<ranges>: Improve implementation of recommended practices in views::cartesian_product
#3839
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fsb4000
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Jun 29, 2023
tests/std/tests/P2374R4_views_cartesian_product_recommended_practices/test.compile.pass.cpp
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StephanTLavavej
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Jul 4, 2023
tests/std/tests/P2374R4_views_cartesian_product_recommended_practices/test.compile.pass.cpp
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Addresses microsoft#3839 (comment)
Addresses microsoft#3839 (comment)
… specialization Addresses microsoft#3839 (comment)
… range is 0 Addresses microsoft#3839 (comment)
StephanTLavavej
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Jul 4, 2023
strega-nil-ms
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Jul 5, 2023
| #if _HAS_CXX23 | ||
| template <class _Rng, class _Fn, size_t _Nx> | ||
| inline constexpr auto _Compile_time_max_size<adjacent_transform_view<_Rng, _Fn, _Nx>> = | ||
| _Compile_time_max_size<adjacent_view<_Rng, _Nx>>; |
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no change requested - this could be _Adjacent_view_compile_time_max_size<_Rng, _Nx>() to avoid the indirection.
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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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Thanks for enhancing this metaprogramming! 📈 🚀 ✨ |
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In #3561 I've introduced
_Compile_time_max_sizetemplate variable that detects ranges with max size known at compile time. Those types currently are:const? std::array<T, N>(_Compile_time_max_size = N),const? std::span<T, N>(_Compile_time_max_size = N),const? ref_view<T>(_Compile_time_max_size = _Compile_time_max_size<T>),const? owning_view<T>(_Compile_time_max_size = _Compile_time_max_size<T>).sizefunction, likeempty_view(_Compile_time_max_size = 0),single_view(_Compile_time_max_size = 1).(More about this approach: #3561, 'implementation details' section).
This PR expands influence of
_Compile_time_max_sizeto all possible range adaptors and to C-style arrays.