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74 lines
2.4 KiB
74 lines
2.4 KiB
#pragma once
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#include <gp/algorithms/move.hpp>
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#include <gp/algorithms/partition.hpp>
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namespace gp {
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namespace __details {
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template<typename it_t, typename pred>
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void selection_sort(it_t first, it_t last, pred predicate = pred{}) {
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while(first != last) {
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it_t traveler = first;
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it_t it = first;
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it++;
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for(;it!=last;it++) {
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if(predicate(*it, *traveler)) traveler = it;
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}
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gp::swap(*first, *traveler);
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first++;
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}
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}
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template<typename it_t, typename pred>
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bool sort2(auto it0, auto it1, pred predicate = pred{}){
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if(it0 != it1 && predicate(*it1, *it0)) {
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gp::swap(*it0, *it1);
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return true;
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}
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return false;
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};
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/*
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template<typename it_t, typename pred>
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void quick_sort(it_t first, it_t last, pred predicate = pred{}) {
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using __details::sort2;
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if(last - first <= 2) {
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auto nit = first + (size_t)(last == first + 1);
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__details::sort2<it_t>(first, nit, predicate);
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return;
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}
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auto pivot_v = *(first + (last - first)/2);
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auto pivot = gp::partition(first, last, [&](auto& a) -> bool{
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return predicate(a, pivot_v);
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});
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gp::__details::quick_sort(first, pivot, predicate);
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gp::__details::quick_sort(pivot, last, predicate);
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}
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*/
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template<typename it_t, typename pred>
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void bubble_sort(it_t first, it_t last, pred predicate = pred{}) {
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if(last - first <= 2) {
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auto nit = first + (size_t)(last == first + 1);
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__details::sort2<it_t>(first, nit, predicate);
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return;
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}
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size_t swaps;
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do {
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swaps = 0;
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auto it = first;
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auto nit = it + 1;
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for(;;) {
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swaps += __details::sort2<it_t>(it, nit, predicate);
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++it; ++nit;
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if(nit == last) break;
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}
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} while(swaps);
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}
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}
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template<typename it_t, typename pred>
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void sort(it_t first, it_t last, pred predicate = pred{}) {
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return gp::__details::selection_sort(first, last, predicate);
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}
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}
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