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ircd::util: Add binary_view utility.

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This commit is contained in:
Jason Volk 2017-08-30 14:19:50 -07:00
parent 19c5e6c83b
commit 4013c301e5
1 changed files with 37 additions and 7 deletions
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44
include/ircd/util.h
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@ -971,18 +971,48 @@ struct vector_view
};
//
// Convenience cast a type (ex. an integer) into a string_view
// Convenience cast a type (ex. an integer) into and out of a string_view
//
template<class T>
string_view
binary_view(const T &t)
template<class T = string_view>
struct binary_view
{
return
string_view s;
operator const T &() const
{
return *reinterpret_cast<const T *>(s.data());
}
binary_view(const string_view &s)
:s{s}
{
if(unlikely(sizeof(T) != s.size()))
throw std::bad_cast();
}
};
template<>
struct binary_view<string_view>
:string_view
{
template<class T>
binary_view(const T &t)
:string_view
{
reinterpret_cast<const char *>(&t), sizeof(T)
};
}
}
{}
};
// Convenience cast a type (ex. an integer) from a string_view
// ref is always const because string_view uses const char *
template<class R>
const R &
as(const string_view &s)
{
const binary_view<R> bv{s};
return static_cast<const R &>(bv);
}
//
// Error-checking closure for POSIX system calls. Note the usage is