There is no way to implement it directly. If you don’t want to enumerate, then there are only two ways that come to my mind:
Macro
SWIZZLING(v1,X,X,X,X) + SWIZZLING(v2,Z,Y,X,X)
Template
v1._<X,X,X,X>() + v2._<Z,Y,X,X>()
Variadic argument templates are actually simpler to make than macros with variable parameters. You can try it. The main idea is to first create a type of function F such that F(point<3>) == F(point<4>), and secondly to construct a type of piecewise function G to link G(v, X) to v.x Above, finally use variadic argument to do recursion, first get point<1>, then add a field to become point<2>, and do it until it is complete.
Finally, remember to use using + full specialization to point point<X> to type vecX.
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There is no way to implement it directly. If you don’t want to enumerate, then there are only two ways that come to my mind:
Macro
Template
Variadic argument templates are actually simpler to make than macros with variable parameters. You can try it. The main idea is to first create a type of function F such that F(point<3>) == F(point<4>), and secondly to construct a type of piecewise function G to link G(v, X) to v.x Above, finally use variadic argument to do recursion, first get point<1>, then add a field to become point<2>, and do it until it is complete.
Finally, remember to use using + full specialization to point point<X> to type vecX.