/usr/include/android/utils/UniquePtr.h is in android-libutils-dev 21-3.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 | /*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.
*/
/* === NOTE === NOTE === NOTE === NOTE === NOTE === NOTE === NOTE === NOTE ===
*
* THIS IS A COPY OF libcore/include/UniquePtr.h AND AS SUCH THAT IS THE
* CANONICAL SOURCE OF THIS FILE. PLEASE KEEP THEM IN SYNC.
*
* === NOTE === NOTE === NOTE === NOTE === NOTE === NOTE === NOTE === NOTE ===
*/
#ifndef UNIQUE_PTR_H_included
#define UNIQUE_PTR_H_included
#include <cstdlib> // For NULL.
// Default deleter for pointer types.
template <typename T>
struct DefaultDelete {
enum { type_must_be_complete = sizeof(T) };
DefaultDelete() {}
void operator()(T* p) const {
delete p;
}
};
// Default deleter for array types.
template <typename T>
struct DefaultDelete<T[]> {
enum { type_must_be_complete = sizeof(T) };
void operator()(T* p) const {
delete[] p;
}
};
// A smart pointer that deletes the given pointer on destruction.
// Equivalent to C++0x's std::unique_ptr (a combination of boost::scoped_ptr
// and boost::scoped_array).
// Named to be in keeping with Android style but also to avoid
// collision with any other implementation, until we can switch over
// to unique_ptr.
// Use thus:
// UniquePtr<C> c(new C);
template <typename T, typename D = DefaultDelete<T> >
class UniquePtr {
public:
// Construct a new UniquePtr, taking ownership of the given raw pointer.
explicit UniquePtr(T* ptr = NULL) : mPtr(ptr) {
}
~UniquePtr() {
reset();
}
// Accessors.
T& operator*() const { return *mPtr; }
T* operator->() const { return mPtr; }
T* get() const { return mPtr; }
// Returns the raw pointer and hands over ownership to the caller.
// The pointer will not be deleted by UniquePtr.
T* release() __attribute__((warn_unused_result)) {
T* result = mPtr;
mPtr = NULL;
return result;
}
// Takes ownership of the given raw pointer.
// If this smart pointer previously owned a different raw pointer, that
// raw pointer will be freed.
void reset(T* ptr = NULL) {
if (ptr != mPtr) {
D()(mPtr);
mPtr = ptr;
}
}
private:
// The raw pointer.
T* mPtr;
// Comparing unique pointers is probably a mistake, since they're unique.
template <typename T2> bool operator==(const UniquePtr<T2>& p) const;
template <typename T2> bool operator!=(const UniquePtr<T2>& p) const;
// Disallow copy and assignment.
UniquePtr(const UniquePtr&);
void operator=(const UniquePtr&);
};
// Partial specialization for array types. Like std::unique_ptr, this removes
// operator* and operator-> but adds operator[].
template <typename T, typename D>
class UniquePtr<T[], D> {
public:
explicit UniquePtr(T* ptr = NULL) : mPtr(ptr) {
}
~UniquePtr() {
reset();
}
T& operator[](size_t i) const {
return mPtr[i];
}
T* get() const { return mPtr; }
T* release() __attribute__((warn_unused_result)) {
T* result = mPtr;
mPtr = NULL;
return result;
}
void reset(T* ptr = NULL) {
if (ptr != mPtr) {
D()(mPtr);
mPtr = ptr;
}
}
private:
T* mPtr;
// Disallow copy and assignment.
UniquePtr(const UniquePtr&);
void operator=(const UniquePtr&);
};
#if UNIQUE_PTR_TESTS
// Run these tests with:
// g++ -g -DUNIQUE_PTR_TESTS -x c++ UniquePtr.h && ./a.out
#include <stdio.h>
static void assert(bool b) {
if (!b) {
fprintf(stderr, "FAIL\n");
abort();
}
fprintf(stderr, "OK\n");
}
static int cCount = 0;
struct C {
C() { ++cCount; }
~C() { --cCount; }
};
static bool freed = false;
struct Freer {
void operator()(int* p) {
assert(*p == 123);
free(p);
freed = true;
}
};
int main(int argc, char* argv[]) {
//
// UniquePtr<T> tests...
//
// Can we free a single object?
{
UniquePtr<C> c(new C);
assert(cCount == 1);
}
assert(cCount == 0);
// Does release work?
C* rawC;
{
UniquePtr<C> c(new C);
assert(cCount == 1);
rawC = c.release();
}
assert(cCount == 1);
delete rawC;
// Does reset work?
{
UniquePtr<C> c(new C);
assert(cCount == 1);
c.reset(new C);
assert(cCount == 1);
}
assert(cCount == 0);
//
// UniquePtr<T[]> tests...
//
// Can we free an array?
{
UniquePtr<C[]> cs(new C[4]);
assert(cCount == 4);
}
assert(cCount == 0);
// Does release work?
{
UniquePtr<C[]> c(new C[4]);
assert(cCount == 4);
rawC = c.release();
}
assert(cCount == 4);
delete[] rawC;
// Does reset work?
{
UniquePtr<C[]> c(new C[4]);
assert(cCount == 4);
c.reset(new C[2]);
assert(cCount == 2);
}
assert(cCount == 0);
//
// Custom deleter tests...
//
assert(!freed);
{
UniquePtr<int, Freer> i(reinterpret_cast<int*>(malloc(sizeof(int))));
*i = 123;
}
assert(freed);
return 0;
}
#endif
#endif // UNIQUE_PTR_H_included
|