trick/docs/howto_guides/How-To-Exclude-Code.md

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# How do I exclude code from being processed by Trick?

#### Exclude directories via TRICK\_ICG\_EXCLUDE makefile or environment variable:
```
export TRICK_ICG_EXCLUDE = dir1:dir2
```

#### Exclude files via Trick header comment tag:
```c++
// Classic header
/*
PURPOSE: (some code)
ICG: (No)
*/

// Doxygen style header
/*
@trick_parse(dependencies_only)
*/
```

#### Ignore comments throughout the header:
```c++
// Classic header
/*
PURPOSE: (some code)
ICG: (NO_COMMENT)
*/

// Doxygen style header
/*
@trick_parse(attributes)
*/
```

#### Ignore individual classes via the header:
```c++
// Classic header
/*
PURPOSE: (some code)
ICG_EXCLUDE_CLASS: (class_name)
*/

//Doxygen style header
/*
@trick_exclude_typename(class_name)
*/
```