std::pmr::polymorphic_allocator<T>::allocate_bytes

Since C++20

[[nodiscard]] void* allocate_bytes( std::size_t nbytes,
                                    std::size_t alignment = alignof(std::max_align_t) );

Allocates nbytes bytes of storage at specified alignment alignment using the underlying memory resource.
Equivalent to return resource()->allocate(nbytes, alignment);.

Parameters

nbytes - the number of bytes to allocate
alignment - the alignment to use

Return value

A pointer to the allocated storage.

Notes

This function was introduced for use with the fully-specialized allocator std::pmr::polymorphic_allocator<>, but it may be useful in any specialization.

The return type is void* (rather than, e.g., std::byte*) to support conversion to an arbitrary pointer type U* by static_cast<U*>.

Exceptions

May throw any exceptions thrown by the call to resource()->allocate.