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Tcl_PkgRequire(3)		      Tcl Library Procedures			Tcl_PkgRequire(3)


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

       #include <tcl.h>

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

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

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

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

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

       Tcl_PkgProvide(interp, name, version)

       Tcl_PkgProvideEx(interp, name, version, clientData)

       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 particular version
					      specified by version  is	acceptable.   Zero  means
					      that  newer  versions than version are also accept-
					      able as long as they have the  same  major  version
					      number as version.

       ClientData clientData (in)	      Arbitrary value to be associated with the package.

       ClientData *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 suc-

       int objc (in)			      Number of requirements.

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

       These procedures provide C-level interfaces to Tcl's package and version management facil-

       Tcl_PkgRequire  is equivalent to the package require command, Tcl_PkgPresent is equivalent
       to the package present command, and Tcl_PkgProvide is equivalent to  the  package  provide

       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 interpreter's result.

       Tcl_PkgProvideEx,  Tcl_PkgPresentEx  and Tcl_PkgRequireEx allow the setting 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

       package, present, provide, require, version

Tcl					       7.5				Tcl_PkgRequire(3)
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