diff options
| -rw-r--r-- | txr.1 | 49 |
1 files changed, 44 insertions, 5 deletions
@@ -56368,14 +56368,13 @@ variable is available as a Lisp variable holding a Lisp data type. The .meta name -argument gives the name of the macro. +argument gives the name of the symbol macro to be defined. The .meta var-expr -argument must evaluate to a -.code cptr -object which holds a pointer to the address of the foreign -variable. +argument is one of several permitted syntactic forms +which specify the address of the foreign variable. +They are described below. The .meta type @@ -56399,6 +56398,46 @@ buffer is placed into the foreign variable. Then suppose another such assignment takes place. The previous value is simply overwritten without being freed. + +The following syntactic variants are permitted of the +.meta var-expr +argument: +.RS +.meIP < name-string +If +.meta var-expr +is a literal string, then the +.code deffi-var +form must be enclosed in the +.code with-dyn-lib +macro, appearing as one of that macro's +.metn body-form -s. +In this situation the literal character string +.meta name-string +specifies a symbol to be found within the library established by the +.meta with-dyn-lib +macro. +.meIP >> ( name-string << ver-string ) +This manner of specifying the +.meta fun-expr +also requires the +.code deffi +form to be enclosed in a +.codn with-dyn-lib . +It selects a particular version of a symbol from the library. +.meIP < form +If +.meta var-expr +is any other form, then it must specify an expression which evaluates to a +.code cptr +object giving the address of a foreign library symbol. If this form +is used, then the +.code deffi +form need not be surrounded by a call to the +.code with-dyn-lib +macro. +.RE + .coNP Macro @ typedef .synb .mets (typedef < name << type-syntax ) |