std::pmr::polymorphic_allocator<T>:: polymorphic_allocator
From cppreference.com
<
cpp
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memory
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polymorphic allocator
C++
Dynamic memory management
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std::pmr::polymorphic_allocator
| Member functions | ||||
|
polymorphic_allocator::polymorphic_allocator
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||||
|
(
C++20/26*
)
|
||||
| Non-member functions | ||||
|
(until C++20)
|
|
polymorphic_allocator
(
)
noexcept
;
|
(1) | |
|
polymorphic_allocator
(
const
polymorphic_allocator
&
other
)
=
default
;
|
(2) | |
|
template
<
class
U
>
polymorphic_allocator ( const polymorphic_allocator < U > & other ) noexcept ; |
(3) | |
|
polymorphic_allocator
(
std::
pmr
::
memory_resource
*
r
)
;
|
(4) | |
Constructs a new
polymorphic_allocator
.
1)
Constructs a
polymorphic_allocator
using the return value of
std::
pmr
::
get_default_resource
(
)
as the underlying memory resource.
2,3)
Constructs a
polymorphic_allocator
using
other.
resource
(
)
as the underlying memory resource.
4)
Constructs a
polymorphic_allocator
using
r
as the underlying memory resource. This constructor provides an implicit conversion from
std::
pmr
::
memory_resource
*
.
Parameters
| other | - |
another
polymorphic_allocator
to copy from
|
| r | - | pointer to the memory resource to use. May not be null |
Exceptions
4)
Throws nothing.
Notes
Copying a container using a
polymorphic_allocator
will not call the allocator's copy constructor. Instead, the new container will use the return value of
select_on_container_copy_construction
(a default-constructed
polymorphic_allocator
) as its allocator.
See also
create a new
polymorphic_allocator
for use by a container's copy constructor
(public member function) |
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