thesis version

inc/alsk/context/context.h

@@ -0,0 +1,90 @@
+#ifndef ALSK_ALSK_CONTEXT_CONTEXT_H
+#define ALSK_ALSK_CONTEXT_CONTEXT_H
+
+#include <functional>
+#include <tuple>
+#include <vector>
+
+#include <random>
+
+#include "../skeleton/link/args/placeholders.h"
+
+namespace alsk {
+
+template<typename RNG>
+class Context {
+public:
+	using Id    = std::size_t;
+
+	using Args  = std::tuple<Id, RNG&>;
+
+	using Seed  = decltype(+RNG::default_seed);
+
+private:
+	Id _idCount;
+
+	std::vector<RNG> _rng;
+	std::vector<Args> _args;
+
+public:
+	Seed seed;
+
+public:
+	constexpr Context(): _idCount{0}, seed{RNG::default_seed} {}
+
+	void setup(Id idCount = 30) {
+		if(idCount <= _idCount) return;
+		Id baseId = _idCount;
+		_idCount = idCount;
+
+		RNG seeder{seed};
+
+		_rng.reserve(idCount);
+		for(Id id = baseId; id < idCount; ++id)
+			_rng.emplace_back(seeder());
+
+		_args.reserve(idCount);
+		for(Id id = baseId; id < idCount; ++id)
+			_args.emplace_back(id, std::ref(_rng[id]));
+	}
+
+	void reset() {
+		RNG seeder{seed};
+
+		_rng.clear();
+		for(Id id = 0; id < _idCount; ++id)
+			_rng.emplace_back(seeder());
+
+		_args.clear();
+		for(Id id = 0; id < _idCount; ++id)
+			_args.emplace_back(id, std::ref(_rng[id]));
+	}
+
+	constexpr Id maxId() const noexcept { return _idCount; }
+
+	Args& args(Id const& id) { return _args[id]; }
+
+	~Context() noexcept {}
+};
+
+using DefaultContext = Context<std::mt19937>;
+
+namespace arg {
+
+/**
+ * CtxId
+ * to get own's context identifier
+ */
+using CtxId = C<0>;
+
+/**
+ * RNG
+ * for random number generator
+ */
+using RNG = C<1>;
+
+}
+
+}
+
+#endif