ExtUtils::Constant
Generates XS code to import C header constants, allowing Perl modules to AUTOLOAD constants defined in C library header files. Generally, you should not touch ExtUtils::Constant functions, since they are already implemented by h2xs.
For example:
use ExtUtils::Constant qw (WriteConstants);
WriteConstants(
NAME => `Nate',
NAMES => [qw(Nate Nathan Nathaniel)], # not Nat
);
# Generates wrapper code to make the values of the constants
# Nate Nathan Nathaniel available to perlCurrently, this module understands the following types, although h2xs may only know a subset. The sizes of the numeric types are chosen by the Configure script at compile time.
IVSigned integer. At least 32 bits.
UVUnsigned integer. The same size as
IV.NVFloating-point type. Probably
double. Possiblylong double.PV NUL[L]Terminated string. Length will be determined with
strlen.PVNA fixed-length thing, given as a pointer, length pair. If you know the length of a string at compile time, you can use this instead of
PV.SVA mortal SV.
YESTruth (
PL_sv_yes). The value is not needed (and is ignored).NODefined falsehood (
PL_sv_no). The value is not needed (and is ignored).UNDEFThe value of the macro is not needed.
ExtUtils::Constant implements the following functions.