console_song3.cpp

Shows how to use xtd::beep class.

#include <xtd/xtd>
 
// Define the frequencies of notes in an octave, as well as silence (rest).
enum class tone {
  rest = 0,
  g_below_c = 196,
  a = 220,
  a_sharp = 233,
  b = 247,
  c = 262,
  c_sharp = 277,
  d = 294,
  d_sharp = 311,
  e = 330,
  f = 349,
  f_sharp = 370,
  g = 392,
  g_sharp = 415
};
 
// Define the duration of a note in units of milliseconds.
enum class duration {
  none = 0,
  whole = 1600,
  half = whole / 2,
  quarter = half / 2,
  eighth = quarter / 2,
  sixteenth = eighth / 2
};
 
// Define a note as a frequency (tone) and the amount of time (duration) the note plays.
using note = std::tuple<tone, duration>;
 
// Play the notes in a song.
auto play(auto&& tone, auto&& duration) {console::beep(as<uint32>(tone), as<uint32>(duration));}
auto play(auto&& note) {std::apply([](auto&&... args) {play(args...);}, note);}
auto play(auto&&... tune) {(play(tune), ...);}
 
auto main() -> int {
  // Declare the first few notes of the song, "Mary Had A Little Lamb" and play it
  play(note {tone::b, duration::quarter},
       note {tone::a, duration::quarter},
       note {tone::g_below_c, duration::quarter},
       note {tone::a, duration::quarter},
       note {tone::b, duration::quarter},
       note {tone::b, duration::quarter},
       note {tone::b, duration::half},
       note {tone::a, duration::quarter},
       note {tone::a, duration::quarter},
       note {tone::a, duration::half},
       note {tone::b, duration::quarter},
       note {tone::d, duration::quarter},
       note {tone::d, duration::half});
}