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#pragma once
#include <type_traits>
template<typename T> struct PtrSorter {
bool
operator()(const T & a, const T & b) const
{
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;
}
};
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