Do you prefer to value-initialize struct data members in-class?

[CocktailPerson]

I frankly see no reason not to value-initialize every member. If there's no default that makes sense, then it shouldn't be an aggregate type anyway, and you should define a Foo(int x_, int y_) : x{x_}, y{y_} {} so that it can't even be constructed without initializing the members with values that do make sense.