make_RNG.cc
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make_RNG.cc
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	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include "HEJ/make_RNG.hh"

	#include <algorithm>
	#include <locale>

	#include "HEJ/Mixmax.hh"
	#include "HEJ/Ranlux64.hh"
	#include "HEJ/exceptions.hh"

	namespace HEJ {
	std::unique_ptr<RNG> make_RNG(
	std::string const & name,
	optional<std::string> const & seed
	) {
	std::string lname;
	std::transform(
	begin(name), end(name), std::back_inserter(lname),
	[](char c) { return std::tolower(c, std::locale()); }
	);
	if(lname == "mixmax") {
	if(seed) return std::make_unique<Mixmax>(std::stol(*seed));
	return std::make_unique<Mixmax>();
	}
	if(lname == "ranlux64") {
	if(seed) return std::make_unique<Ranlux64>(*seed);
	return std::make_unique<Ranlux64>();
	}
	throw std::invalid_argument{"Unknown random number generator: " + name};
	}
	} // namespace HEJ