libs/sort/example/int64.cpp
// spreadsort 64-bit integer sorting example.
//
// Copyright Steven Ross 2009-2014.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/sort for library home page.
#include <boost/sort/spreadsort/spreadsort.hpp>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <vector>
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
using namespace boost::sort::spreadsort;
//[int64bit_1
#define DATA_TYPE boost::int64_t
//] [/int64bit_1]
//Pass in an argument to test std::sort
int main(int argc, const char ** argv) {
size_t uCount,uSize=sizeof(DATA_TYPE);
bool stdSort = false;
unsigned loopCount = 1;
for (int u = 1; u < argc; ++u) {
if (std::string(argv[u]) == "-std")
stdSort = true;
else
loopCount = atoi(argv[u]);
}
std::ifstream input("input.txt", std::ios_base::in | std::ios_base::binary);
if (input.fail()) {
printf("input.txt could not be opened\n");
return 1;
}
double total = 0.0;
std::vector<DATA_TYPE> array;
input.seekg (0, std::ios_base::end);
size_t length = input.tellg();
uCount = length/uSize;
//Run multiple loops, if requested
for (unsigned u = 0; u < loopCount; ++u) {
input.seekg (0, std::ios_base::beg);
//Conversion to a vector
array.resize(uCount);
unsigned v = 0;
while (input.good() && v < uCount)
input.read(reinterpret_cast<char *>(&(array[v++])), uSize );
if (v < uCount)
array.resize(v);
clock_t start, end;
double elapsed;
start = clock();
if (stdSort)
//std::sort(&(array[0]), &(array[0]) + uCount);
std::sort(array.begin(), array.end());
else
//boost::sort::spreadsort::spreadsort(&(array[0]), &(array[0]) + uCount);
//[int64bit_2
boost::sort::spreadsort::spreadsort(array.begin(), array.end());
//] [/int64bit_2]
end = clock();
elapsed = static_cast<double>(end - start) ;
std::ofstream ofile;
if (stdSort)
ofile.open("standard_sort_out.txt", std::ios_base::out |
std::ios_base::binary | std::ios_base::trunc);
else
ofile.open("boost_sort_out.txt", std::ios_base::out |
std::ios_base::binary | std::ios_base::trunc);
if (ofile.good()) {
for (unsigned v = 0; v < array.size(); ++v) {
ofile.write(reinterpret_cast<char *>(&(array[v])), sizeof(array[v]) );
}
ofile.close();
}
total += elapsed;
array.clear();
}
input.close();
if (stdSort)
printf("std::sort elapsed time %f\n", total / CLOCKS_PER_SEC);
else
printf("spreadsort elapsed time %f\n", total / CLOCKS_PER_SEC);
return 0;
}