*t));
return *this;
}
template <typename T>
T readNative(std::size_t offset = 0) const {
T t;
readNative(&t, offset);
return t;
}
template <typename T>
T readLE(std::size_t offset = 0) const {
return endian::littleToNative(readNative<T>(offset));
}
template <typename T>
T readBE(std::size_t offset = 0) const {
return endian::bigToNative(readNative<T>(offset));
}
private:
bytes_type _bytes;
};
class DataView : public ConstDataView {
public:
typedef char* bytes_type;
DataView(bytes_type bytes) : ConstDataView(bytes) {}
bytes_type view(std::size_t offset = 0) const {
// It is safe to cast away const here since the pointer stored in our base class was
// originally non-const by way of our constructor.
return const_cast<bytes_type>(ConstDataView::view(offset));
}
template <typename T>
DataView& writeNative(const T& value, std::size_t offset = 0) {
#if MONGO_HAVE_STD_IS_TRIVIALLY_COPYABLE
static_assert(std::is_trivially_copyable<T>::value,
"Type for DataView::writeNative must be trivially copyable");
#endif
std::memcpy(view(offset), &value, sizeof(value));
return *this;
}
template <typename T>
DataView& writeLE(const T& value, std::size_t offset = 0) {
return writeNative(endian::nativeToLittle(value), offset);
}
template <typename T>
DataView& writeBE(const T& value, std::size_t offset = 0) {
return writeNative(endian::nativeToBig(value), offset);
}
};
} // namespace mongo
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