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constexpr function

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This commit is contained in:
Joachim Schoeberl 2021-06-28 01:35:23 +02:00
parent 91506aa71a
commit fd50131a5b
1 changed files with 18 additions and 11 deletions
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29
libsrc/core/archive.hpp
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@ -94,6 +94,17 @@ namespace ngcore
template<typename T> template<typename T>
constexpr bool is_archivable = detail::is_Archivable_struct<T>::value; constexpr bool is_archivable = detail::is_Archivable_struct<T>::value;
template <typename T, typename ... Trest>
constexpr size_t TotSize ()
{
if constexpr (sizeof...(Trest) == 0)
return sizeof(T);
else
return sizeof(T) + TotSize<Trest...> ();
}
// Base Archive class // Base Archive class
class NGCORE_API Archive class NGCORE_API Archive
{ {
@ -308,22 +319,25 @@ namespace ngcore
val.DoArchive(*this); return *this; val.DoArchive(*this); return *this;
} }
// pack elements to binary // pack elements to binary
template <typename ... Types> template <typename ... Types>
Archive & DoPacked (Types & ... args) Archive & DoPacked (Types & ... args)
{ {
if (true) // (isbinary) if (true) // (isbinary)
{ {
constexpr size_t totsize = TotSize<Types...>(); // (args...);
std::byte mem[totsize];
if (is_output) if (is_output)
{ {
std::byte mem[TotSize(args...)];
CopyToBin (&mem[0], args...); CopyToBin (&mem[0], args...);
Do(&mem[0], sizeof(mem)); Do(&mem[0], totsize);
} }
else else
{ {
std::byte mem[TotSize(args...)]; Do(&mem[0], totsize);
Do(&mem[0], sizeof(mem));
CopyFromBin (&mem[0], args...); CopyFromBin (&mem[0], args...);
} }
} }
@ -332,13 +346,6 @@ namespace ngcore
return *this; return *this;
} }
template <typename T, typename ... Trest>
static constexpr size_t TotSize (T & first, Trest & ...rest)
{
return sizeof(first) + TotSize(rest...);
}
static constexpr size_t TotSize () { return 0; }
template <typename T, typename ... Trest> template <typename T, typename ... Trest>
constexpr void CopyToBin (std::byte * ptr, T & first, Trest & ...rest) const constexpr void CopyToBin (std::byte * ptr, T & first, Trest & ...rest) const