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More checks for non-compilable code, plus fix for span (#1180)

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Werner Henze 2025-01-04 18:50:31 +01:00 • committed by GitHub
parent c832885f15
commit 1cdb8d295e
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8 changed files with 439 additions and 412 deletions
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7
include/gsl/span
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@ -582,6 +582,8 @@ public:
template <std::size_t Count>
constexpr span<element_type, Count> first() const noexcept
{
static_assert(Extent == dynamic_extent || Count <= Extent,
"first() cannot extract more elements from a span than it contains.");
Expects(Count <= size());
return span<element_type, Count>{data(), Count};
}
@ -592,6 +594,8 @@ public:
// clang-format on
constexpr span<element_type, Count> last() const noexcept
{
static_assert(Extent == dynamic_extent || Count <= Extent,
"last() cannot extract more elements from a span than it contains.");
Expects(Count <= size());
return span<element_type, Count>{data() + (size() - Count), Count};
}
@ -603,6 +607,9 @@ public:
constexpr auto subspan() const noexcept ->
typename details::calculate_subspan_type<ElementType, Extent, Offset, Count>::type
{
static_assert(Extent == dynamic_extent || (Extent >= Offset && (Count == dynamic_extent ||
Count <= Extent - Offset)),
"subspan() cannot extract more elements from a span than it contains.");
Expects((size() >= Offset) && (Count == dynamic_extent || (Count <= size() - Offset)));
using type =
typename details::calculate_subspan_type<ElementType, Extent, Offset, Count>::type;