nerdcruft/libcruft-util
1
0
Fork 0
Code Issues Releases Activity

view: allow multibyte casts in make_byte_view

Browse Source
This commit is contained in:
Danny Robson 2018-12-17 14:45:09 +11:00
parent cc2d11f102
commit 60bd71a57b
1 changed files with 12 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
view.hpp
View File

@ -576,32 +576,31 @@ namespace cruft {
///////////////////////////////////////////////////////////////////////////
// calculates a byte oriented view over an arbitrary type
//
// useful for passing in memory structures to file descriptors and the
// like. but the consequences of endian conversion is on the user...
//
// we have to be careful that rval-references and other temporaries aren't
// accepted in this signature.
/// Calculates a word oriented view over an arbitrary type
///
/// Useful for passing in memory structures to file descriptors and the
/// like. but the consequences of endian conversion is on the user...
///
/// We have to be careful that rval-references and other temporaries aren't
/// accepted in this signature.
template <
typename ByteT = std::byte,
typename WordT = std::byte,
typename T
>
auto
make_byte_view (T &t)
{
static_assert (std::is_integral_v<ByteT>);
static_assert (sizeof (T) % sizeof (ByteT) == 0);
static_assert (sizeof (T) % sizeof (WordT) == 0);
using cursor_type = std::conditional_t<
std::is_const_v<T>,
ByteT const*,
ByteT*
WordT const*,
WordT*
>;
return view {
cast::alignment<cursor_type> (&t),
sizeof (T) / sizeof (ByteT)
sizeof (T) / sizeof (WordT)
};
}