diff options
Diffstat (limited to 'lib/sorting.hpp')
| -rw-r--r-- | lib/sorting.hpp | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/sorting.hpp b/lib/sorting.hpp index 6b9be6a..0604aaf 100644 --- a/lib/sorting.hpp +++ b/lib/sorting.hpp @@ -1,5 +1,7 @@ #pragma once +#include <type_traits> + template<typename T> struct PtrSorter { bool operator()(const T & a, const T & b) const @@ -7,3 +9,22 @@ template<typename T> struct PtrSorter { return *a < *b; } }; + +template<typename T, auto M> struct PtrMemberSorter : public PtrSorter<T> { + using MT = std::decay_t<decltype((*T {}).*M)>; + using is_transparent = MT; + + using PtrSorter<T>::operator(); + + bool + operator()(const MT & a, const T & b) const + { + return a < (*b).*M; + } + + bool + operator()(const T & a, const MT & b) const + { + return (*a).*M < b; + } +}; |