| CARVIEW |
Select Language
HTTP/1.1 301 Moved Permanently
Server: nginx
Date: Mon, 21 Jul 2025 16:31:49 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Location: /reference/memory/shared_ptr/unique/
HTTP/1.1 200 OK
Server: nginx
Date: Mon, 21 Jul 2025 16:31:50 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
ETag: W/"8fa3-k2NpCG8TfIdV+Fin8kS54+Fytq4"
Content-Encoding: gzip
Returns whether the shared_ptr object does not share ownership over its pointer with other shared_ptr objects (i.e., it is unique).
Empty pointers are never unique (as they do not own any pointers).
Unique shared_ptr objects are responsible to delete their managed object if they release this ownership (see the destructor).
This function shall return the same as (use_count()==1), although it may do so in a more efficient way.
Output:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
-
<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
-
<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
-
<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
-
<array>C++11
- <deque>
-
<forward_list>C++11
- <list>
- <map>
- <queue>
- <set>
- <stack>
-
<unordered_map>C++11
-
<unordered_set>C++11
- <vector>
-
Input/Output:
Multi-threading:
-
<atomic>C++11
-
<condition_variable>C++11
-
<future>C++11
-
<mutex>C++11
-
<thread>C++11
-
Other:
- <algorithm>
- <bitset>
-
<chrono>C++11
-
<codecvt>C++11
- <complex>
- <exception>
- <functional>
-
<initializer_list>C++11
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
-
<random>C++11
-
<ratio>C++11
-
<regex>C++11
- <stdexcept>
- <string>
-
<system_error>C++11
-
<tuple>C++11
-
<type_traits>C++11
-
<typeindex>C++11
- <typeinfo>
- <utility>
- <valarray>
<memory>
classes
- allocator
-
allocator_arg_tC++11
-
allocator_traitsC++11
- auto_ptr
- auto_ptr_ref
-
bad_weak_ptrC++11
-
default_deleteC++11
-
enable_shared_from_thisC++11
-
owner_lessC++11
-
pointer_traitsC++11
- raw_storage_iterator
-
shared_ptrC++11
-
unique_ptrC++11
-
uses_allocatorC++11
-
weak_ptrC++11
enum classes
-
pointer_safetyC++11
-
functions
-
addressofC++11
-
alignC++11
-
allocate_sharedC++11
-
const_pointer_castC++11
-
declare_no_pointersC++11
-
declare_reachableC++11
-
dynamic_pointer_castC++11
-
get_deleterC++11
-
get_pointer_safetyC++11
- get_temporary_buffer
-
make_sharedC++11
- return_temporary_buffer
-
static_pointer_castC++11
-
undeclare_no_pointersC++11
-
undeclare_reachableC++11
- uninitialized_copy
-
uninitialized_copy_nC++11
- uninitialized_fill
- uninitialized_fill_n
-
objects
-
allocator_argC++11
-
shared_ptr
-
shared_ptr::~shared_ptrC++11
-
shared_ptr::shared_ptrC++11
member functions
-
shared_ptr::getC++11
-
shared_ptr::operator boolC++11
-
shared_ptr::operator->C++11
-
shared_ptr::operator*C++11
-
shared_ptr::operator=C++11
-
shared_ptr::owner_beforeC++11
-
shared_ptr::resetC++11
-
shared_ptr::swapC++11
-
shared_ptr::uniqueC++11
-
shared_ptr::use_countC++11
-
non-member overloads
-
operator<< (shared_ptr)C++11
-
relational operators (shared_ptr)C++11
-
swap (shared_ptr)C++11
-
- Reference
- <memory>
- shared_ptr
- unique
public member function
<memory>
std::shared_ptr::unique
bool unique() const noexcept;
Check if unique
Empty pointers are never unique (as they do not own any pointers).
Unique shared_ptr objects are responsible to delete their managed object if they release this ownership (see the destructor).
This function shall return the same as (use_count()==1), although it may do so in a more efficient way.
Parameters
noneReturn value
true if this is a unique shared_ptr, false otherwise.Example
|
|
Output:
foo unique? 1: false 2: false 3: true |
See also
- shared_ptr::use_count
- Use count (public member function)
- shared_ptr::operator bool
- Check if not null (public member function)
- shared_ptr::get
- Get pointer (public member function)
Home page | Privacy policy
© cplusplus.com, 2000-2025 - All rights reserved - v3.3.4s
Spotted an error? contact us
© cplusplus.com, 2000-2025 - All rights reserved - v3.3.4s
Spotted an error? contact us