On 27/02/20 14:26 -0500, Patrick Palka wrote:
On Wed, 26 Feb 2020, Patrick Palka wrote:
On Tue, 11 Feb 2020, Patrick Palka wrote:
> This patch adds memoization for these four views so that their begin() has the
> required constant time amortized complexity.
>
> In the general case we use
or instead of having to use std::optional or
needing an external flag denoting the empty state of the cache, which is
both optimal space-wise and constexpr safe!
-- >8 --
Subject: [PATCH] libstdc++: Memoize
{drop,drop_while,filter,reverse}_view::begin
This patch adds memoization to these four views so
Here's v2 of this patch which uses the new helper
__detail::__maybe_empty_t and provides a more descriptive commit
message. It also refines the constraints on the partial specializations
of _CachedPosition.
-- >8 --
Subject: [PATCH] libstdc++: Memoize
{drop,drop_while,filter,reverse}_view::begi
This patch adds memoization for these four views so that their begin() has the
required constant time amortized complexity.
In the general case we use std::optional to cache the result. When the
underlying range is a random_access_range then we store the cache as an offset
from the beginning of
