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view: add write consuming operations

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This commit is contained in:
Danny Robson 2021-11-12 13:49:56 +10:00
parent 37b48341bb
commit 56828688b5
1 changed files with 50 additions and 0 deletions
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50
view.hpp
View File

@ -806,6 +806,8 @@ namespace cruft {
///
/// in contrast to 'extract' this will always copy the bytes out from the
/// view, making the operation alignment safe.
///
/// It is safe to use this on untrusted input.
template <
typename ValueT,
typename WordT,
@ -828,6 +830,54 @@ namespace cruft {
}
///////////////////////////////////////////////////////////////////////////
template <
typename ValueT,
typename WordT,
typename = std::enable_if_t<sizeof (ValueT) % sizeof (WordT) == 0>
>
view<WordT*>
write [[nodiscard]] (view<WordT*> const &dst, ValueT const &src)
{
static_assert (std::is_trivially_copyable_v<ValueT>);
if (unlikely (sizeof (ValueT) > dst.size () * sizeof (WordT)))
throw std::runtime_error ("insufficient data for extraction");
memcpy (dst.data (), &src, sizeof (ValueT));
return {
dst.begin () + sizeof (ValueT) / sizeof (WordT),
dst.end (),
};
}
template <
typename ValueT,
typename WordT,
typename = std::enable_if_t<sizeof (ValueT) % sizeof (WordT) == 0>
>
view<WordT*>
write [[nodiscard]] (view<WordT*> const &dst, cruft::view<ValueT const*> src)
{
static_assert (std::is_trivially_copyable_v<ValueT>);
if (unlikely (src.size () * sizeof (ValueT) > dst.size () * sizeof (WordT)))
throw std::runtime_error ("insufficient data for extraction");
memcpy (
dst.data (),
src.data (),
src.size () * sizeof (ValueT)
);
return {
dst.begin () + (sizeof (ValueT) / sizeof (WordT)) * src.size (),
dst.end (),
};
}
///////////////////////////////////////////////////////////////////////////
/// Tests whether an iterator falls within a given view.
template <typename IteratorT>