Random::iterator<T> skel

Fortune for cpprng's current commit: Half blessing − 半吉

include/rng.h

@@ -34,6 +34,7 @@ struct InvalidRandomSample final : public std::exception {
 	
 	const f64 value;
 };
+struct ObjectMoved final : public std::exception{};
 
 /// Interface for a simple random number generator
 ///
@@ -48,7 +49,26 @@ struct InvalidRandomSample final : public std::exception {
 struct Random
 {
 	template<typename T>
-	struct iterator; //TODO: Implement this in another file (has to be header because of template :/)
+	struct iterator { //TODO: Implement this in another file (has to be header because of template :/)
+		friend class Random;
+
+		//TODO: Make this work with foreach(), and STL iterator APIs somehow
+
+		inline CTOR_COPY(iterator<T>) : rng(copy.rng){}
+		inline CTOR_MOVE(iterator<T>) : rng(move.rng) {
+			*const_cast<Random**>(&move.rng) = nullptr;
+		}
+
+		inline virtual ~iterator(){}
+
+	protected:
+		virtual T _sample() { if (rng) return rng->next<T>(); else throw ObjectMoved(); }
+		virtual inline void _init() {}
+	private:
+		inline explicit iterator(Random& rng) : rng(&rng){ _init(); }
+
+		Random* const rng;
+	};
 
 	constexpr inline Random(){}
 	constexpr inline virtual ~Random(){}
@@ -129,7 +149,7 @@ struct Random
 		return std::bit_cast<T>(arr);
 	}
 	template<typename T>
-	inline iterator<T> iter(); //TODO: An iterator that yields `next<T>()` forever.
+	inline iterator<T> iter() { return iterator(*this); }  //TODO: An iterator that yields `next<T>()` forever.
 protected:
 	//constexpr inline virtual i8 _max() const { return 100; } // use limits.h stuff instead.