diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 46 |
1 files changed, 33 insertions, 13 deletions
@@ -26727,9 +26727,9 @@ is visible. Consequently, may be used to terminate the execution of the function and return a value. Such functions are called using the -.code "instance.[name arg ...]" -syntax which doesn't insert the instance into -the argument list. +.code "(call instance.name arg ...)" +or else the DWIM brackets syntax +.codn "[instance.name arg ...]" . The remarks about inheritance and overriding in the description of @@ -27422,13 +27422,18 @@ is evaluated only once: (qref o (n arg ...)) <--> (call (slot o 'n) o arg ...) .brev -A DWIM designator indicates that the named slot is a function or an -indexable or callable object. The following equivalence applies: +A DWIM designator similarly indicates that the named slot is a function, +and arguments are to be applied to it. The following equivalence applies: .verb - (qref obj [name arg ...]) <--> [(slot obj 'name) arg ...] + (qref obj [name arg ...]) <--> [(slot obj 'name) o arg ...] .brev +Therefore, under this equivalence, this syntax provides the usual Lisp-1-style +evaluation rule via the +.code dwim +operator. + If the .meta object-form has the syntax @@ -27468,7 +27473,7 @@ is the slot not accessed, but the argument expressions are not evaluated. (defvarl s (new foo)) ;; access third element of s.array: - s.[array 2] --> 3 + [s.array 2] --> 3 ;; increment first element of array by 42 s.(increment 0 42) --> 43 @@ -29120,11 +29125,12 @@ which may be used to invoke them, such as: .mets << object .(function-name < arg << ... ) .brev -However, those introduced as "Function" do not operate on an instance. For -brevity, their syntax is nevertheless exemplified as +However, those introduced as "Function" do not operate on an instance. +Their syntax is likewise indicated using the notation that may be used +to invoke them: .verb -.mets << object .'['function-name < arg << ... ']' +.mets <> '[' object .function-name < arg << ... ']' .brev If such a invocation is actually used, the @@ -29133,7 +29139,7 @@ instance only serves for identifying the struct type whose static slot .code function-name provides the function; .meta object -doesn't participate in the call. An object is not required since +doesn't participate in the call. An object is not strictly required since the function can be called using .verb @@ -29543,7 +29549,7 @@ is invoked. .coNP Function @ from-list .synb -.mets << object .'['from-list << list ']' +.mets <> '[' object .from-list << list ']' .syne .desc If a @@ -29574,7 +29580,7 @@ will always return a plain list of items. .coNP Function @ derived .synb -.mets << object .'['derived < supertype << subtype ']' +.mets <> '[' object .derived < supertype << subtype ']' .syne .desc If a structure type supports a function called @@ -77530,6 +77536,20 @@ of these version values, the described behaviors are provided if is given an argument which is equal or lower. For instance .code "-C 103" selects the behaviors described below for version 105, but not those for 102. +.IP 251 +Until \*(TX 251, the syntax +.code "obj.[fun arg]" +was equivalent to +.codn "[obj.fun arg]" , +providing little utility. +A compatibility value of 251 or lower restores that behavior. The new +behavior is that +.code "obj.[fun arg]" +is equivalent to +.codn "obj.[fun obj arg]" , +with +.code obj +evaluated only once, performing method dispatch. .IP 248 Until \*(TX 248, the .code hash-revget |