Reduce compile-time complexity of combined_dispatch_prototype::overload_types #60
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Due to the design of
overloads_combination_traits
, the compile-time complexity to deducecombined_dispatch_prototype::overload_types
is about O(n^3), which can theoretically be reduced to O(n^2) beforestd::meta
(hopefully) in C++26. In this change,flattening_traits
was split into two,recursive_reduction
andflat_reduction
.recursive_reduction
is subsequently used in the definition ofcombined_dispatch_prototype::overload_types
.No functional changes.