Hello!

Suppose there is a Vector2d instance and we need to pass it to function expecting Vector3d:

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void someFunc(const Vector3d& vec);
...
Vector2d some2DVector(1, 2);
somFunc(Vector3d(some2DVector.x(), some2DVector.y(), 0));


Is there a better and more concise way to do this? May be using blocks or something like that?

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Vector2d a;
Vector3d b;
b << a, 0;


May be its good for initializing a new vector but its not that good for function call:

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void someFunc(const Vector3d& vec);
...
Vector2d some2DVector(1, 2);
somFunc((Vector3d() << some2DVector, 0).finished());


Any other ways?