Add a variable to a class instance at runtime: Difference between revisions
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m (→{{header|Icon}} and {{header|Unicon}}: comment on safety) |
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=={{header|Icon}} and {{header|Unicon}}== |
=={{header|Icon}} and {{header|Unicon}}== |
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{{omit from|Icon}} |
{{omit from|Icon}} |
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Unicon implements object environments with records and supporting procedures for creation, initialization, and methods. To modify an instance you must create a new record then copy and amend it. The procedures ''constructor'' and ''fieldnames'' are needed. This example doesn't do error checking. Here ''extend'' takes three arguments, the class instance, a list of new variable names as strings, and an optional list of new values to be assigned. |
Unicon implements object environments with records and supporting procedures for creation, initialization, and methods. To modify an instance you must create a new record then copy and amend it. The procedures ''constructor'' and ''fieldnames'' are needed. This example doesn't do error checking. Here ''extend'' takes three arguments, the class instance, a list of new variable names as strings, and an optional list of new values to be assigned. As written this isn't safe from name collisions - aside from local declarations the use of a fixed constructor name uses the global name space. |
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''Note:'' Unicon can be translated via a command line switch into icon which allows for classes to be shared with Icon code (assuming no other incompatibilities exist). |
''Note:'' Unicon can be translated via a command line switch into icon which allows for classes to be shared with Icon code (assuming no other incompatibilities exist). |
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R_tempconstructor_1.d := 9 |
R_tempconstructor_1.d := 9 |
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R_tempconstructor_1.e := 7</pre> |
R_tempconstructor_1.e := 7</pre> |
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=={{header|J}}== |
=={{header|J}}== |
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