/usr/include/mongo/base/string_data.h is in mongodb-dev 1:2.4.9-1ubuntu2.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 | // string_data.h
/* Copyright 2010 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 <algorithm> // for min
#include <cstring>
#include <iosfwd>
#include <limits>
#include <string>
namespace mongo {
using std::string;
/**
* A StringData object wraps a 'const string&' or a 'const char*' without copying its
* contents. The most common usage is as a function argument that takes any of the two
* forms of strings above. Fundamentally, this class tries go around the fact that string
* literals in C++ are char[N]'s.
*
* Notes:
*
* + The object StringData wraps around must be alive while the StringData is.
*
* + Because string data can be used to pass a substring around, one should never assume a
* rawData() terminates with a null.
*/
class StringData {
public:
/** Constructs an empty string data */
StringData()
: _data(NULL), _size(0) {}
/**
* Constructs a StringData, for the case where the length of string is not known. 'c'
* must be a pointer to a null-terminated string.
*/
StringData( const char* c )
: _data(c), _size((c == NULL) ? 0 : string::npos) {}
/**
* Constructs a StringData explicitly, for the case where the length of the string is
* already known. 'c' must be a pointer to a null-terminated string, and len must
* be the length that strlen(c) would return, a.k.a the index of the terminator in c.
*/
StringData( const char* c, size_t len )
: _data(c), _size(len) {}
/** Constructs a StringData, for the case of a string. */
StringData( const std::string& s )
: _data(s.c_str()), _size(s.size()) {}
/**
* Constructs a StringData explicitly, for the case of a literal whose size is known at
* compile time.
*/
struct LiteralTag {};
template<size_t N>
StringData( const char (&val)[N], LiteralTag )
: _data(&val[0]), _size(N-1) {}
/**
* Returns -1, 0, or 1 if 'this' is less, equal, or greater than 'other' in
* lexicographical order.
*/
int compare(const StringData& other) const;
/**
* note: this uses tolower, and therefore does not handle
* come languages correctly.
* should be use sparingly
*/
bool equalCaseInsensitive( const StringData& other ) const;
void copyTo( char* dest, bool includeEndingNull ) const;
StringData substr( size_t pos, size_t n = std::numeric_limits<size_t>::max() ) const;
//
// finders
//
size_t find( char c , size_t fromPos = 0 ) const;
size_t find( const StringData& needle ) const;
size_t rfind( char c, size_t fromPos = string::npos ) const;
/**
* Returns true if 'prefix' is a substring of this instance, anchored at position 0.
*/
bool startsWith( const StringData& prefix ) const;
/**
* Returns true if 'suffix' is a substring of this instance, anchored at the end.
*/
bool endsWith( const StringData& suffix ) const;
//
// accessors
//
/**
* Get the pointer to the first byte of StringData. This is not guaranteed to be
* null-terminated, so if using this without checking size(), you are likely doing
* something wrong.
*/
const char* rawData() const { return _data; }
size_t size() const { fillSize(); return _size; }
bool empty() const { return size() == 0; }
string toString() const { return string(_data, size()); }
char operator[] ( unsigned pos ) const { return _data[pos]; }
/**
* Functor compatible with std::hash for std::unordered_{map,set}
* Warning: The hash function is subject to change. Do not use in cases where hashes need
* to be consistent across versions.
*/
struct Hasher {
size_t operator() (const StringData& str) const;
};
private:
const char* _data; // is not guaranted to be null terminated (see "notes" above)
mutable size_t _size; // 'size' does not include the null terminator
void fillSize() const {
if (_size == string::npos) {
_size = strlen(_data);
}
}
};
inline bool operator==(const StringData& lhs, const StringData& rhs) {
return lhs.compare(rhs) == 0;
}
inline bool operator!=(const StringData& lhs, const StringData& rhs) {
return lhs.compare(rhs) != 0;
}
inline bool operator<(const StringData& lhs, const StringData& rhs) {
return lhs.compare(rhs) < 0 ;
}
inline bool operator<=(const StringData& lhs, const StringData& rhs) {
return lhs.compare(rhs) <= 0;
}
inline bool operator>(const StringData& lhs, const StringData& rhs) {
return lhs.compare(rhs) > 0;
}
inline bool operator>=(const StringData& lhs, const StringData& rhs) {
return lhs.compare(rhs) >= 0;
}
std::ostream& operator<<(std::ostream& stream, const StringData& value);
} // namespace mongo
#include "string_data-inl.h"
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