# std::experimental::pmr::unsynchronized_pool_resource::do_allocate

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< cpp‎ | experimental‎ | unsynchronized pool resource

virtual void* do_allocate(std::size_t bytes, std::size_t alignment); |  | (library fundamentals TS)

Allocates storage.

If the pool selected for a block of size `bytes` is unable to satisfy the request from its internal data structures, calls `allocate()` on the upstream memory resource to obtain memory.

If the size requested is larger than what the largest pool can handle, memory is allocated by calling `allocate()` on the upstream memory resource.

### Return value

A pointer to allocated storage of at least `bytes` bytes in size, aligned to the specified `alignment` if such alignment is supported, and to alignof(std::max_align_t) otherwise.

### Exceptions

Throws nothing unless calling `allocate()` on the upstream memory resource throws.

### See also

allocate | allocates memory (public member function of `std::experimental::pmr::memory_resource`)
do_allocate [virtual] | allocates memory (virtual protected member function of `std::experimental::pmr::memory_resource`)

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