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initial impl of P1976R2

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This commit is contained in:
Jordan Maples 2020-05-19 16:27:46 -07:00
parent 1999b48a51
commit 2085c7acde
6 changed files with 1267 additions and 1241 deletions
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47
include/gsl/span
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@ -420,18 +420,28 @@ public:
constexpr span() noexcept : storage_(nullptr, details::extent_type<0>())
{}
template<std::size_t extent = Extent, std::enable_if_t<extent != gsl::dynamic_extent, int> = 0>
constexpr span(pointer ptr, size_type count) noexcept : storage_(ptr, count)
{
if (Extent != dynamic_extent) Expects(count == Extent);
Expects(count == Extent);
}
template<std::size_t extent = Extent, std::enable_if_t<extent == gsl::dynamic_extent, int> = 0>
constexpr explicit span(pointer ptr, size_type count) noexcept : storage_(ptr, count)
{}
template<std::size_t extent = Extent, std::enable_if_t<extent != gsl::dynamic_extent, int> = 0>
constexpr span(pointer firstElem, pointer lastElem) noexcept
: storage_(firstElem, static_cast<std::size_t>(lastElem - firstElem))
{
if (Extent != dynamic_extent)
{ Expects(lastElem - firstElem == static_cast<difference_type>(Extent)); }
Expects(lastElem - firstElem == static_cast<difference_type>(Extent));
}
template<std::size_t extent = Extent, std::enable_if_t<extent == gsl::dynamic_extent, int> = 0>
constexpr span(pointer firstElem, pointer lastElem) noexcept
: storage_(firstElem, static_cast<std::size_t>(lastElem - firstElem))
{}
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
@ -482,14 +492,25 @@ public:
constexpr span(const span& other) noexcept = default;
template <
class OtherElementType, std::size_t OtherExtent,
class = std::enable_if_t<
details::is_allowed_extent_conversion<OtherExtent, Extent>::value &&
details::is_allowed_element_type_conversion<OtherElementType, element_type>::value>>
class OtherElementType, std::size_t OtherExtent, std::size_t MyExtent = Extent,
std::enable_if_t<
!(MyExtent != dynamic_extent && OtherExtent == dynamic_extent) &&
(Extent == dynamic_extent || OtherExtent == dynamic_extent || Extent == OtherExtent) &&
details::is_allowed_element_type_conversion<OtherElementType, element_type>::value, int> = 0>
constexpr span(const span<OtherElementType, OtherExtent>& other) noexcept
: storage_(other.data(), details::extent_type<OtherExtent>(other.size()))
{}
template <
class OtherElementType, std::size_t OtherExtent, std::size_t MyExtent = Extent,
std::enable_if_t<
(MyExtent != dynamic_extent && OtherExtent == dynamic_extent) &&
(Extent == dynamic_extent || OtherExtent == dynamic_extent || Extent == OtherExtent) &&
details::is_allowed_element_type_conversion<OtherElementType, element_type>::value, int> = 0>
constexpr explicit span(const span<OtherElementType, OtherExtent>& other) noexcept
: storage_(other.data(), details::extent_type<OtherExtent>(other.size()))
{}
~span() noexcept = default;
constexpr span& operator=(const span& other) noexcept = default;
@ -519,14 +540,14 @@ public:
typename details::calculate_subspan_type<ElementType, Extent, Offset, Count>::type
{
Expects((size() >= Offset) && (Count == dynamic_extent || (Count <= size() - Offset)));
return {data() + Offset, Count == dynamic_extent ? size() - Offset : Count};
using type = typename details::calculate_subspan_type<ElementType, Extent, Offset, Count>::type;
return type(data() + Offset, Count == dynamic_extent ? size() - Offset : Count);
}
constexpr span<element_type, dynamic_extent> first(size_type count) const noexcept
{
Expects(count <= size());
return {data(), count};
return span<element_type>(data(), count);
}
constexpr span<element_type, dynamic_extent> last(size_type count) const noexcept
@ -731,7 +752,8 @@ as_bytes(span<ElementType, Extent> s) noexcept
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return {reinterpret_cast<const byte*>(s.data()), s.size_bytes()};
return span<const byte, details::calculate_byte_size<ElementType, Extent>::value>(
reinterpret_cast<const byte*>(s.data()), s.size_bytes());
}
template <class ElementType, std::size_t Extent,
@ -742,7 +764,8 @@ as_writable_bytes(span<ElementType, Extent> s) noexcept
// clang-format off
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
// clang-format on
return {reinterpret_cast<byte*>(s.data()), s.size_bytes()};
return span<byte, details::calculate_byte_size<ElementType, Extent>::value>(
reinterpret_cast<byte*>(s.data()), s.size_bytes());
}
} // namespace gsl

4
include/gsl/string_span
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@ -121,7 +121,7 @@ span<T, dynamic_extent> ensure_sentinel(T* seq,
GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute // TODO: suppress does not work
while (static_cast<std::size_t>(cur - seq) < max && *cur != Sentinel) ++cur;
Ensures(*cur == Sentinel);
return {seq, static_cast<std::size_t>(cur - seq)};
return span<T>(seq, static_cast<std::size_t>(cur - seq));
}
//
@ -308,7 +308,7 @@ public:
private:
static impl_type remove_z(pointer const& sz, std::size_t max)
{
return {sz, details::string_length(sz, max)};
return impl_type(sz, details::string_length(sz, max));
}
template <std::size_t N>

14
tests/span_compatibility_tests.cpp
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@ -846,8 +846,6 @@ static_assert(!std::is_constructible<gsl::span<int, 3>, std::array<int, 500>&>::
"!std::is_constructible<gsl::span<int, 3>, std::array<int, 500>&>");
static_assert(!std::is_constructible<gsl::span<int, 3>, const std::array<int, 3>&>::value,
"!std::is_constructible<gsl::span<int, 3>, const std::array<int, 3>&>");
static_assert(!std::is_constructible<gsl::span<int, 3>, const gsl::span<int>&>::value,
"!std::is_constructible<gsl::span<int, 3>, const gsl::span<int>&>");
static_assert(!std::is_constructible<gsl::span<int, 3>, const gsl::span<int, 500>&>::value,
"!std::is_constructible<gsl::span<int, 3>, const gsl::span<int, 500>&>");
static_assert(!std::is_constructible<gsl::span<int, 3>, const gsl::span<const int>&>::value,
@ -866,12 +864,8 @@ static_assert(!std::is_constructible<gsl::span<const int>, std::array<double, 3>
static_assert(!std::is_constructible<gsl::span<const int>, const gsl::span<double, 3>&>::value,
"!std::is_constructible<gsl::span<const int>, const gsl::span<double, 3>&>");
static_assert(!std::is_constructible<gsl::span<const int, 3>, const gsl::span<int>&>::value,
"!std::is_constructible<gsl::span<const int, 3>, const gsl::span<int>&>");
static_assert(!std::is_constructible<gsl::span<const int, 3>, const gsl::span<int, 500>&>::value,
"!std::is_constructible<gsl::span<const int, 3>, const gsl::span<int, 500>&>");
static_assert(!std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int>&>::value,
"!std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int>&>");
static_assert(
!std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int, 500>&>::value,
"!std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int, 500>&>");
@ -925,6 +919,14 @@ static_assert(!std::is_constructible<gsl::span<const Derived>, std::array<Base,
static_assert(!std::is_constructible<gsl::span<const Derived>, const std::array<Base, 3>&>::value,
"!std::is_constructible<gsl::span<const Derived>, const std::array<Base, 3>&>");
// Explicit construction enabled in P1976R2
static_assert(std::is_constructible<gsl::span<int, 3>, const gsl::span<int>&>::value,
"std::is_constructible<gsl::span<int, 3>, const gsl::span<int>&>");
static_assert(std::is_constructible<gsl::span<const int, 3>, const gsl::span<int>&>::value,
"std::is_constructible<gsl::span<const int, 3>, const gsl::span<int>&>");
static_assert(std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int>&>::value,
"std::is_constructible<gsl::span<const int, 3>, const gsl::span<const int>&>");
// no throw copy constructor
static_assert(std::is_nothrow_copy_constructible<gsl::span<int>>::value,
"std::is_nothrow_copy_constructible<gsl::span<int>>");

2
tests/span_ext_tests.cpp
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@ -320,7 +320,7 @@ TEST(span_ext_test, make_span_from_array_constructor)
{
int arr[] = {1, 2, 3};
span<int> s1 = {&arr[0], 2}; // shorter
span<int> s1 = span<int>(&arr[0], 2); // shorter
span<int> s2 = arr; // longer
EXPECT_TRUE(s1 != s2);

6
tests/span_tests.cpp
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@ -157,7 +157,7 @@ TEST(span_test, from_pointer_length_constructor)
for (int i = 0; i < 4; ++i)
{
{
span<int> s = {&arr[0], narrow_cast<std::size_t>(i)};
span<int> s = span<int>(&arr[0], narrow_cast<std::size_t>(i));
EXPECT_TRUE(s.size() == narrow_cast<std::size_t>(i));
EXPECT_TRUE(s.data() == &arr[0]);
EXPECT_TRUE(s.empty() == (i == 0));
@ -165,7 +165,7 @@ TEST(span_test, from_pointer_length_constructor)
EXPECT_TRUE(arr[j] == s[narrow_cast<std::size_t>(j)]);
}
{
span<int> s = {&arr[i], 4 - narrow_cast<std::size_t>(i)};
span<int> s = span<int>(&arr[i], 4 - narrow_cast<std::size_t>(i));
EXPECT_TRUE(s.size() == 4 - narrow_cast<std::size_t>(i));
EXPECT_TRUE(s.data() == &arr[i]);
EXPECT_TRUE(s.empty() == ((4 - i) == 0));
@ -678,7 +678,7 @@ TEST(span_test, from_array_constructor)
s2 = s1;
EXPECT_TRUE(s2.empty());
auto get_temp_span = [&]() -> span<int> { return {&arr[1], 2}; };
auto get_temp_span = [&]() -> span<int> { return span<int>(&arr[1], 2); };
auto use_span = [&](span<const int> s) {
EXPECT_TRUE(s.size() == 2);
EXPECT_TRUE(s.data() == &arr[1]);

2435
tests/string_span_tests.cpp
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