// Copyright (c) 2017-2024, The Monero Project
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// Most of this file is originally copyright (c) 2017 Raymond Chen, Microsoft
// This algorithm is adapted from Raymond Chen's code:
// https://blogs.msdn.microsoft.com/oldnewthing/20170109-00/?p=95145
#pragma once
#include <vector>
#include <functional>
#include "misc_log_ex.h"
namespace tools
{
template<typename F>
void apply_permutation(std::vector<size_t> permutation, const F &swap)
{
//sanity check
for (size_t n = 0; n < permutation.size(); ++n)
CHECK_AND_ASSERT_THROW_MES(std::find(permutation.begin(), permutation.end(), n) != permutation.end(), "Bad permutation");
for (size_t i = 0; i < permutation.size(); ++i)
{
size_t current = i;
while (i != permutation[current])
{
size_t next = permutation[current];
swap(current, next);
permutation[current] = current;
current = next;
}
permutation[current] = current;
}
}
template<typename T>
void apply_permutation(const std::vector<size_t> &permutation, std::vector<T> &v)
{
CHECK_AND_ASSERT_THROW_MES(permutation.size() == v.size(), "Mismatched vector sizes");
apply_permutation(permutation, [&v](size_t i0, size_t i1){ std::swap(v[i0], v[i1]); });
}
}
