nsf

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Gustaf Neumann <neumann@wu-wien.ac.at>
committed
b44ba34
on 19 Dec 22
New feature: added support for return value checker for nsf::proc
One can now specify "-returns ...." in nsf::proc commands the same way
as … Show more
New feature: added support for return value checker for nsf::proc

One can now specify "-returns ...." in nsf::proc commands the same way

as in nx/XOTcl2 methods.

  nsf::proc ... /procName/ /arguments/ ?-returns /valueconstraint/? /body/

When return value checkers are defined, these are returned by the

usual introspection interface.

 % nsf::proc ::foo {-a:integer} -returns integer {return 1}

 % nsf::cmd::info definition ::foo

 ::nsf::proc ::foo -a:integer -returns integer {return 1}

 % nsf::cmd::info returns ::foo

 integer

The regression test was extended to cover these cases.

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define-incrementals + 2 more
doc/next-migration.txt (+1 -1)
1090 1090 assign statements in the constructor requires explicit constructor
1091 1091 calls, which are often error-prone. Certainly, when a user prefers to
1092 1092 assign initial values to instance variables via explicit assign
1093 1093 operations in constructors, this is as well possible in NX.
1094 1094
1095 1095 NX uses the same mechanism to define class variables or object
1096 1096 variables.
1097 1097
1098 1098 [options="header",cols="asciidoc,asciidoc",frame="none",valign="middle"]
1099 1099 |======================
1100 1100 |XOTcl |Next Scripting Language
1101 1101
1102 1102 |[source,tcl]
1103 1103 ----------------
1104 1104 # No syntactic support for creating
1105 1105 # class variables
1106 1106 ----------------
1107 1107 |[source,tcl]
1108 1108 ----------------
1109 1109
1110   # Define a object variable "V" with value 100 and
  1110 # Define an object variable "V" with value 100 and
1111 1111 # an instance variable "x". "V" is defined for the
1112 1112 # class object Foo, "x" is defined in the
1113 1113 # instances of the class. "object variable" works
1114 1114 # similar to "object method".
1115 1115
1116 1116 Class create Foo {
1117 1117   :object variable V 100
1118 1118   :variable x 1
1119 1119 }
1120 1120 ----------------
1121 1121 |======================
1122 1122
1123 1123 In the next step, we define configurable instance variables which we
1124 1124 call _properties_ in NX.
1125 1125
1126 1126 XOTcl uses the method +parameter+ is a shortcut for creating multiple
1127 1127 configurable variables with automatically created accessors (methods for
1128 1128 reading and writing of the variables). In NX, the preferred way to
1129 1129 create configurable variables is to use the method +property+. The
1130 1130 method +property+ in NX is similar to +variable+, but makes the