英和和英

名詞

downpointer (複数形 downpointers)

1. (computing theory) A pointer in a hierarchical data structure that points to the node that is down from the current node.
   • 1969, Information Processing: Proceedings of the IFIP Congress, page 1249:

     Except at level zero, the downpointer always points down.

   • 1985, Society for Industrial and Applied Mathematics, SIAM Journal on Computing (volume 14, page 244)

     […] this data structure differs from the tree […] illustrated in Fig. 1, only by having downpointers replaced by downtrees.

   • 2004, Allen B. Tucker, Computer Science Handbook (page 11-25)

     By using the so-called functional approach to data structures Chazelle [1988] developed a compression scheme to encode the downpointers used by Willard [1985] to reduce further the space requirement.

2. (aviation) An indicator that points toward the ground.
   • 1989, Aviation Space and Environmental Medicine, page 492:

     During one session , the subject used a canopy-mounted downpointer to estimate position in space relative to the ground, and in the other session the subject used a joystick-controlled, inside-out, aircraft attitude indicator.