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Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -27812,6 +27812,31 @@ to symbol macros. In addition, unlike also reduces to symbol macros those bindings which are initialized by symbol expressions (values of variables). +.coNP Macro @ alet +.synb +.mets (alet >> ({( sym << init-form )}*) << body-form *) +.syne +.desc +The macro +.code alet +("atomic" or "all") is a stronger form of the +.code slet +macro. The transformation of any of the bindings to symbol macros takes place +under the same conditions as under +.codn slet . +However, +.code alet +imposes the restriction that all the bindings must be transformed +to symbol macros, or not at all. + +The +.code alet +macro can be used to avoid introducing temporary variables in situations when +it is suspected that the initializing forms for the variables have side +effects through which they affect each others' evaluations. The suspicion is +lifted if the all initializing forms (after expansion) are constants, or +accesses to symbols. + .coNP Macro @ define-accessor .synb .mets (define-accessor < get-function << set-function ) |