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ircd: Add template option to skip runtime conditional in byte_view conversion.

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This commit is contained in:
Jason Volk 2020-09-16 21:30:13 -07:00
parent bd3d34adb2
commit a9c37908ec
1 changed files with 22 additions and 10 deletions
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32
include/ircd/byte_view.h
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@ -13,7 +13,10 @@
namespace ircd
{
template<class T = string_view> struct byte_view;
template<class T = string_view,
bool safety = true>
struct byte_view;
template<> struct byte_view<string_view>;
}
@ -39,19 +42,13 @@ struct ircd::byte_view<ircd::string_view>
};
/// string_view -> bytes
template<class T>
template<class T,
bool safety>
struct ircd::byte_view
{
string_view s;
operator const T &() const
{
assert(sizeof(T) <= size(s));
if(unlikely(sizeof(T) > s.size()))
throw std::bad_cast();
return *reinterpret_cast<const T *>(s.data());
}
operator const T &() const;
byte_view(const string_view &s = {})
:s{s}
@ -62,3 +59,18 @@ struct ircd::byte_view
:s{byte_view<string_view>{t}}
{}
};
template<class T,
bool safety>
inline ircd::byte_view<T, safety>::operator
const T &()
const
{
assert(sizeof(T) <= size(s));
if constexpr(safety)
if(unlikely(sizeof(T) > s.size()))
throw std::bad_cast();
return *reinterpret_cast<const T *>(s.data());
}