Dynamic memory management
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Garbage collection support
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)
(C++11)(until C++23)

template< class U >
[[nodiscard]] U* allocate_object( std::size_t n = 1 );
(since C++20)

Allocates storage for n objects of type U using the underlying memory resource.

If std::numeric_limits<std::size_t>::max() / sizeof(U) < n, throws std::bad_array_new_length, otherwise equivalent to return static_cast<U*>(allocate_bytes(n * sizeof(U), alignof(U)));.


[edit] Parameters

n - the number of objects to allocate storage for

[edit] Return value

A pointer to the allocated storage.

[edit] Notes

This function was introduced for use with the fully-specialized allocator std::pmr::polymorphic_allocator<>, but it may be useful in any specialization as a shortcut to avoid having to rebind from std::pmr::polymorphic_allocator<T> to std::pmr::polymorphic_allocator<U>.

Since U is not deduced, it must be provided as a template argument when calling this function.

[edit] Exceptions

Throws std::bad_array_new_length if n > std::numeric_limits<std::size_t>::max() / sizeof(U); may also be any exceptions thrown by the call to resource()->allocate.

[edit] See also

allocate raw aligned memory from the underlying resource
(public member function) [edit]
allocates and constructs an object
(public member function) [edit]
allocate memory
(public member function) [edit]
allocates uninitialized storage using the allocator
(public static member function of std::allocator_traits<Alloc>) [edit]
allocates memory
(public member function of std::pmr::memory_resource) [edit]