The OBJECT C data type that Ctalk uses internally stores
objects’ values as C char *’s.
See OBJECT typedef.
To store numeric values, you must format them as character strings,
using, for example, sprintf. In many cases, however, Ctalk
performs this translation automatically.
Integer objects can also translate values with atoi(3)
or __ctalkDecimalIntegerToASCII. Other scalar data types have
corresponding functions that translate numbers to character strings.
If for some reason you need to translate an object to its C type or back again, the Ctalk library provides the following functions.
__ctalkToCArrayElement (OBJECT *o)Translate the value of an Integer, Character,
String, or LongInteger array element to a void *
that points to its corresponding C data type.
__ctalkToCCharPtr (OBJECT *o, int keep)Translate the value of a String object into a C char *.
If keep is FALSE, delete o.
__ctalkToCIntArrayElement (OBJECT *o)Translate the value of an Integer array element to an
int.
__ctalkToCInteger (OBJECT *o, int keep_object)Translate the value of an Integer to an int. If
keep_object is FALSE, then delete the object.
__ctalkToCInteger (OBJECT *o, int keep_object)Translate the value of an Integer to a long int. If
keep_object is FALSE, then delete the object.
__ctalk_to_c_char_ptr (OBJECT *o)Translate the value of a String object into a C char *.
Note: This function is being phased out. Use __ctalkToCCharPtr (),
above, instead.
__ctalk_to_c_double (OBJECT *o)Translate the value of a Float object into a C double.
__ctalk_to_c_int (OBJECT *o)Translate the value of an Integer object into a C int.
__ctalk_to_c_longlong (OBJECT *obj, int keep)Translate the value of a LongInteger object into a C long
long int. If keep is non-zero, does not delete obj, or,
in compound expressions that need to interface with C variables, (like
complex if-statement conditionals), whether to delete the library’s
internal C variable registrations.
Formats the arguments of the second-most calling method and
prints them on the receiver. This function is meant to be used
within a method that is called by another method. One method that
uses this function is String : vPrintOn. Refer to
String : vPrintOn for an example of this function’s use.
See vPrintOn--class String
__ctalkCBoolToObj (bool b)Create a Boolean object with the boolean (either true or false)
value of the argument.
__ctalkCCharPtrToObj (char *s)Create a String object with the value s.
__ctalkClassLibraryPath (void)Return a char * containing the directories that Ctalk
searches for class libraries. When compiling programs Ctalk
searches first for directories given as arguments to the
‘-I’ option, then directories given by the
CLASSLIBDIRS environment variable, then the standard
class library directory which is defined when Ctalk is
built. In addition, for each directory, if a subdirectory named
ctalk exists, then Ctalk searches that subdirectory also.
The standard library directory defaults to
/usr/local/include/ctalk, although if you define a
different ‘--prefix’ when building and installing
Ctalk, the class libraries will be located in
prefix/include/ctalk.
If it is necessary to look up class libraries at run time,
Ctalk first searches the directories listed by the
CLASSLIBDIRS environment variable, then the default
class library directory mentioned above.
__ctalkClassSearchPath (void)A synonym for __ctalkClassLibraryPath(), above.
__ctalkCDoubleToObj (double f)Create a Float object with the value f.
__ctalkCIntToObj (int i)Create an Integer object with the value i.
__ctalkCLongLongToObj (long long int l)Create a LongInteger object with the value l.
__ctalkCSymbolToObj (unsigned int label)Create a Symbol object with the value that is the address of
label. This is used for expressions where a function name
appears by itself, for example. In that case, the result is a
Symbol object with the address of the function.
The functions that create objects give the objects the scope of the function call, either global or local.
Note: In future versions of Ctalk, the names of these functions are likely to change.