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util/SpanCast: add const support to FromBytesFloor()

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This commit is contained in:
Max Kellermann 2022-06-01 21:40:13 +02:00
parent 04041f9583
commit bd96f6e572
1 changed files with 4 additions and 1 deletions
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5
src/util/SpanCast.hxx
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@ -33,13 +33,16 @@
#include <span> #include <span>
#include <string_view> #include <string_view>
template<typename From, typename To>
using CopyConst = std::conditional_t<std::is_const_v<From>, const To, To>;
/** /**
* Cast a std::span<std::byte> to a std::span<T>, rounding down to the * Cast a std::span<std::byte> to a std::span<T>, rounding down to the
* next multiple of T's size. * next multiple of T's size.
*/ */
template<typename T> template<typename T>
constexpr std::span<T> constexpr std::span<T>
FromBytesFloor(std::span<std::byte> other) noexcept FromBytesFloor(std::span<CopyConst<T, std::byte>> other) noexcept
{ {
static_assert(sizeof(T) > 0, "Empty base type"); static_assert(sizeof(T) > 0, "Empty base type");