pdf:typing
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| pdf:typing [2015/04/02 16:14] – [Specializing] christian | pdf:typing [2015/04/02 16:17] (current) – [specializes] christian | ||
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| From the pragmas above types (instances of Type) are created when sending #typesOf: to a Dictionary with the attribute name as argument. Example: | From the pragmas above types (instances of Type) are created when sending #typesOf: to a Dictionary with the attribute name as argument. Example: | ||
| - | | + | <code smalltalk> |
| + | Trailer new typesOf: #Root | ||
| + | </ | ||
| returns | returns | ||
| - | | + | <code smalltalk> |
| + | Array with: (IndirectType on: Catalog) | ||
| + | </ | ||
| - | === Extended typing === | + | ==== Extended typing |
| Typing is extended to be able to group several classes in different implementation hierarchies into an abstract PDF Type. | Typing is extended to be able to group several classes in different implementation hierarchies into an abstract PDF Type. | ||
| Line 81: | Line 85: | ||
| ==== subsumes ==== | ==== subsumes ==== | ||
| - | PDFObject isType: aType | + | |
| + | <code smalltalk> | ||
| + | PDFObject isType: aType | ||
| + | </ | ||
| and | and | ||
| - | PDFObject class subsumes: aPDFObject | + | <code smalltalk> |
| + | PDFObject class subsumes: aPDFObject | ||
| + | </ | ||
| First, we need to know if an object is already of a specific type. If this is true, we leave it alone, since it is already what we wanted. | First, we need to know if an object is already of a specific type. If this is true, we leave it alone, since it is already what we wanted. | ||
| Line 90: | Line 99: | ||
| ==== specializes ==== | ==== specializes ==== | ||
| - | aPDFObject asType: aType | + | <code smalltalk> |
| + | aPDFObject asType: aType | ||
| + | </ | ||
| and | and | ||
| - | PDFObject class specializes: | + | <code smalltalk> |
| + | PDFObject class specializes: | ||
| + | </ | ||
| When an object is not a subclass of a type, it can be specialized if the objects class subsumes the type. | When an object is not a subclass of a type, it can be specialized if the objects class subsumes the type. | ||
/var/www/virtual/code4hl/html/dokuwiki/data/pages/pdf/typing.txt · Last modified: 2015/04/02 16:17 by christian