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# std::pmr::monotonic_buffer_resource::do_allocate

From cppreference.com
< cpp‎ | memory‎ | monotonic buffer resource

virtual void* do_allocate(std::size_t bytes, std::size_t alignment); |  | (since C++17)

Allocates storage.

If the current buffer has sufficient unused space to fit a block with the specified size and alignment, allocates the return block from the current buffer.

Otherwise, this function allocates a new buffer by calling `upstream_resource()->allocate(n, m)`, where `n` is not less than the greater of `bytes` and the next buffer size and `m` is not less than `alignment`. It sets the new buffer as the current buffer, increases the next buffer size by an implementation-defined growth factor (which is not necessarily integral), and then allocates the return block from the newly allocated buffer.

### [edit] 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.

### [edit] Exceptions

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

### [edit] See also

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

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