Method begin

Source/external/json.hpp:5255–5258

return iterator begin (needed for range-based for)

	/// return iterator begin (needed for range-based for)
	iteration_proxy_value<IteratorType> begin() const noexcept
	{
		return iteration_proxy_value<IteratorType>(container->begin());
	}

	/// return iterator end (needed for range-based for)
	iteration_proxy_value<IteratorType> end() const noexcept