Current File : //snap/gnome-42-2204/202/usr/lib/glibmm-2.4/proc/m4/vfunc.m4
dnl
dnl _VFUNC_PH(gtkname, crettype, cargs and names)
dnl Create a callback and set it in our derived G*Class.
dnl
define(`_VFUNC_PH',`dnl
_PUSH(SECTION_PCC_CLASS_INIT_VFUNCS)
ifelse(`$4',,,`#ifdef $4'
)dnl
klass->$1 = `&'$1_vfunc_callback;
ifelse(`$4',,,`#endif // $4
')dnl
_SECTION(SECTION_PH_VFUNCS)
ifelse(`$4',,,`#ifdef $4'
)dnl
static $2 $1_vfunc_callback`'($3);
ifelse(`$4',,,`#endif // $4
')dnl
_POP()')
dnl $1 $2 $3 $4
dnl _VFUNC_PCC(cppname,gtkname,cpprettype,crettype,
dnl $5 $6 $7 $8
dnl `<cargs and names>',`<cnames>',`<cpparg names>',firstarg,
dnl $9 $10 $11 $12
dnl refreturn_ctype, keep_return, ifdef, errthrow,
dnl $13 $14 $15 $16 $17
dnl slot_type, c_data_param_name, return_value, err_return_value, exception_handler)
dnl
dnl Note: _get_current_wrapper_inline() could be used throughout for performance instead of _get_current_wrapper(),
dnl and is_derived_() instead of is_derived_(),
dnl but it is not yet clear whether that would be a worthwhile performance optimization.
define(`_VFUNC_PCC',`dnl
_PUSH(SECTION_PCC_VFUNCS)
ifelse(`$11',,,`#ifdef $11'
)dnl
$4 __CPPNAME__`'_Class::$2_vfunc_callback`'($5)
{
ifelse(`$14',,,dnl
` const auto slot = static_cast<$13*>($14);
')dnl
dnl First, do a simple cast to ObjectBase. We will have to do a dynamic_cast
dnl eventually, but it is not necessary to check whether we need to call
dnl the vfunc.
const auto obj_base = static_cast<Glib::ObjectBase*>(
Glib::ObjectBase::_get_current_wrapper`'((GObject*)$8));
_IMPORT(SECTION_CHECK)
// Non-gtkmmproc-generated custom classes implicitly call the default
// Glib::ObjectBase constructor, which sets is_derived_. But gtkmmproc-
// generated classes can use this optimisation, which avoids the unnecessary
// parameter conversions if there is no possibility of the virtual function
// being overridden:
if(obj_base && obj_base->is_derived_())
{
dnl We need to do a dynamic cast to get the real object type, to call the
dnl C++ vfunc on it.
const auto obj = dynamic_cast<CppObjectType* const>(obj_base);
if(obj) // This can be NULL during destruction.
{
try // Trap C++ exceptions which would normally be lost because this is a C callback.
{
// Call the virtual member method, which derived classes might override.
ifelse($4,void,`dnl
obj->$1`'($7);
return;
',`dnl not void
ifelse($9,refreturn_ctype,`dnl Assume Glib::unwrap_copy() is correct if refreturn_ctype is requested.
return Glib::unwrap_copy`'(`obj->$1'($7));
',`dnl not refreturn_ctype
ifelse($10,keep_return,`dnl
static auto quark_return_value = g_quark_from_static_string("__NAMESPACE__::__CPPNAME__::$1");
auto return_value = static_cast<$3*>(g_object_get_qdata(obj_base->gobj(), quark_return_value));
if (!return_value)
{
return_value = new $3`'();
g_object_set_qdata_full(obj_base->gobj(), quark_return_value, return_value,
&Glib::destroy_notify_delete<$3>);
}
// Keep a copy of the return value. The caller is not expected
// to free the object that the returned pointer points to.
*return_value = obj->$1`'($7);
return _CONVERT($3,$4,`(*return_value)');
',`dnl not keep_return
return _CONVERT($3,$4,`obj->$1`'($7)');
')dnl end keep_return
')dnl end refreturn_ctype
')dnl end void
}
ifelse($17,,,`dnl if (exception_handler)
catch(...)
{
try
{
ifelse($9,refreturn_ctype,`dnl
return Glib::unwrap_copy`'(obj->$17`'());
', `dnl
return _CONVERT($3, $4, `obj->$17`'()');
')dnl
}
')dnl end exception_handler
ifelse($12,errthrow,`dnl
catch(Glib::Error& errormm)
{
errormm.propagate(error);
ifelse($4,void,`dnl
return;
',`dnl
ifelse(`$16', `',`dnl
using RType = $4;
return RType`'();
',`dnl
return _CONVERT($3,$4,`$16');
')dnl
')dnl
}
')dnl end errthrow
catch(...)
{
Glib::exception_handlers_invoke`'();
}
ifelse($17,,,`dnl if (exception_handler)
}
')dnl
}
}
BaseClassType *const base = static_cast<BaseClassType*>(
ifdef(`__BOOL_IS_INTERFACE__',`dnl
_IFACE_PARENT_FROM_OBJECT($8)dnl
',`dnl
_PARENT_GCLASS_FROM_OBJECT($8)dnl
') );
dnl g_assert(base != nullptr);
// Call the original underlying C function:
if(base && base->$2)
ifelse($4,void,,`return ')(*base->$2)`'($6);
ifelse($4,void,,`dnl
ifelse(`$15', `',`dnl
using RType = $4;
return RType`'();
',`dnl
return _CONVERT($3,$4,`$15');
')dnl
')dnl
}
ifelse(`$11',,,`#endif // $11
')dnl
_POP()')
# $1 $2 $3 $4 $5 $6 $7 $8 $9 $10 $11 $12 $13 $14
# _VFUNC_CC(vfunc_name, gtkname, cpp_rettype, c_rettype, `<cppargs>', `<carg_names>', is_const, refreturn, $ifdef, $errthrow, $slot_type, $slot_name, $no_slot_copy, $returnValue)
#
define(`_VFUNC_CC',`dnl
_PUSH(SECTION_CC_VFUNCS)
ifelse(`$9',,,`#ifdef $9'
)dnl
$3 __NAMESPACE__::__CPPNAME__::$1`'($5) ifelse($7,1,const,)
{
dnl If a slot type has been specified, insert code to create a copy of it.
ifelse(`$11',,,dnl
dnl See if the slot should or should not be copied
`ifelse(`$13',,dnl
` // Create a copy of the slot.
auto slot_copy = new $11($12); ',dnl
dnl
` // Use the original slot (not a copy).
auto slot_copy = const_cast<$11*>(&$12);')
')dnl
const auto base = static_cast<BaseClassType*>(
ifdef(`__BOOL_IS_INTERFACE__',`dnl
_IFACE_PARENT_FROM_OBJECT(gobject_)dnl
',`dnl
_PARENT_GCLASS_FROM_OBJECT(gobject_)dnl
') );
dnl g_assert(base != nullptr);
if(base && base->$2)
{
ifelse($10,errthrow,`dnl
GError* gerror = nullptr;
')dnl
ifelse($3,void,`dnl
(*base->$2)`'(ifelse(`$7',1,const_cast<__CNAME__*>(gobj()),gobj())`'_COMMA_PREFIX($6));
}
',`dnl
ifelse($8,refreturn,`dnl Assume Glib::wrap() is correct if refreturn is requested.
$3 retval(Glib::wrap((*base->$2)`'(ifelse(`$7',1,const_cast<__CNAME__*>(gobj()),gobj())`'_COMMA_PREFIX($6)), true));
',`dnl
$3 retval(_CONVERT($4,$3,`(*base->$2)`'(ifelse(`$7',1,const_cast<__CNAME__*>(gobj()),gobj())`'_COMMA_PREFIX($6))'));
')dnl
ifelse($10,errthrow,`dnl
if(gerror)
::Glib::Error::throw_exception(gerror);
')dnl
return retval;
}
ifelse(`$14', `',`dnl
using RType = $3;
return RType`'();
',`dnl
return $14;
')dnl
')dnl
}
ifelse(`$9',,,`#endif // $9
')dnl
_POP()')
# $1 $2 $3 $4 $5
# _VFUNC_H(vfunc_name, rettype, `<cppargs>', is_const, ifndef)
# Only used for custom vfuncs.
#
define(`_VFUNC_H',`dnl
_PUSH(SECTION_H_VFUNCS)
ifelse(`$5',,,`#ifdef $5'
)dnl
ifelse($4,`1',`dnl
virtual $2 $1`'($3) const;
',`dnl
virtual $2 $1`'($3);
')
ifelse(`$5',,,`#endif // $5
')dnl
_POP()')
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