How could comma separated initialization such as in Eigen be possibly implemented in C++?

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The basic idea is to overload both the << and the , operators.

m << 1 is overloaded to put 1 into m and then returns a special proxy object – call it p – holding a reference to m.

Then p, 2 is overloaded to put 2 into m and return p, so that p, 2, 3 will first put 2 into m and then 3.

A similar technique is used with Boost.Assign, though they use += rather than <<.

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