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authordimitri <dimitri@afe2bf4a-e733-0410-8a33-86f594647bc7>2012-03-22 19:19:06 (GMT)
committerdimitri <dimitri@afe2bf4a-e733-0410-8a33-86f594647bc7>2012-03-22 19:19:06 (GMT)
commite620712c9dd41c56bbd56d16a5a3469b96fafbf0 (patch)
tree2a7451abfd771d43ea2b3ac2443d94c3eb5cfee7 /trunk/doc/preprocessing.doc
parent8f455b66da9db238655242d1213c05affac412d9 (diff)
downloadDoxygen-Release_1_8_0.zip
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-/******************************************************************************
- *
- *
- *
- * Copyright (C) 1997-2012 by Dimitri van Heesch.
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation under the terms of the GNU General Public License is hereby
- * granted. No representations are made about the suitability of this software
- * for any purpose. It is provided "as is" without express or implied warranty.
- * See the GNU General Public License for more details.
- *
- * Documents produced by Doxygen are derivative works derived from the
- * input used in their production; they are not affected by this license.
- *
- */
-/*! \page preprocessing Preprocessing
-
-Source files that are used as input to doxygen can be parsed by doxygen's
-built-in C-preprocessor.
-
-By default doxygen does only partial preprocessing. That is, it
-evaluates conditional compilation statements (like \#if) and
-evaluates macro definitions, but it does not perform macro expansion.
-
-So if you have the following code fragment
-\verbatim
-#define VERSION 200
-#define CONST_STRING const char *
-
-#if VERSION >= 200
- static CONST_STRING version = "2.xx";
-#else
- static CONST_STRING version = "1.xx";
-#endif
-\endverbatim
-
-Then by default doxygen will feed the following to its parser:
-
-\verbatim
-#define VERSION
-#define CONST_STRING
-
- static CONST_STRING version = "2.xx";
-\endverbatim
-
-You can disable all preprocessing by setting
-\ref cfg_enable_preprocessing "ENABLE_PREPROCESSING" to \c
-NO in the configuration file. In the case above doxygen will then read
-both statements, i.e.:
-
-\verbatim
- static CONST_STRING version = "2.xx";
- static CONST_STRING version = "1.xx";
-\endverbatim
-
-In case you want to expand the \c CONST_STRING macro, you should set the
-\ref cfg_macro_expansion "MACRO_EXPANSION" tag in the config file
-to \c YES. Then the result after preprocessing becomes:
-
-\verbatim
-#define VERSION
-#define CONST_STRING
-
- static const char * version = "1.xx";
-\endverbatim
-
-Note that doxygen will now expand \e all macro definitions
-(recursively if needed). This is often too much. Therefore, doxygen also
-allows you to expand only those defines that you explicitly
-specify. For this you have to set the
-\ref cfg_expand_only_predef "EXPAND_ONLY_PREDEF" tag to \c YES
-and specify the macro definitions after
-the \ref cfg_predefined "PREDEFINED" or
-\ref cfg_expand_as_defined "EXPAND_AS_DEFINED" tag.
-
-A typically example where some help from the preprocessor is needed is
-when dealing with Microsoft's __declspec language extension. Here is an
-example function.
-
-\verbatim
-extern "C" void __declspec(dllexport) ErrorMsg( String aMessage,...);
-\endverbatim
-
-When nothing is done, doxygen will be confused and see __declspec as
-some sort of function. To help doxygen one typically uses the following
-preprocessor settings:
-
-\verbatim
-ENABLE_PREPROCESSING = YES
-MACRO_EXPANSION = YES
-EXPAND_ONLY_PREDEF = YES
-PREDEFINED = __declspec(x)=
-\endverbatim
-
-This will make sure the __declspec(dllexport) is removed before doxygen
-parses the source code.
-
-For a more complex example, suppose you have the following obfuscated
-code fragment of an abstract base class called \c IUnknown:
-
-\verbatim
-/*! A reference to an IID */
-#ifdef __cplusplus
-#define REFIID const IID &
-#else
-#define REFIID const IID *
-#endif
-
-
-/*! The IUnknown interface */
-DECLARE_INTERFACE(IUnknown)
-{
- STDMETHOD(HRESULT,QueryInterface) (THIS_ REFIID iid, void **ppv) PURE;
- STDMETHOD(ULONG,AddRef) (THIS) PURE;
- STDMETHOD(ULONG,Release) (THIS) PURE;
-};
-\endverbatim
-
-without macro expansion doxygen will get confused, but we may not want to
-expand the REFIID macro, because it is documented and the user that reads
-the documentation should use it when implementing the interface.
-
-By setting the following in the config file:
-
-\verbatim
-ENABLE_PREPROCESSING = YES
-MACRO_EXPANSION = YES
-EXPAND_ONLY_PREDEF = YES
-PREDEFINED = "DECLARE_INTERFACE(name)=class name" \
- "STDMETHOD(result,name)=virtual result name" \
- "PURE= = 0" \
- THIS_= \
- THIS= \
- __cplusplus
-\endverbatim
-
-we can make sure that the proper result is fed to doxygen's parser:
-\verbatim
-/*! A reference to an IID */
-#define REFIID
-
-/*! The IUnknown interface */
-class IUnknown
-{
- virtual HRESULT QueryInterface ( REFIID iid, void **ppv) = 0;
- virtual ULONG AddRef () = 0;
- virtual ULONG Release () = 0;
-};
-\endverbatim
-
-Note that the \ref cfg_predefined "PREDEFINED" tag accepts function
-like macro definitions
-(like \c DECLARE_INTERFACE ), normal macro
-substitutions (like \c PURE and \c THIS) and plain
-defines (like \c __cplusplus).
-
-Note also that preprocessor definitions that are normally defined
-automatically by the preprocessor (like \c __cplusplus), have to be defined
-by hand with doxygen's parser (this is done because these defines
-are often platform/compiler specific).
-
-In some cases you may want to substitute a macro name or function by
-something else without exposing the result to further macro substitution.
-You can do this but using the <code>:=</code> operator instead of
-<code>=</code>
-
-As an example suppose we have the following piece of code:
-\verbatim
-#define QList QListT
-class QListT
-{
-};
-\endverbatim
-
-Then the only way to get doxygen interpret this as a class definition
-for class QList is to define:
-\verbatim
-PREDEFINED = QListT:=QList
-\endverbatim
-
-Here is an example provided by Valter Minute and Reyes Ponce that helps
-doxygen to wade through the boilerplate code in Microsoft's ATL \& MFC
-libraries:
-
-\verbatim
-PREDEFINED = "DECLARE_INTERFACE(name)=class name" \
- "STDMETHOD(result,name)=virtual result name" \
- "PURE= = 0" \
- THIS_= \
- THIS= \
- DECLARE_REGISTRY_RESOURCEID=// \
- DECLARE_PROTECT_FINAL_CONSTRUCT=// \
- "DECLARE_AGGREGATABLE(Class)= " \
- "DECLARE_REGISTRY_RESOURCEID(Id)= " \
- DECLARE_MESSAGE_MAP= \
- BEGIN_MESSAGE_MAP=/* \
- END_MESSAGE_MAP=*/// \
- BEGIN_COM_MAP=/* \
- END_COM_MAP=*/// \
- BEGIN_PROP_MAP=/* \
- END_PROP_MAP=*/// \
- BEGIN_MSG_MAP=/* \
- END_MSG_MAP=*/// \
- BEGIN_PROPERTY_MAP=/* \
- END_PROPERTY_MAP=*/// \
- BEGIN_OBJECT_MAP=/* \
- END_OBJECT_MAP()=*/// \
- DECLARE_VIEW_STATUS=// \
- "STDMETHOD(a)=HRESULT a" \
- "ATL_NO_VTABLE= " \
- "__declspec(a)= " \
- BEGIN_CONNECTION_POINT_MAP=/* \
- END_CONNECTION_POINT_MAP=*/// \
- "DECLARE_DYNAMIC(class)= " \
- "IMPLEMENT_DYNAMIC(class1, class2)= " \
- "DECLARE_DYNCREATE(class)= " \
- "IMPLEMENT_DYNCREATE(class1, class2)= " \
- "IMPLEMENT_SERIAL(class1, class2, class3)= " \
- "DECLARE_MESSAGE_MAP()= " \
- TRY=try \
- "CATCH_ALL(e)= catch(...)" \
- END_CATCH_ALL= \
- "THROW_LAST()= throw"\
- "RUNTIME_CLASS(class)=class" \
- "MAKEINTRESOURCE(nId)=nId" \
- "IMPLEMENT_REGISTER(v, w, x, y, z)= " \
- "ASSERT(x)=assert(x)" \
- "ASSERT_VALID(x)=assert(x)" \
- "TRACE0(x)=printf(x)" \
- "OS_ERR(A,B)={ #A, B }" \
- __cplusplus \
- "DECLARE_OLECREATE(class)= " \
- "BEGIN_DISPATCH_MAP(class1, class2)= " \
- "BEGIN_INTERFACE_MAP(class1, class2)= " \
- "INTERFACE_PART(class, id, name)= " \
- "END_INTERFACE_MAP()=" \
- "DISP_FUNCTION(class, name, function, result, id)=" \
- "END_DISPATCH_MAP()=" \
- "IMPLEMENT_OLECREATE2(class, name, id1, id2, id3, id4,\
- id5, id6, id7, id8, id9, id10, id11)="
-\endverbatim
-
-As you can see doxygen's preprocessor is quite powerful, but if you want
-even more flexibility you can always write an input filter and specify it
-after the \ref cfg_input_filter "INPUT_FILTER" tag.
-
-If you are unsure what the effect of doxygen's preprocessing will be
-you can run doxygen as follows:
-\verbatim
- doxygen -d Preprocessor
-\endverbatim
-This will instruct doxygen to dump the input sources to standard output after
-preprocessing has been done (Hint: set <code>QUIET = YES</code> and
-<code>WARNINGS = NO</code> in the configuration file to disable any other
-output).
-
-\htmlonly
-Go to the <a href="external.html">next</a> section or return to the
- <a href="index.html">index</a>.
-\endhtmlonly
-
-*/