[add] Added ElementProgramSet.

sjplayer/src/sjplayer/ElementProgramSet.d

@@ -0,0 +1,36 @@
+/// License: MIT
+module sjplayer.ElementProgramSet;
+
+import std.meta,
+       std.typecons;
+
+import sjplayer.CircleElement;
+
+///
+class ElementProgramSet {
+ public:
+  ///
+  alias ElementPrograms = Tuple!(CircleElementProgram);
+
+  ///
+  this() {
+    foreach (ref program; programs_) {
+      program = new typeof(program);
+    }
+  }
+  ~this() {
+    foreach (program; programs_) {
+      program.destroy();
+    }
+  }
+
+  ///
+  T Get(T)() out (r; r) {
+    enum index = staticIndexOf!(T, ElementPrograms.Types);
+    static assert(index >= 0);
+    return programs_[index];
+  }
+
+ private:
+  ElementPrograms programs_;
+}

sjplayer/standalone/main.d

@@ -20,12 +20,14 @@ int main(string[] args) {
   scope(exit) sfMusic_destroy(music);
   sfMusic_play(music);
 
+  import sjplayer.ElementProgramSet;
+  auto programs = new ElementProgramSet;
+  scope(exit) programs.destroy();
+
   import sjplayer.CircleElement;
-  auto program = new CircleElementProgram;
-  scope(exit) program.destroy();
   auto element = new CircleElement;
   scope(exit) element.destroy();
-  auto drawer  = new CircleElementDrawer(program, [element]);
+  auto drawer  = new CircleElementDrawer(programs.Get!CircleElementProgram, [element]);
   scope(exit) drawer.destroy();
 
   with (element) {