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format_si_iec_units.cpp
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1 /*******************************************************************************
2  * tlx/string/format_si_iec_units.cpp
3  *
4  * Part of tlx - http://panthema.net/tlx
5  *
6  * Copyright (C) 2016-2017 Timo Bingmann <[email protected]>
7  *
8  * All rights reserved. Published under the Boost Software License, Version 1.0
9  ******************************************************************************/
10 
12 
13 #include <iomanip>
14 #include <sstream>
15 
16 namespace tlx {
17 
18 //! Format number as something like 1 TB
19 std::string format_si_units(uint64_t number, int precision) {
20  // may not overflow, std::numeric_limits<uint64_t>::max() == 16 EiB
21  double multiplier = 1000.0;
22  static const char* SI_endings[] = {
23  "", "k", "M", "G", "T", "P", "E"
24  };
25  unsigned int scale = 0;
26  double number_d = static_cast<double>(number);
27  while (number_d >= multiplier) {
28  number_d /= multiplier;
29  ++scale;
30  }
31  std::ostringstream out;
32  out << std::fixed << std::setprecision(precision) << number_d
33  << ' ' << SI_endings[scale];
34  return out.str();
35 }
36 
37 //! Format number as something like 1 TiB
38 std::string format_iec_units(uint64_t number, int precision) {
39  // may not overflow, std::numeric_limits<uint64_t>::max() == 16 EiB
40  double multiplier = 1024.0;
41  static const char* IEC_endings[] = {
42  "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei"
43  };
44  unsigned int scale = 0;
45  double number_d = static_cast<double>(number);
46  while (number_d >= multiplier) {
47  number_d /= multiplier;
48  ++scale;
49  }
50  std::ostringstream out;
51  out << std::fixed << std::setprecision(precision) << number_d
52  << ' ' << IEC_endings[scale];
53  return out.str();
54 }
55 
56 } // namespace tlx
57 
58 /******************************************************************************/
std::string format_si_units(uint64_t number, int precision)
Format number as something like 1 TB.
std::basic_string< char, std::char_traits< char >, Allocator< char > > string
string with Manager tracking
Definition: allocator.hpp:220
std::string format_iec_units(uint64_t number, int precision)
Format number as something like 1 TiB.