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ID: 18846, Always valid dynamic properties

by Andreas Jakobsche Email: Anonymous

examples of dynamic property implementations with always valid values
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For Delphi, Version 1.0  to 7.0 852 downloads
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Size: 198,681 bytes
Updated on Sat, 14 Sep 2002 12:51:56 GMT
Originally uploaded on Sat, 14 Sep 2002 12:44:24 GMT
SHA1 Hash: C730C2ED8FC5B756432AA8656056319F0C011A89
MD5 Hash: 693E879127FB21DED9C2E38EAA15A66A

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This is a sample project showing the development and the use of a component with a new property of the class TPersistent that never returns an invalid value and is written to and read from a stream together with the component instance. There is shown, that the application programmer never needs to check the validity of a property. By comparing the manually added properties of the sample form and the non-visible sample component you can see the differences between read-only, read-write properties and the difference between properties producing copies of or pointers to other instances even with the same operator ":=".

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