b4ff893877
This commit implements layout_left in support of C++23 mdspan (https://wg21.link/p0009). layout_left is a layout mapping policy whose index mapping corresponds to the memory layout of Fortran arrays. Thus the left most index has stride-1 access, and the right most index is associated with the largest stride. Co-authored-by: Damien L-G <dalg24@gmail.com> Differential Revision: https://reviews.llvm.org/D153783
34 lines
1.3 KiB
C++
34 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
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// <mdspan>
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// template<class Extents>
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// class layout_left::mapping;
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// If Extents is not a specialization of extents, then the program is
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// ill-formed.
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// Mandates: If Extents::rank_dynamic() == 0 is true, then the size of the
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// multidimensional index space Extents() is representable as a value of type
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// typename Extents::index_type.
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#include <mdspan>
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void not_extents() {
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// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}layout_left::mapping template argument must be a specialization of extents}}
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[[maybe_unused]] std::layout_left::mapping<void> mapping;
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}
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void representable() {
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// expected-error-re@*:* {{{{(static_assert|static assertion)}} failed {{.*}}layout_left::mapping product of static extents must be representable as index_type.}}
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[[maybe_unused]] std::layout_left::mapping<std::extents<char, 20, 20>> mapping;
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}
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