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<h3 class="sectionHead"><span class="titlemark">6.3 </span> <a
id="x31-750006.3"></a>Create your own data type</h3>
<!--l. 54--><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="ec-lmsso-10">FILE</span>. To make
this type available on the model level, you have to declare the type.
</p><!--l. 58--><p class="noindent" >Open the file <span
class="ec-lmsso-10">Types.room </span>from <span
class="ec-lmsso-10">org.eclipse.modellib.c </span>and take a look at the declaration of <span
class="ec-lmsso-10">string </span>(last line)
which is not a basic C type.
</p><!--l. 61--><p class="noindent" ><span
class="ec-lmsso-10">PrimitiveType string:ptCharacter -> charPtr default "0"</span>
</p><!--l. 63--><p class="noindent" >With this declaration, you make the <span
class="ec-lmsso-10">string </span>keyword available on model level as a primitive type. This type will
be translated to <span
class="ec-lmsso-10">charPtr </span>in your C sources. <span
class="ec-lmsso-10">charPtr </span>is defined in <span
class="ec-lmsso-10">etDatatypes.h</span>. This header file is platform
specific (<span
class="ec-lmsso-10">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. 68--><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>
<!--l. 78--><p class="nopar" >
</p><!--l. 81--><p class="noindent" ><span
class="ec-lmsso-10">FILE </span>is the native type for MinGW. Therefore you don’t need a mapping within <span
class="ec-lmsso-10">etDatatypes.h</span>. If your model
should be portable across different platforms you should not take this shortcut.
</p>
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