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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
// <mdspan>
// Test construction from integral:
//
// template<class ... OtherIndexTypes>
// constexpr explicit extents(OtherIndexTypes ... exts) noexcept;
//
// Let N be sizeof...(OtherIndexTypes), and let
// exts_arr be array<index_type, N>{static_cast<index_type>(std::move(exts))...}.
//
// Constraints:
// * (is_convertible_v<OtherIndexTypes, index_type> && ...) is true,
// * (is_nothrow_constructible_v<index_type, OtherIndexType> && ...) is true, and
// * N == rank_dynamic() || N == rank() is true.
//
// Preconditions:
// * If N != rank_dynamic() is true, exts_arr[r] equals Er for each r for which
// Er is a static extent, and
// * either
// - sizeof...(exts) == 0 is true, or
// - each element of exts is nonnegative and is representable as a value of type index_type.
//
#include <mdspan>
#include <cassert>
#include <type_traits>
#include "../ConvertibleToIntegral.h"
#include "CtorTestCombinations.h"
#include "test_macros.h"
struct IntegralCtorTest {
template <class E, class AllExtents, class Extents, size_t... Indices>
static constexpr void test_construction(AllExtents all_ext, Extents ext, std::index_sequence<Indices...>) {
// construction from indices
ASSERT_NOEXCEPT(E(ext[Indices]...));
test_runtime_observers(E(ext[Indices]...), all_ext);
}
};
int main(int, char**) {
test_index_type_combo<IntegralCtorTest>();
static_assert(test_index_type_combo<IntegralCtorTest>());
constexpr size_t D = std::dynamic_extent;
using E = std::extents<int, 1, D, 3, D>;
// check can't construct from too few arguments
static_assert(!std::is_constructible_v<E, int>, "extents constructible from illegal arguments");
// check can't construct from rank_dynamic < #args < rank
static_assert(!std::is_constructible_v<E, int, int, int>, "extents constructible from illegal arguments");
// check can't construct from too many arguments
static_assert(!std::is_constructible_v<E, int, int, int, int, int>, "extents constructible from illegal arguments");
// test construction fails from types not convertible to index_type but convertible to other integer types
static_assert(std::is_convertible_v<IntType, int>, "Test helper IntType unexpectedly not convertible to int");
static_assert(!std::is_constructible_v< std::extents<unsigned long, D>, IntType>,
"extents constructible from illegal arguments");
return 0;
}
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