std::scoped_allocator_adaptor<OuterAlloc,InnerAlloc...>:: outermost , outermost-construct , outermost-destroy
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<
cpp
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memory
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scoped allocator adaptor
C++
Dynamic memory management
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std::scoped_allocator_adaptor
| Member functions | ||||
|
scoped_allocator_adaptor::outermost
scoped_allocator_adaptor::outermost-construct scoped_allocator_adaptor::outermost-destroy |
||||
| Non-member functions | ||||
|
(until C++20)
|
||||
| Deduction guides (C++17) |
|
template
<
class
Alloc
>
/* unspecified */ /*outermost*/ ( Alloc && alloc = * this ) ; |
(1) | ( exposition only* ) |
|
template
<
class
T,
class
...
Args
>
void /*outermost-construct*/ ( T * p, Args && ... args ) ; |
(2) | ( exposition only* ) |
|
template
<
class
T
>
void /*outermost-destroy*/ ( T * p ) ; |
(3) | ( exposition only* ) |
These exposition-only helper member function templates are used in member functions
construct()
and
destroy()
.
1)
Obtains the outermost allocator of
alloc
.
-
If the expression
alloc.
outer_allocator
(
)
is valid, returns
outermost ( alloc. outer_allocator ( ) ) . - Otherwise, returns alloc .
2,3)
Constructs or destroys an object using the outermost allocator of
*
this
.
Given the type
std::
allocator_traits
<
std::
remove_reference_t
<
decltype
(
outermost
(
)
)
>>
as
outermost_traits
:
2)
Equivalent to
outermost_traits
::
construct
(
outermost
(
)
, p,
std::
forward
<
Args
>
(
args
)
...
)
;
.
3)
Equivalent to
outermost_traits
::
destroy
(
outermost
(
)
, p
)
;
.
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 3116 | C++11 |
the recursion condition for
outermost
was “
alloc
has the member function
outer_allocator()
”
|
changed to “the expression
alloc. outer_allocator ( ) is valid” |
See also
|
[static]
|
constructs an object in the allocated storage
(function template) |
|
[static]
|
destructs an object stored in the allocated storage
(function template) |
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