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Import sketch for a potential range dispatcher.

This commit is contained in:
Thomas Harte 2023-06-10 15:58:30 -04:00
parent c0547f6e14
commit 8a831b1409

View File

@ -93,3 +93,46 @@ private:
} }
#endif /* Dispatcher_hpp */ #endif /* Dispatcher_hpp */
/*
template <typename ClassifierT, int x> constexpr int lower_bound() {
if constexpr (!x || ClassifierT::template type<x>() != ClassifierT::template type<x-1>()) {
return x;
} else {
return lower_bound<ClassifierT, x - 1>();
}
}
template <typename ClassifierT, typename TargetT>
void range_dispatch(TargetT &destination, int start, int end) {
#define case(x) case x: \
if constexpr (x+1 == ClassifierT::max || ClassifierT::template type<x+1>() != ClassifierT::template type<x>()) { \
const auto range_begin = std::max(start, lower_bound<ClassifierT, x>()); \
const auto range_end = std::min(end, x + 1); \
\
if(range_begin == lower_bound<ClassifierT, x>()) {\
destination.template begin<ClassifierT::template type<x>()>(range_begin); \
}\
destination.template perform<ClassifierT::template type<x>()>(range_begin, range_end); \
if(range_end == x+1) {\
destination.template end<ClassifierT::template type<x>()>(range_begin); \
}\
if(x+1 >= end) { \
break; \
} \
} \
[[fallthrough]];
switch(start) {
case(0)
case(1)
case(2)
case(3)
case(4)
case(5)
}
#undef case
}
*/