1Tcl_PkgRequire(3)           Tcl Library Procedures           Tcl_PkgRequire(3)
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5______________________________________________________________________________
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NAME

8       Tcl_PkgRequire,  Tcl_PkgRequireEx,  Tcl_PkgRequireProc, Tcl_PkgPresent,
9       Tcl_PkgPresentEx, Tcl_PkgProvide, Tcl_PkgProvideEx  -  package  version
10       control
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SYNOPSIS

13       #include <tcl.h>
14
15       const char *
16       Tcl_PkgRequire(interp, name, version, exact)
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18       const char *
19       Tcl_PkgRequireEx(interp, name, version, exact, clientDataPtr)
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21       int
22       Tcl_PkgRequireProc(interp, name, objc, objv, clientDataPtr)
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24       const char *
25       Tcl_PkgPresent(interp, name, version, exact)
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27       const char *
28       Tcl_PkgPresentEx(interp, name, version, exact, clientDataPtr)
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30       int
31       Tcl_PkgProvide(interp, name, version)
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33       int
34       Tcl_PkgProvideEx(interp, name, version, clientData)
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ARGUMENTS

37       Tcl_Interp *interp (in)                Interpreter   where  package  is
38                                              needed or available.
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40       const char *name (in)                  Name of package.
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42       const char *version (in)               A version string  consisting  of
43                                              one or more decimal numbers sep‐
44                                              arated by dots.
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46       int exact (in)                         Non-zero  means  that  only  the
47                                              particular  version specified by
48                                              version  is  acceptable.    Zero
49                                              means  that  newer versions than
50                                              version are also  acceptable  as
51                                              long as they have the same major
52                                              version number as version.
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54       ClientData clientData (in)             Arbitrary value to be associated
55                                              with the package.
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57       ClientData *clientDataPtr (out)        Pointer  to  place  to store the
58                                              value associated with the match‐
59                                              ing  package. It is only changed
60                                              if the pointer is not  NULL  and
61                                              the  function completed success‐
62                                              fully.
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64       int objc (in)                          Number of requirements.
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66       Tcl_Obj* objv[] (in)                   Array of requirements.
67_________________________________________________________________
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DESCRIPTION

71       These procedures provide C-level interfaces to Tcl's package  and  ver‐
72       sion management facilities.
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74       Tcl_PkgRequire  is equivalent to the package require command, Tcl_PkgP‐
75       resent is equivalent to the package present command, and Tcl_PkgProvide
76       is equivalent to the package provide command.
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78       See  the  documentation  for the Tcl commands for details on what these
79       procedures do.
80
81       If Tcl_PkgPresent or Tcl_PkgRequire complete successfully they return a
82       pointer  to  the  version string for the version of the package that is
83       provided in the interpreter (which may be different than  version);  if
84       an  error  occurs  they  return  NULL and leave an error message in the
85       interpreter's result.
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87       Tcl_PkgProvide returns TCL_OK if it completes successfully; if an error
88       occurs  it  returns TCL_ERROR and leaves an error message in the inter‐
89       preter's result.
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91       Tcl_PkgProvideEx, Tcl_PkgPresentEx and Tcl_PkgRequireEx allow the  set‐
92       ting  and retrieving of the client data associated with the package. In
93       all other respects they are equivalent to the matching functions.
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95       Tcl_PkgRequireProc is the form of  package  require  handling  multiple
96       requirements.  The  other  forms are present for backward compatibility
97       and translate their invokations to this form.
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99

KEYWORDS

101       package, present, provide, require, version
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105Tcl                                   7.5                    Tcl_PkgRequire(3)