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Tcl_PkgRequire(3)	    Tcl Library Procedures	     Tcl_PkgRequire(3)

______________________________________________________________________________

NAME
       Tcl_PkgRequire,	Tcl_PkgRequireEx,  Tcl_PkgRequireProc, Tcl_PkgPresent,
       Tcl_PkgPresentEx, Tcl_PkgProvide, Tcl_PkgProvideEx  -  package  version
       control

SYNOPSIS
       #include <tcl.h>

       const char *
       Tcl_PkgRequire(interp, name, version, exact)

       const char *
       Tcl_PkgRequireEx(interp, name, version, exact, clientDataPtr)

       int
       Tcl_PkgRequireProc(interp, name, objc, objv, clientDataPtr)

       const char *
       Tcl_PkgPresent(interp, name, version, exact)

       const char *
       Tcl_PkgPresentEx(interp, name, version, exact, clientDataPtr)

       int
       Tcl_PkgProvide(interp, name, version)

       int
       Tcl_PkgProvideEx(interp, name, version, clientData)

ARGUMENTS
       Tcl_Interp *interp (in)		 Interpreter  where  package is needed
					 or available.

       const char *name (in)		 Name of package.

       const char *version (in)		 A version string consisting of one or
					 more  decimal	numbers	 separated  by
					 dots.

       int exact (in)			 Non-zero means that only the particu‐
					 lar  version  specified by version is
					 acceptable.  Zero  means  that	 newer
					 versions   than   version   are  also
					 acceptable as long as they  have  the
					 same major version number as version.

       const void *clientData (in)	 Arbitrary value to be associated with
					 the package.

       void *clientDataPtr (out)	 Pointer to place to store  the	 value
					 associated with the matching package.
					 It is only changed if the pointer  is
					 not  NULL  and the function completed
					 successfully. The storage can be  any
					 pointer  type with the same size as a
					 void pointer.

       int objc (in)			 Number of requirements.

       Tcl_Obj* objv[] (in)		 Array of requirements.
_________________________________________________________________

DESCRIPTION
       These procedures provide C-level interfaces to Tcl's package  and  ver‐
       sion management facilities.

       Tcl_PkgRequire  is equivalent to the package require command, Tcl_PkgP‐
       resent is equivalent to the package present command, and Tcl_PkgProvide
       is equivalent to the package provide command.

       See  the	 documentation	for the Tcl commands for details on what these
       procedures do.

       If Tcl_PkgPresent or Tcl_PkgRequire complete successfully they return a
       pointer	to  the	 version string for the version of the package that is
       provided in the interpreter (which may be different than	 version);  if
       an  error  occurs  they	return	NULL and leave an error message in the
       interpreter's result.

       Tcl_PkgProvide returns TCL_OK if it completes successfully; if an error
       occurs  it  returns TCL_ERROR and leaves an error message in the inter‐
       preter's result.

       Tcl_PkgProvideEx, Tcl_PkgPresentEx and Tcl_PkgRequireEx allow the  set‐
       ting  and retrieving of the client data associated with the package. In
       all other respects they are equivalent to the matching functions.

       Tcl_PkgRequireProc is the form of  package  require  handling  multiple
       requirements.  The  other  forms are present for backward compatibility
       and translate their invocations to this form.

KEYWORDS
       package, present, provide, require, version

SEE ALSO
       package(n), Tcl_StaticPackage(3)

Tcl				      7.5		     Tcl_PkgRequire(3)
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