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//----------------------------------------------------------------------------
/// @file test_sample_sort.cpp
/// @brief test sample_sort algorithm
///
/// @author Copyright (c) 2016 Francisco Jose Tapia (fjtapia@gmail.com )\n
/// Distributed under the Boost Software License, Version 1.0.\n
/// ( See accompanying file LICENSE_1_0.txt or copy at
/// http://www.boost.org/LICENSE_1_0.txt )
/// @version 0.1
///
/// @remarks
//-----------------------------------------------------------------------------
#include <ciso646>
#include <cstdlib>
#include <ctime>
#include <algorithm>
#include <vector>
#include <random>
#include <boost/sort/sample_sort/sample_sort.hpp>
#include <boost/test/included/test_exec_monitor.hpp>
#include <boost/test/test_tools.hpp>
namespace bss = boost::sort;
struct xk
{
unsigned tail : 4;
unsigned num : 28;
xk ( uint32_t n =0 , uint32_t t =0): tail (t), num(n){};
bool operator< (xk A) const { return (num < A.num); };
};
void test1()
{
std::mt19937_64 my_rand(0);
const uint32_t NMAX = 100000;
std::vector<xk> V1, V2, V3;
V1.reserve(NMAX);
for (uint32_t i = 0; i < 8; ++i)
{
for (uint32_t k = 0; k < NMAX; ++k)
{ uint32_t NM = my_rand();
xk G;
G.num = NM >> 3;
G.tail = i;
V1.push_back(G);
};
};
V3 = V2 = V1;
bss::sample_sort(V1.begin(), V1.end());
std::stable_sort(V2.begin(), V2.end());
bss::sample_sort(V3.begin(), V3.end(), 0);
BOOST_CHECK(V1.size() == V2.size());
for (uint32_t i = 0; i < V1.size(); ++i)
{ BOOST_CHECK(V1[i].num == V2[i].num and V1[i].tail == V2[i].tail);
};
BOOST_CHECK(V3.size() == V2.size());
for (uint32_t i = 0; i < V3.size(); ++i)
{ BOOST_CHECK(V3[i].num == V2[i].num and V3[i].tail == V2[i].tail);
};
};
void test2(void)
{
const uint32_t NElem = 2000000;
std::vector<uint64_t> V1;
// ----------------- sorted elements ------------------------------------
V1.clear();
for (uint32_t i = 0; i < NElem; ++i) V1.push_back(i);
bss::sample_sort(V1.begin(), V1.end());
for (unsigned i = 1; i < NElem; i++)
{ BOOST_CHECK(V1[i - 1] <= V1[i]);
};
// ------------- reverse sorted elements --------------------------------
V1.clear();
for (uint32_t i = 0; i < NElem; ++i) V1.push_back(NElem - i);
bss::sample_sort(V1.begin(), V1.end());
for (unsigned i = 1; i < NElem; i++)
{ BOOST_CHECK(V1[i - 1] <= V1[i]);
};
// -------------------- equals elements -----------------------------------
V1.clear();
for (uint32_t i = 0; i < NElem; ++i) V1.push_back(1000);
bss::sample_sort(V1.begin(), V1.end());
for (unsigned i = 1; i < NElem; i++)
{ BOOST_CHECK(V1[i - 1] == V1[i]);
};
};
void test3(void)
{
typedef std::less<uint64_t> compare;
const uint32_t NElem = 2000000;
std::vector<uint64_t> V1,V2,V3;
std::mt19937_64 my_rand(0);
for (uint32_t i = 0; i < NElem; ++i) V1.push_back(my_rand() % NElem);
V3 = V2 = V1;
std::stable_sort (V2.begin(), V2.end());
// --------------- unsorted elements 0 threads ----------------------------
V3 = V1;
bss::sample_sort(V3.begin(), V3.end(), compare(), 0);
for (unsigned i = 0; i < NElem; i++)
{ BOOST_CHECK(V3[i] == V2[i]);
};
// --------------- unsorted elements -------------------------------------
V3 = V1;
bss::sample_sort(V3.begin(), V3.end(), compare());
for (unsigned i = 0; i < NElem; i++)
{ BOOST_CHECK(V3[i] == V2[i]);
};
// --------------- unsorted elements 100 threads ----------------------------
V3 = V1;
bss::sample_sort(V3.begin(), V3.end(), compare(), 100);
for (unsigned i = 0; i < NElem; i++)
{ BOOST_CHECK(V3[i] == V2[i]);
};
};
void test4(void)
{
const uint32_t KMax = 66000;
std::vector<uint64_t> K, M;
std::mt19937_64 my_rand(0);
for (uint32_t i = 0; i < KMax; ++i)
K.push_back(my_rand());
M = K;
bss::sample_sort(K.begin(), K.end(), 300);
std::stable_sort(M.begin(), M.end());
for (unsigned i = 0; i < KMax; i++)
BOOST_CHECK(M[i] == K[i]);
};
void test5 (void)
{
typedef typename std::vector<xk>::iterator iter_t;
std::mt19937 my_rand (0);
std::vector<xk> V ;
const uint32_t NELEM = 100000;
V.reserve(NELEM * 10);
for (uint32_t k =0 ; k < 10 ; ++k)
{ for ( uint32_t i =0 ; i < NELEM ; ++i)
{ V.emplace_back(i , k);
};
iter_t first = V.begin() + (k * NELEM);
iter_t last = first + NELEM ;
std::shuffle( first, last, my_rand);
};
bss::sample_sort( V.begin() , V.end());
for ( uint32_t i =0 ; i < ( NELEM * 10); ++i)
{ BOOST_CHECK ( V[i].num == (i / 10) and V[i].tail == (i %10) );
};
}
int test_main(int, char *[])
{
test1();
test2();
test3();
test4();
test5();
return 0;
};
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