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upd: [imp] span improved

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mutouyun 2022-10-29 15:47:12 +08:00
parent 595c1e4112
commit a0271041ee
1 changed files with 24 additions and 0 deletions
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24
include/libimp/span.h
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@ -10,6 +10,9 @@
#include <cstddef>
#include <iterator>
#include <array>
#include <limits>
#include <algorithm>
#include <cstdint>
#ifdef LIBIMP_CPP_20
#include <span>
#endif // LIBIMP_CPP_20
@ -182,6 +185,27 @@ public:
constexpr reverse_iterator rend() const noexcept {
return reverse_iterator(this->begin());
}
constexpr span<element_type> first(size_type count) const noexcept {
return span(begin(), count);
}
constexpr span<element_type> last(size_type count) const noexcept {
return span(end() - count, count);
}
constexpr span<element_type> subspan(size_type offset, size_type count = (std::numeric_limits<size_type>::max)()) const noexcept {
if (offset >= size()) {
return {};
}
return span(begin() + offset, (std::min)(size() - offset, count));
}
};
template <typename T,
typename Byte = typename std::conditional<std::is_const<T>::value, std::uint8_t const, std::uint8_t>::type>
auto as_bytes(span<T> s) noexcept -> span<Byte> {
return {reinterpret_cast<Byte *>(s.data()), s.size_bytes()};
}
LIBIMP_NAMESPACE_END_