[PATCH] D47111: <experimental/memory_resource>: Implement monotonic_buffer_resource.

[Arthur O'Dwyer via Phabricator via cfe-commits]

Quuxplusone updated this revision to Diff 148845.
Quuxplusone added a comment.

Refactor to remove unused fields from the header structs.

Before this change, `sizeof(monotonic_buffer_resource) == 56` and the overhead per allocated chunk was `40` bytes.
After this change, `sizeof(monotonic_buffer_resource) == 48` and the overhead per allocated chunk is `24` bytes.

Eric suggests replacing `size_t __align_` with `uint8_t __log2_align_`. I'm amenable to this idea, but I'd want to know what's the best way to compute the log2 of a user-supplied number.


Repository:
  rCXX libc++

https://reviews.llvm.org/D47111

Files:
  include/experimental/memory_resource
  src/experimental/memory_resource.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.ctor/copy_move.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.ctor/with_default_resource.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.ctor/without_buffer.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.mem/allocate_deallocate.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.mem/allocate_exception_safety.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.mem/allocate_from_initial_buffer.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.mem/allocate_from_underaligned_buffer.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.mem/allocate_from_zero_sized_buffer.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.mem/allocate_in_geometric_progression.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.mem/allocate_overaligned_request.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/monotonic.buffer.mem/equality.pass.cpp
  test/std/experimental/memory/memory.resource.monotonic.buffer/nothing_to_do.pass.cpp

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