diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 49 |
1 files changed, 32 insertions, 17 deletions
@@ -32181,7 +32181,8 @@ whereas .code add* adds elements at the front. -The return value of these methods is unspecified. +These methods return +.codn nil . .TP* Example: @@ -32225,7 +32226,8 @@ Both methods have the property that the constructed list does not share structure with the input lists. -The return value of these methods is unspecified. +These methods return +.codn nil . .TP* Example: @@ -32277,7 +32279,8 @@ which is an atom. This atom will simply be installed as the terminating atom of the list being constructed. -The return value of these methods is unspecified. +These methods return +.codn nil . .TP* Example: @@ -32374,19 +32377,37 @@ structure. They eliminate the explicit call to the function to construct the object, and eliminate the explicit references to the object. -Instead, -.code build -and -.code buildn -creates a lexical environment in which a +Both of these macros create a lexical environment in which a .code list-builder object is implicitly constructed and bound to a hidden variable. -Local functions which mimic the +This lexical environment also provides local functions named +.codn add , +.codn add* , +.codn pend , +.codn pend* , +.codn ncon , +.codn ncon* , +.codn get , +.code del +and +.codn del* , + +which mimic the .code list-builder -methods operate implicitly on this hidden variable, so that +methods, but operate implicitly on this hidden variable, so that the object need not be mentioned as an argument. +With the exception of +.codn get , +.code del +and +.codn del* , +the local functions return +.codn nil , +like the same-named +.code list-builder +methods. -Then, each +In this lexical environment, each .meta form is evaluated in order. @@ -32402,12 +32423,6 @@ returns the value of the last If no forms are enclosed, both macros return .codn nil . -With the exception of -.codn get , -the local functions have unspecified return values, like the same-named -.code list-builder -methods. - Note: because the local function .code del has the same name as a global macro, it is implemented as a |