TheCloud/libSDL2pp
1
0
Fork 0
mirror of https://github.com/libSDL2pp/libSDL2pp.git synced 2025-08-03 19:05:59 -04:00
Code Issues Packages Projects Releases Wiki Activity

Added And operation for template metaprogramming

Browse Source
This commit is contained in:
Vraiment 2017-07-30 12:43:49 -07:00
parent 8489103f6a
commit 315d032b3b
1 changed files with 29 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
SDL2pp/Private/Utility.hh
View File

@ -64,6 +64,35 @@ namespace Private {
template <typename T, typename... Tx> template <typename T, typename... Tx>
using Or = typename OrOperation<T, Tx...>::type; using Or = typename OrOperation<T, Tx...>::type;
#endif #endif
/*
* Templated class to perform an "AND" operation on any amount of types.
*
* Usage is as follows:
* template <typename T,
* typename = typename And<HasFeatureOne<T>, HasFeatureTwo<T>>
* void UseFeatureOneAndFeatureTwo(T t) {
* // The code will be only compiled if both
* // HasFeatureOne<T> and HasFeatureTwo<T> are type_true
* }
*/
#if __cplusplus >= 201703L
// Use the standard definitions if they are available
template <typename T, typename... Tx>
using And = typename std::conjunction<T, Tx...>::type;
#else
template <typename...>
struct AndOperation : std::true_type { };
template <typename T>
struct AndOperation<T> : T { };
template <typename T, typename... Tx>
struct AndOperation<T, Tx...> : std::conditional<bool(T::value), AndOperation<Tx...>, T> { };
template <typename T, typename... Tx>
using And = typename AndOperation<T, Tx...>::type;
#endif
} }
} }