<random>: Fix minor conformance issues
#4120
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Remove it outright for Standard `discard_block_engine` (via the new base class `_Discard_block_base`), `independent_bits_engine`, and `shuffle_order_engine`. For `discard_block`, which is usually the base class for Standard `discard_block_engine`, we can guard the typedef with TR1's availability, and deprecate it. We should then avoid using it ourselves.
…scard_block_base`. `discard_block_engine` had an `_Engine&&` constructor but its base classes didn't, so it was always copying.
CaseyCarter
approved these changes
Oct 24, 2023
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I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
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base_typein<random>is a non-Standard typedef.discard_block_engine(via the new base class_Discard_block_baseintroduced by Implement LWG-3561 Issue with internal counter indiscard_block_engine#4066),independent_bits_engine, andshuffle_order_engine.discard_block, which is usually the base class for Standarddiscard_block_engine, we can guard the typedef with TR1's availability, and deprecate it. We should then avoid using it ourselves._Engine&&constructors todiscard_blockand_Discard_block_base.discard_block_enginehad an_Engine&&constructor but its base classes didn't, so it was always copying.