libcxx/test/std/containers/views/mdspan/layout_right/extents.verify.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
  10
  11 // <mdspan>
  12
  13 // template<class Extents>
  14 // class layout_left::mapping;
  15
  16 // If Extents is not a specialization of extents, then the program is
  17 // ill-formed.
  18
  19 // Mandates: If Extents::rank_dynamic() == 0 is true, then the size of the
  20 // multidimensional index space Extents() is representable as a value of type
  21 // typename Extents::index_type.
  22
  23 #include <mdspan>
  24
  25 void not_extents() {
  26   // expected-error-re@*:* {{static assertion failed {{.*}}layout_right::mapping template argument must be a specialization of extents}}
  27   [[maybe_unused]] std::layout_right::mapping<void> mapping;
  28 }
  29
  30 void representable() {
  31   // expected-error-re@*:* {{static assertion failed {{.*}}layout_right::mapping product of static extents must be representable as index_type.}}
  32   [[maybe_unused]] std::layout_right::mapping<std::extents<signed char, 20, 20>> mapping;
  33 }