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std::pmr::polymorphic_allocator::polymorphic_allocator

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Dynamic memory management
Uninitialized storage
(C++17)
(deprecated since c++17)
(deprecated since c++17)
(deprecated since c++17)
Garbage collection support
Miscellaneous
(C++20)
(C++11)
(C++11)
C Library
Low level memory management
 
 
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( 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 memory_resource*.

Contents

[edit] Parameters

other - another polymorphic_allocator to copy from
r - pointer to the memory resource to use. May not be null.

[edit] Exceptions

4) Throws nothing.

[edit] 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.

[edit] See also

Create a new polymorphic_allocator for use by a container's copy constructor
(public member function) [edit]