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<title>glib-genmarshal: GObject Reference Manual</title>
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glib-genmarshal
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glib-genmarshal — C code marshaller generation utility for GLib closures
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Synopsis
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glib-genmarshal [OPTION...] [FILE...]
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Description
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glib-genmarshal is a small utility that generates C code
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marshallers for callback functions of the GClosure mechanism in the GObject
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sublibrary of GLib. The marshaller functions have a standard signature,
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they get passed in the invoking closure, an array of value structures holding
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the callback function parameters and a value structure for the return value
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of the callback. The marshaller is then responsible to call the respective C
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code function of the closure with all the parameters on the stack and to
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collect its return value.
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glib-genmarshal takes a list of marshallers to generate as
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input. The marshaller list is either read from files passed as additional arguments
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on the command line; or from standard input, by using - as the
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input file.
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Marshaller list format
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The marshaller lists are processed line by line, a line can contain a
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comment in the form of
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1
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# this is a comment
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or a marshaller specification of the form
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RTYPE:PTYPE
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RTYPE:PTYPE,PTYPE
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RTYPE:PTYPE,PTYPE,PTYPE
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The RTYPE part specifies the callback's return
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type and the PTYPEs right to the colon specify
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the callback's parameter list, except for the first and the last arguments
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which are always pointers.
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Parameter types
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Currently, the following types are supported:
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VOID
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indicates no return type, or no extra parameters.
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If VOID is used as the parameter list, no
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additional parameters may be present.
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BOOLEAN
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for boolean types (gboolean)
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CHAR
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for signed char types (gchar)
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UCHAR
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for unsigned char types (guchar)
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INT
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for signed integer types (gint)
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UINT
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for unsigned integer types (guint)
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LONG
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for signed long integer types (glong)
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ULONG
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for unsigned long integer types (gulong)
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INT64
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for signed 64bit integer types (gint64)
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UINT64
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for unsigned 64bit integer types (guint64)
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ENUM
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for enumeration types (gint)
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FLAGS
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for flag enumeration types (guint)
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FLOAT
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for single-precision float types (gfloat)
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DOUBLE
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for double-precision float types (gdouble)
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STRING
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for string types (gchar*)
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BOXED
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for boxed (anonymous but reference counted) types (GBoxed*)
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PARAM
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for GParamSpec or derived types (GParamSpec*)
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POINTER
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for anonymous pointer types (gpointer)
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OBJECT
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for GObject or derived types (GObject*)
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VARIANT
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for GVariant types (GVariant*)
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NONE
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deprecated alias for VOID
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BOOL
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deprecated alias for BOOLEAN
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Options
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--header
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Generate header file contents of the marshallers. This option is mutually
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exclusive with the --body option.
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--body
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Generate C code file contents of the marshallers. This option is mutually
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exclusive with the --header option.
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--prefix=PREFIX
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Specify marshaller prefix. The default prefix is `g_cclosure_user_marshal'.
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--skip-source
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Skip source location remarks in generated comments.
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--stdinc
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Use the standard marshallers of the GObject library, and include
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glib-object.h in generated header files. This
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option is mutually exclusive with the --nostdinc
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option.
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--nostdinc
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Do not use the standard marshallers of the GObject library, and skip
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glib-object.h include directive in generated header files.
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This option is mutually exclusive with the --stdinc option.
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--internal
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Mark generated functions as internal, using G_GNUC_INTERNAL.
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--valist-marshallers
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Generate valist marshallers, for use with g_signal_set_va_marshaller().
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-v, --version
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Print version information.
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--g-fatal-warnings
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Make warnings fatal, that is, exit immediately once a warning occurs.
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-h, --help
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Print brief help and exit.
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-v, --version
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Print version and exit.
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--output=FILE
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Write output to FILE instead of the standard output.
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--prototypes
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Generate function prototypes before the function definition in the C source
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file, in order to avoid a missing-prototypes compiler
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warning. This option is only useful when using the --body
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option.
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--pragma-once
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Use the once pragma instead of an old style header guard
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when generating the C header file. This option is only useful when using the
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--header option.
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--include-header=HEADER
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Adds a #include directive for the given file in the C
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source file. This option is only useful when using the --body
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option.
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-D SYMBOL[=VALUE]
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Adds a #define C pre-processor directive for
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SYMBOL and its given VALUE,
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or "1" if the value is unset. You can use this option multiple times; if you do,
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all the symbols will be defined in the same order given on the command line, before
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the symbols undefined using the -U option. This option is only
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useful when using the --body option.
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-U SYMBOL
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Adds a #undef C pre-processor directive to undefine the
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given SYMBOL. You can use this option multiple times;
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if you do, all the symbols will be undefined in the same order given on the
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command line, after the symbols defined using the -D option.
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This option is only useful when using the --body option.
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--quiet
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Minimizes the output of glib-genmarshal, by printing only
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warnings and errors. This option is mutually exclusive with the
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--verbose option.
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--verbose
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Increases the verbosity of glib-genmarshal, by printing
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debugging information. This option is mutually exclusive with the
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--quiet option.
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Using glib-genmarshal with Autotools
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In order to use glib-genmarshal in your project when using
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Autotools as the build system, you will first need to modify your
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configure.ac file to ensure you find the appropriate
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command using pkg-config, similarly as to how you discover
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the compiler and linker flags for GLib.
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PKG_PROG_PKG_CONFIG([0.28])
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PKG_CHECK_VAR([GLIB_GENMARSHAL], [glib-2.0], [glib_genmarshal])
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In your Makefile.am file you will typically need very
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simple rules to generate the C files needed for the build.
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marshal.h: marshal.list
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$(AM_V_GEN)$(GLIB_GENMARSHAL) \
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--header \
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--output=$@ \
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$<
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marshal.c: marshal.list marshal.h
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$(AM_V_GEN)$(GLIB_GENMARSHAL) \
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--include-header=marshal.h \
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--body \
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--output=$@ \
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$<
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BUILT_SOURCES += marshal.h marshal.c
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CLEANFILES += marshal.h marshal.c
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EXTRA_DIST += marshal.list
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In the example above, the first rule generates the header file and depends on
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a marshal.list file in order to regenerate the result in
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case the marshallers list is updated. The second rule generates the source file
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for the same marshal.list, and includes the file generated
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by the header rule.
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Example
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To generate marshallers for the following callback functions:
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1
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2
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7
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9
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void foo (gpointer data1,
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gpointer data2);
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void bar (gpointer data1,
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gint param1,
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gpointer data2);
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gfloat baz (gpointer data1,
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gboolean param1,
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guchar param2,
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gpointer data2);
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The marshaller.list file has to look like this:
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VOID:VOID
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VOID:INT
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FLOAT:BOOLEAN,UCHAR
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and you call glib-genmarshal like this:
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glib-genmarshal --header marshaller.list > marshaller.h
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glib-genmarshal --body marshaller.list > marshaller.c
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The generated marshallers have the arguments encoded in their function name.
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For this particular list, they are
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g_cclosure_user_marshal_VOID__VOID(...),
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g_cclosure_user_marshal_VOID__INT(...),
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g_cclosure_user_marshal_FLOAT__BOOLEAN_UCHAR(...).
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They can be used directly for GClosures or be passed in as the
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GSignalCMarshaller c_marshaller; argument upon creation of signals:
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1
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8
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GClosure *cc_foo, *cc_bar, *cc_baz;
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cc_foo = g_cclosure_new (NULL, foo, NULL);
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g_closure_set_marshal (cc_foo, g_cclosure_user_marshal_VOID__VOID);
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cc_bar = g_cclosure_new (NULL, bar, NULL);
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g_closure_set_marshal (cc_bar, g_cclosure_user_marshal_VOID__INT);
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cc_baz = g_cclosure_new (NULL, baz, NULL);
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g_closure_set_marshal (cc_baz, g_cclosure_user_marshal_FLOAT__BOOLEAN_UCHAR);
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See also
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glib-mkenums(1)
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Generated by GTK-Doc V1.27
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</body>
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</html>
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