1// spreadsort reverse string sorting example.
2//
3// Copyright Steven Ross 2009-2014.
4//
5// Distributed under the Boost Software License, Version 1.0.
6// (See accompanying file LICENSE_1_0.txt or copy at
7// http://www.boost.org/LICENSE_1_0.txt)
8
9// See http://www.boost.org/libs/sort for library home page.
10
11#include <boost/sort/spreadsort/string_sort.hpp>
12#include <time.h>
13#include <stdio.h>
14#include <stdlib.h>
15#include <algorithm>
16#include <vector>
17#include <iostream>
18#include <fstream>
19#include <string>
20using std::string;
21using namespace boost::sort::spreadsort;
22
23#define DATA_TYPE string
24
25//Pass in an argument to test std::sort
26int main(int argc, const char ** argv) {
27 std::ifstream indata;
28 std::ofstream outfile;
29 bool stdSort = false;
30 unsigned loopCount = 1;
31 for (int u = 1; u < argc; ++u) {
32 if (std::string(argv[u]) == "-std")
33 stdSort = true;
34 else
35 loopCount = atoi(nptr: argv[u]);
36 }
37 double total = 0.0;
38 //Run multiple loops, if requested
39 std::vector<DATA_TYPE> array;
40 for (unsigned u = 0; u < loopCount; ++u) {
41 indata.open(s: "input.txt", mode: std::ios_base::in | std::ios_base::binary);
42 if (!indata) {
43 printf(format: "input.txt could not be opened\n");
44 return 1;
45 }
46 DATA_TYPE inval;
47 indata >> inval;
48 while (!indata.eof() ) {
49 //testing substrings
50 if (!(array.size() % 2))
51 inval = "prefix" + inval;
52 else
53 inval += "suffix";
54 array.push_back(x: inval);
55 //Inserting embedded nulls and empty strings
56 if (!(array.size() % 100)) {
57 if (inval.empty() || !(array.size() % 1000))
58 array.push_back(x: "");
59 else {
60 inval[0] = '\0';
61 array.push_back(x: inval);
62 }
63 }
64 indata >> inval;
65 }
66
67 indata.close();
68 clock_t start, end;
69 double elapsed;
70 start = clock();
71 if (stdSort)
72 //std::sort(&(array[0]), &(array[0]) + uCount);
73 std::sort(first: array.begin(), last: array.end(), comp: std::greater<string>());
74 else
75 //string_sort(&(array[0]), &(array[0]) + uCount);
76 reverse_string_sort(first: array.begin(), last: array.end(), comp: std::greater<string>());
77 end = clock();
78 elapsed = static_cast<double>(end - start);
79 if (stdSort)
80 outfile.open(s: "standard_sort_out.txt", mode: std::ios_base::out |
81 std::ios_base::binary | std::ios_base::trunc);
82 else
83 outfile.open(s: "boost_sort_out.txt", mode: std::ios_base::out |
84 std::ios_base::binary | std::ios_base::trunc);
85 if (outfile.good()) {
86 for (unsigned u = 0; u < array.size(); ++u)
87 outfile << array[u] << "\n";
88 outfile.close();
89 }
90 total += elapsed;
91 array.clear();
92 }
93 if (stdSort)
94 printf(format: "std::sort elapsed time %f\n", total / CLOCKS_PER_SEC);
95 else
96 printf(format: "spreadsort elapsed time %f\n", total / CLOCKS_PER_SEC);
97 return 0;
98}
99

source code of boost/libs/sort/example/reversestringsample.cpp