std::pmr::polymorphic_allocator::allocate_object - cppreference.com (original) (raw)

| template< class U >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

[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) [edit] | | | allocates memory (public member function of std::pmr::memory_resource) [edit] |