Function pickRandom

library/xorshift.h:183–195

template <typename Container, typename Generator>
typename Container::const_reference pickRandom(Generator &g, const Container &c)
{
	// we can't do index lookups in a list, so we just have to iterate N times
	if (c.size() == 1)
	{
		return *begin(c);
	}
	else if (c.empty())
	{
		throw std::runtime_error("Trying to randomize within empty container");
	}
	return *std::next(begin(c), randBoundsExclusive(g, (unsigned)0, (unsigned)c.size()));
}

} // namespace OpenApoc