Perl in a Nutshell, 2nd Edition

Name

XS_constant

Synopsis

XS_constant package, types, subname, c_subname
                  

Generates the XS code to implement the Perl subroutine package ::constant used by package ::AUTOLOAD to load constants. This XS code is a wrapper around a C subroutine usually generated by C_constant and usually named constant

types should be given either as a comma-separated list of types that the C subroutine constant will generate or as a reference to a hash. It should be the same list of types that C_constant was given. Otherwise, XS_constant and C_constant may have different ideas about the number of parameters passed to the C function constant.

You can call the Perl visible subroutine something other than “constant” if you give the parameter subname. The C subroutine it calls defaults to the name of the Perl visible subroutine, unless you give the parameter c_subname.