# std::pmr::polymorphic_allocator<T>::deallocate_bytes

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< cpp‎ | memory‎ | polymorphic allocator

void deallocate_bytes( void* p, std::size_t nbytes, std::size_t alignment = alignof( std::max_align_t ) ); |  | (since C++20)

Deallocates the storage pointed to by `p`, which must have been allocated from a std::pmr::memory_resource x that compares equal to *resource(). using x.allocate(nbytes, alignment), typically through a call to allocate_bytes(nbytes, alignment.

Equivalent to resorce()->deallocate(p, nbytes, alignment);

### Parameters

p | - | pointer to memory to deallocate
nbytes | - | the number of bytes originally allocated
alignment | - | the alignment originally allocated

### Exceptions

Throws nothing.

### Notes

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

### See also

deallocate_object (C++20) | Frees raw memory obtained by allocate_object (public member function)
delete_object (C++20) | Destroys and deallocates an object (public member function)
deallocate [static] | deallocates storage using the allocator (public static member function of `std::allocator_traits<Alloc>`)
deallocate | deallocates memory (public member function of `std::pmr::memory_resource`)

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