singleton variable

(programming)A variable which is only referred to once in apiece of code, probably because of a programming mistake. Tobe useful, a variable must be set and read from, in thatorder. If it is only referred to once then it cannot be bothset and read.

There are various exceptions. C-like assignment operators, e.g. "x += y", read and set x and return its newvalue (they are abbreviations for "x = x+y", etc). Afunction argument may be passed only for the sake ofuniformity or to support future enhancements. A goodcompiler or a syntax checker like lint should reportsingleton variables but also allow specific instances to bemarked as deliberate by the programmer.

单词	singleton variable
释义	singleton variable singleton variable (programming)A variable which is only referred to once in apiece of code, probably because of a programming mistake. Tobe useful, a variable must be set and read from, in thatorder. If it is only referred to once then it cannot be bothset and read. There are various exceptions. C-like assignment operators, e.g. "x += y", read and set x and return its newvalue (they are abbreviations for "x = x+y", etc). Afunction argument may be passed only for the sake ofuniformity or to support future enhancements. A goodcompiler or a syntax checker like lint should reportsingleton variables but also allow specific instances to bemarked as deliberate by the programmer.
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