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This commit is contained in:
Jordan Maples [MSFT] 2020-02-18 14:09:11 -08:00
parent 8ba6cb1074
commit f4c608fd39
2 changed files with 29 additions and 30 deletions
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47
include/gsl/span
View File

@ -25,7 +25,6 @@
#include <array> // for array
#include <cstddef> // for ptrdiff_t, size_t, nullptr_t
#include <iterator> // for reverse_iterator, distance, random_access_...
#include <memory> // for std::addressof
#include <stdexcept>
#include <type_traits> // for enable_if_t, declval, is_convertible, inte...
#include <utility>
@ -147,14 +146,14 @@ namespace details
constexpr reference operator*() const noexcept
{
Expects(begin_ && current_ && end_);
Expects(begin_ && end_);
Expects(begin_ <= current_ && current_ < end_);
return *current_;
}
constexpr pointer operator->() const noexcept
{
Expects(begin_ && current_ && end_);
Expects(begin_ && end_);
Expects(begin_ <= current_ && current_ < end_);
return current_;
}
@ -175,7 +174,7 @@ namespace details
constexpr span_iterator& operator--() noexcept
{
Expects(begin_ && current_ && end_);
Expects(begin_ && end_);
Expects(begin_ < current_);
--current_;
return *this;
@ -346,7 +345,7 @@ namespace details
static_assert(Ext != dynamic_extent, "A fixed-size span must not have size == dynamic_extent");
constexpr extent_type() noexcept {}
constexpr extent_type() noexcept = default;
template <size_type Other>
constexpr extent_type(extent_type<Other> ext)
@ -433,7 +432,7 @@ public:
}
constexpr span(pointer firstElem, pointer lastElem) noexcept
: storage_(firstElem, static_cast<std::size_t>(std::distance(firstElem, lastElem)))
: storage_(firstElem, static_cast<std::size_t>(lastElem - firstElem))
{
if (Extent != dynamic_extent)
{ Expects(lastElem - firstElem == static_cast<difference_type>(Extent)); }
@ -442,7 +441,7 @@ public:
template <std::size_t N,
std::enable_if_t<details::is_allowed_extent_conversion<N, Extent>::value, int> = 0>
constexpr span(element_type (&arr)[N]) noexcept
: storage_(KnownNotNull{std::addressof(arr[0])}, details::extent_type<N>())
: storage_(KnownNotNull{arr + 0}, details::extent_type<N>())
{}
template <std::size_t N,
@ -465,8 +464,8 @@ public:
template <class Container,
class = std::enable_if_t<
!details::is_span<Container>::value && !details::is_std_array<Container>::value &&
std::is_convertible<typename Container::pointer, pointer>::value &&
std::is_convertible<decltype(std::declval<Container&>().data()), pointer>::value>>
std::is_pointer<decltype(std::declval<Container&>().data())>::value &&
std::is_convertible<std::remove_pointer_t<decltype(std::declval<Container&>().data())>(*)[], element_type(*)[]>::value>>
constexpr span(Container& cont) noexcept : span(cont.data(), cont.size())
{}
@ -474,8 +473,8 @@ public:
class = std::enable_if_t<
std::is_const<element_type>::value && !details::is_span<Container>::value &&
!details::is_std_array<Container>::value &&
std::is_convertible<typename Container::pointer, pointer>::value &&
std::is_convertible<decltype(std::declval<Container&>().data()), pointer>::value>>
std::is_pointer<decltype(std::declval<const Container&>().data())>::value &&
std::is_convertible<std::remove_pointer_t<decltype(std::declval<const Container&>().data())>(*)[], element_type(*)[]>::value>>
constexpr span(const Container& cont) noexcept : span(cont.data(), cont.size())
{}
@ -497,7 +496,6 @@ public:
template <std::size_t Count>
constexpr span<element_type, Count> first() const noexcept
{
Expects(Count != dynamic_extent);
Expects(Count <= size());
return {data(), Count};
}
@ -505,20 +503,19 @@ public:
template <std::size_t Count>
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
constexpr span<element_type, Count> last() const noexcept
// clang-format on
constexpr span<element_type, Count> last() const noexcept
{
Expects(Count != dynamic_extent);
Expects(size() >= Count);
Expects(Count <= size());
return {data() + (size() - Count), Count};
}
template <std::size_t Offset, std::size_t Count = dynamic_extent>
// clang-format off
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute
// clang-format on
constexpr auto subspan() const noexcept ->
typename details::calculate_subspan_type<ElementType, Extent, Offset, Count>::type
// clang-format on
constexpr auto subspan() const noexcept ->
typename details::calculate_subspan_type<ElementType, Extent, Offset, Count>::type
{
Expects((size() >= Offset) && (Count == dynamic_extent || (Count <= size() - Offset)));
@ -589,8 +586,8 @@ public:
constexpr iterator end() const noexcept
{
const auto data = storage_.data();
const auto size = storage_.size();
return {data, data + size, data + size};
const auto endData = data + storage_.size();
return {data, endData, endData};
}
constexpr const_iterator cbegin() const noexcept
@ -602,8 +599,8 @@ public:
constexpr const_iterator cend() const noexcept
{
const auto data = storage_.data();
const auto size = storage_.size();
return {data, data + size, data + size};
const auto endData = data + storage_.size();
return {data, endData, endData};
}
constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator{end()}; }
@ -767,6 +764,7 @@ namespace details
template <class ElementType, std::size_t Extent>
struct calculate_byte_size : std::integral_constant<std::size_t, sizeof(ElementType) * Extent>
{
static_assert(Extent < dynamic_extent / sizeof(ElementType), "Size is too big.");
};
template <class ElementType>
@ -843,12 +841,11 @@ constexpr span<typename Ptr::element_type> make_span(Ptr& cont)
return span<typename Ptr::element_type>(cont);
}
// Specialization of gsl::at for span
template <class ElementType, std::size_t Extent>
constexpr ElementType& at(span<ElementType, Extent> s, index i)
{
// No bounds checking here because it is done in span::operator[] called below
Ensures(i >= 0);
Expects(i >= 0);
return s[static_cast<std::size_t>(i)];
}

12
tests/span_compatibility_tests.cpp
View File

@ -931,6 +931,8 @@ static_assert(!std::is_constructible<gsl::span<Base>, Derived (&)[3]>::value,
"!std::is_constructible<gsl::span<Base>, Derived(&)[3]>");
static_assert(!std::is_constructible<gsl::span<Base>, std::array<Derived, 3>&>::value,
"!std::is_constructible<gsl::span<Base>, std::array<Derived, 3>&>");
static_assert(!std::is_constructible<gsl::span<Base>, std::vector<Derived>&>::value,
"!std::is_constructible<gsl::span<Base>, std::vector<Derived>&>");
static_assert(!std::is_constructible<gsl::span<Base>, const gsl::span<Derived>&>::value,
"!std::is_constructible<gsl::span<Base>, const gsl::span<Derived>&>");
static_assert(!std::is_constructible<gsl::span<Base>, const gsl::span<Derived, 3>&>::value,
@ -1048,16 +1050,16 @@ static_assert(std::is_convertible<std::array<int, 3>&, gsl::span<const int>>::va
static_assert(std::is_convertible<const std::array<int, 3>&, gsl::span<const int>>::value,
"std::is_convertible<const std::array<int, 3>&, gsl::span<const int>>");
#if __cplusplus >= 201703l
template <typename U, typename = void>
inline constexpr bool AsWritableBytesCompilesFor = false;
static constexpr bool AsWritableBytesCompilesFor = false;
template <typename U>
inline constexpr bool AsWritableBytesCompilesFor<U, void_t<decltype(as_writable_bytes(declval<U>()))>> =
static constexpr bool AsWritableBytesCompilesFor<U, void_t<decltype(as_writable_bytes(declval<U>()))>> =
true;
static_assert(AsWritableBytesCompilesFor<gsl::span<int>>,
"AsWritableBytesCompilesFor<gsl::span<int>>");
static_assert(AsWritableBytesCompilesFor<gsl::span<int, 9>>,