min_element() fails to compile on custom container without an empty() method

[dfaure-kdab]

In my own class called Node, I wrote

	        using value_type     = std::unique_ptr<AbstractPrintItem>;
		using const_iterator = std::vector<std::unique_ptr<AbstractPrintItem>>::const_iterator;
		const_iterator begin() const
		{
			return m_printItems.begin();
		}
		const_iterator end() const
		{
			return m_printItems.end();
		}

This works fine for range-for, and STL algorithms.
But kdalgorithms::min_element failed to build with

kdalgorithms.h:214:19: error: ‘const class Node’ has no member named ‘empty’
  214 |     if (container.empty())

Shouldn't this be a begin()==end() test instead?