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<h3 class="sectionHead"><span class="titlemark">9.3 </span> <a
id="x45-610009.3"></a>Create your own data type</h3>
<!--l. 50--><p class="noindent" >The planed application should read a C source file and remove the comments.
Therefore we need a file descriptor which is not part of the basic C types. The type
for the file descriptor for MinGW is <span
class="ecti-1000">FILE</span>. To make this type available on the model
level, you have to declare the type.
</p><!--l. 52--><p class="noindent" >Open the file <span
class="ecti-1000">Types.room </span>from <span
class="ecti-1000">org.eclipse.modellib.c </span>and take a look at the
declaration of <span
class="ecti-1000">string </span>(last line) which is not a basic C type.
</p><!--l. 54--><p class="noindent" ><span
class="ecti-1000">PrimitiveType string:ptCharacter -> charPtr default "0"</span>
</p><!--l. 56--><p class="noindent" >With this declaration, you make the <span
class="ecti-1000">string </span>keyword available on model level as a
primitive type. This type will be translated to <span
class="ecti-1000">charPtr </span>in your C sources. <span
class="ecti-1000">charPtr </span>is
defined in <span
class="ecti-1000">etDatatypes.h</span>. This header file is platform specific (<span
class="ecti-1000">generic</span>). With this
mechanism you can define your own type system on model level and map the model
types to specific target/platform types.
</p><!--l. 58--><p class="noindent" >To not interfere with other models, we will declare the type direct in the model. Add
the following line to your model:
</p>
<div class="verbatim" id="verbatim-19">
RoomModel RemoveComment {
 <br />import room.basic.types.* from
 <br />"../../../org.eclipse.etrice.modellib.c/model/Types.room"
 <br />
 <br />PrimitiveType file:ptInteger -> FILE default "0"
</div>
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</p><!--l. 71--><p class="noindent" ><span
class="ecti-1000">FILE </span>is the native type for MinGW. Therefore you don’t need a mapping within
<span
class="ecti-1000">etDatatypes.h</span>. If your model should be portable across different platforms you should
not take this shortcut.
</p>
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