src/marnav/nmea/wcv.cpp

   1 #include <marnav/nmea/wcv.hpp>
   2 #include <marnav/nmea/io.hpp>
   3 #include "checks.hpp"
   4
   5 namespace marnav
   6 {
   7 namespace nmea
   8 {
   9 constexpr sentence_id wcv::ID;
  10 constexpr const char * wcv::TAG;
  11
  12 wcv::wcv()
  13         : sentence(ID, TAG, talker::global_positioning_system)
  14 {
  15 }
  16
  17 wcv::wcv(talker talk, fields::const_iterator first, fields::const_iterator last)
  18         : sentence(ID, TAG, talk)
  19 {
  20         if (std::distance(first, last) != 3)
  21                 throw std::invalid_argument{"invalid number of fields in wcv"};
  22
  23         utils::optional<unit::velocity> speed_unit;
  24
  25         read(*(first + 0), speed_);
  26         read(*(first + 1), speed_unit);
  27         read(*(first + 2), waypoint_id_);
  28
  29         check_value(speed_unit, {unit::velocity::knot}, "speed unit");
  30 }
  31
  32 void wcv::set_speed(units::velocity t) noexcept
  33 {
  34         speed_ = t.get<units::knots>();
  35 }
  36
  37 utils::optional<units::velocity> wcv::get_speed() const
  38 {
  39         if (!speed_)
  40                 return {};
  41         return {*speed_};
  42 }
  43
  44 void wcv::append_data_to(std::string & s) const
  45 {
  46         append(s, format(speed_, 1));
  47         append(s, to_string_if(unit::velocity::knot, speed_));
  48         append(s, to_string(waypoint_id_));
  49 }
  50 }
  51 }