| slovo | definícia |
singleton variable
(foldoc) | singleton variable
A variable which is only referred to once in a
piece of code, probably because of a programming mistake. To
be useful, a variable must be set and read from, in that
order. If it is only referred to once then it cannot be both
set and read.
There are various exceptions. C-like {assignment
operators}, e.g. "x += y", read and set x and return its new
value (they are abbreviations for "x = x+y", etc). A
function argument may be passed only for the sake of
uniformity or to support future enhancements. A good
compiler or a syntax checker like lint should report
singleton variables but also allow specific instances to be
marked as deliberate by the programmer.
(1997-12-20)
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