include/marnav/utils/bitset_string.hpp

   1 #ifndef MARNAV_UTILS_BITSET_STRING_HPP
   2 #define MARNAV_UTILS_BITSET_STRING_HPP
   3
   4 /// Copyright (c) 2016 Mario Konrad <mario.konrad@gmx.net>
   5 /// The code is licensed under the BSD License.
   6
   7 #include "bitset.hpp"
   8 #include <string>
   9
  10 namespace marnav
  11 {
  12 namespace utils
  13 {
  14 /// Renders the bitset as string.
  15 ///
  16 /// @param[in] bits The bits to render.
  17 /// @return String representing the bitset as continous stream of '0' and '1'.
  18 template <class T> std::string to_string(const bitset<T> & bits)
  19 {
  20         std::string result;
  21         result.reserve(bits.size());
  22         for (auto const & b : bits)
  23                 result += '0' + b;
  24         return result;
  25 }
  26
  27 /// Renders the bitset as string, packed by specified number of bits.
  28 ///
  29 /// @param[in] bits The bits to render.
  30 /// @param[in] pack Number of bits per pack.
  31 /// @param[in] delm Delimitter to separate the packs.
  32 /// @return String representing the bitset as stream of '0' and '1', separated by
  33 ///   the delimitter.
  34 template <class T>
  35 std::string to_string(const bitset<T> & bits, std::size_t pack, char delm = ' ')
  36 {
  37         if ((pack == 0) || (pack >= bits.size()))
  38                 return to_string(bits);
  39
  40         std::string result;
  41
  42         // reserve space, wasted space at most: sizeof(delm) characters
  43         result.reserve(bits.size() + sizeof(delm) * (bits.size() / pack));
  44
  45         std::size_t i = 1;
  46         auto begin = bits.begin();
  47         for (;;) {
  48                 result += '0' + *begin;
  49                 ++begin;
  50                 if (begin == bits.end())
  51                         break;
  52                 if (i == pack) {
  53                         result += delm;
  54                         i = 0;
  55                 }
  56                 ++i;
  57         }
  58
  59         return result;
  60 }
  61 }
  62 }
  63
  64 #endif