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#pragma once
#include <functional>
#include <glm/fwd.hpp>
#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;
}
};
template<auto Proj> struct SortedBy {
auto
operator()(const auto & left, const auto & right) const
{
return (std::invoke(Proj, left) < std::invoke(Proj, right));
}
};
struct CompareBy {
glm::length_t index;
template<typename T>
auto
operator()(const T & a, const T & b) const
{
return get(a) < get(b);
}
template<typename T>
auto
get(const T & a) const
{
return a[index];
}
};
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