You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
212 lines
7.3 KiB
C++
212 lines
7.3 KiB
C++
// -*- C++ -*-
|
|
//===------------------------------ span ---------------------------------===//
|
|
//
|
|
// 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++98, c++03, c++11, c++14, c++17
|
|
|
|
// <span>
|
|
|
|
// template<size_t Offset, size_t Count = dynamic_extent>
|
|
// constexpr span<element_type, see below> subspan() const;
|
|
//
|
|
// constexpr span<element_type, dynamic_extent> subspan(
|
|
// index_type offset, index_type count = dynamic_extent) const;
|
|
//
|
|
// Requires: (0 <= Offset && Offset <= size())
|
|
// && (Count == dynamic_extent || Count >= 0 && Offset + Count <= size())
|
|
|
|
#include <span>
|
|
#include <cassert>
|
|
#include <algorithm>
|
|
#include <string>
|
|
|
|
#include "test_macros.h"
|
|
|
|
template <typename Span, size_t Offset, size_t Count>
|
|
constexpr bool testConstexprSpan(Span sp)
|
|
{
|
|
LIBCPP_ASSERT((noexcept(sp.template subspan<Offset, Count>())));
|
|
LIBCPP_ASSERT((noexcept(sp.subspan(Offset, Count))));
|
|
auto s1 = sp.template subspan<Offset, Count>();
|
|
auto s2 = sp.subspan(Offset, Count);
|
|
using S1 = decltype(s1);
|
|
using S2 = decltype(s2);
|
|
ASSERT_SAME_TYPE(typename Span::value_type, typename S1::value_type);
|
|
ASSERT_SAME_TYPE(typename Span::value_type, typename S2::value_type);
|
|
static_assert(S1::extent == (Span::extent == std::dynamic_extent ? std::dynamic_extent : Count), "");
|
|
static_assert(S2::extent == std::dynamic_extent, "");
|
|
return
|
|
s1.data() == s2.data()
|
|
&& s1.size() == s2.size()
|
|
&& std::equal(s1.begin(), s1.end(), sp.begin() + Offset);
|
|
}
|
|
|
|
template <typename Span, size_t Offset>
|
|
constexpr bool testConstexprSpan(Span sp)
|
|
{
|
|
LIBCPP_ASSERT((noexcept(sp.template subspan<Offset>())));
|
|
LIBCPP_ASSERT((noexcept(sp.subspan(Offset))));
|
|
auto s1 = sp.template subspan<Offset>();
|
|
auto s2 = sp.subspan(Offset);
|
|
using S1 = decltype(s1);
|
|
using S2 = decltype(s2);
|
|
ASSERT_SAME_TYPE(typename Span::value_type, typename S1::value_type);
|
|
ASSERT_SAME_TYPE(typename Span::value_type, typename S2::value_type);
|
|
static_assert(S1::extent == (Span::extent == std::dynamic_extent ? std::dynamic_extent : Span::extent - Offset), "");
|
|
static_assert(S2::extent == std::dynamic_extent, "");
|
|
return
|
|
s1.data() == s2.data()
|
|
&& s1.size() == s2.size()
|
|
&& std::equal(s1.begin(), s1.end(), sp.begin() + Offset, sp.end());
|
|
}
|
|
|
|
|
|
template <typename Span, size_t Offset, size_t Count>
|
|
void testRuntimeSpan(Span sp)
|
|
{
|
|
LIBCPP_ASSERT((noexcept(sp.template subspan<Offset, Count>())));
|
|
LIBCPP_ASSERT((noexcept(sp.subspan(Offset, Count))));
|
|
auto s1 = sp.template subspan<Offset, Count>();
|
|
auto s2 = sp.subspan(Offset, Count);
|
|
using S1 = decltype(s1);
|
|
using S2 = decltype(s2);
|
|
ASSERT_SAME_TYPE(typename Span::value_type, typename S1::value_type);
|
|
ASSERT_SAME_TYPE(typename Span::value_type, typename S2::value_type);
|
|
static_assert(S1::extent == (Span::extent == std::dynamic_extent ? std::dynamic_extent : Count), "");
|
|
static_assert(S2::extent == std::dynamic_extent, "");
|
|
assert(s1.data() == s2.data());
|
|
assert(s1.size() == s2.size());
|
|
assert(std::equal(s1.begin(), s1.end(), sp.begin() + Offset));
|
|
}
|
|
|
|
|
|
template <typename Span, size_t Offset>
|
|
void testRuntimeSpan(Span sp)
|
|
{
|
|
LIBCPP_ASSERT((noexcept(sp.template subspan<Offset>())));
|
|
LIBCPP_ASSERT((noexcept(sp.subspan(Offset))));
|
|
auto s1 = sp.template subspan<Offset>();
|
|
auto s2 = sp.subspan(Offset);
|
|
using S1 = decltype(s1);
|
|
using S2 = decltype(s2);
|
|
ASSERT_SAME_TYPE(typename Span::value_type, typename S1::value_type);
|
|
ASSERT_SAME_TYPE(typename Span::value_type, typename S2::value_type);
|
|
static_assert(S1::extent == (Span::extent == std::dynamic_extent ? std::dynamic_extent : Span::extent - Offset), "");
|
|
static_assert(S2::extent == std::dynamic_extent, "");
|
|
assert(s1.data() == s2.data());
|
|
assert(s1.size() == s2.size());
|
|
assert(std::equal(s1.begin(), s1.end(), sp.begin() + Offset, sp.end()));
|
|
}
|
|
|
|
|
|
constexpr int carr1[] = {1,2,3,4};
|
|
int arr1[] = {5,6,7};
|
|
|
|
int main(int, char**)
|
|
{
|
|
{
|
|
using Sp = std::span<const int>;
|
|
static_assert(testConstexprSpan<Sp, 0>(Sp{}), "");
|
|
|
|
static_assert(testConstexprSpan<Sp, 0, 4>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 0, 3>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 0, 2>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 0, 1>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 0, 0>(Sp{carr1}), "");
|
|
|
|
static_assert(testConstexprSpan<Sp, 1, 3>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 2, 2>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 3, 1>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 4, 0>(Sp{carr1}), "");
|
|
}
|
|
|
|
{
|
|
using Sp = std::span<const int, 4>;
|
|
|
|
static_assert(testConstexprSpan<Sp, 0, 4>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 0, 3>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 0, 2>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 0, 1>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 0, 0>(Sp{carr1}), "");
|
|
|
|
static_assert(testConstexprSpan<Sp, 1, 3>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 2, 2>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 3, 1>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 4, 0>(Sp{carr1}), "");
|
|
}
|
|
|
|
{
|
|
using Sp = std::span<const int>;
|
|
static_assert(testConstexprSpan<Sp, 0>(Sp{}), "");
|
|
|
|
static_assert(testConstexprSpan<Sp, 0>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 1>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 2>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 3>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 4>(Sp{carr1}), "");
|
|
}
|
|
|
|
{
|
|
using Sp = std::span<const int, 4>;
|
|
|
|
static_assert(testConstexprSpan<Sp, 0>(Sp{carr1}), "");
|
|
|
|
static_assert(testConstexprSpan<Sp, 1>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 2>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 3>(Sp{carr1}), "");
|
|
static_assert(testConstexprSpan<Sp, 4>(Sp{carr1}), "");
|
|
}
|
|
|
|
{
|
|
using Sp = std::span<int>;
|
|
testRuntimeSpan<Sp, 0>(Sp{});
|
|
|
|
testRuntimeSpan<Sp, 0, 3>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 0, 2>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 0, 1>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 0, 0>(Sp{arr1});
|
|
|
|
testRuntimeSpan<Sp, 1, 2>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 2, 1>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 3, 0>(Sp{arr1});
|
|
}
|
|
|
|
{
|
|
using Sp = std::span<int, 3>;
|
|
|
|
testRuntimeSpan<Sp, 0, 3>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 0, 2>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 0, 1>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 0, 0>(Sp{arr1});
|
|
|
|
testRuntimeSpan<Sp, 1, 2>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 2, 1>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 3, 0>(Sp{arr1});
|
|
}
|
|
|
|
{
|
|
using Sp = std::span<int>;
|
|
testRuntimeSpan<Sp, 0>(Sp{});
|
|
|
|
testRuntimeSpan<Sp, 0>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 1>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 2>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 3>(Sp{arr1});
|
|
}
|
|
|
|
{
|
|
using Sp = std::span<int, 3>;
|
|
|
|
testRuntimeSpan<Sp, 0>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 1>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 2>(Sp{arr1});
|
|
testRuntimeSpan<Sp, 3>(Sp{arr1});
|
|
}
|
|
|
|
return 0;
|
|
}
|