[omniORB] omniidl generated headers
Kevin Wooten
kwooten@itracs.com
Fri Oct 4 00:04:00 2002
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It seems to me that a lot of the code in the idl generated header files
can be implemented purely in templates, yet it is still generating a
class for it.
To use an example:
=20
//IDL
union Variant {
...
};
typedef sequence<Variant> VariantSeq;
=20
//produces the following c++
=20
class VariantSeq : public _CORBA_Unbounded_Sequence< Variant > {
public:
typedef VariantSeq_var _var_type;
inline VariantSeq() {}
inline VariantSeq(const VariantSeq& _s)
: _CORBA_Unbounded_Sequence< Variant > (_s) {}
=20
inline VariantSeq(_CORBA_ULong _max)
: _CORBA_Unbounded_Sequence< Variant > (_max) {}
inline VariantSeq(_CORBA_ULong _max, _CORBA_ULong _len, Variant* _val,
_CORBA_Boolean _rel=3D0)
: _CORBA_Unbounded_Sequence< Variant > (_max, _len, _val, _rel) {}
=20
=20
inline VariantSeq& operator =3D (const VariantSeq& _s) {
_CORBA_Unbounded_Sequence< Variant > ::operator=3D(_s);
return *this;
}
};
=20
This produces a type that is functionally the same as:
=20
typedef _CORBA_Unbounded_Sequence< Variant >
VariantSeq;
=20
although the VariantSeq produced by IDL is a distinct type in c++.
=20
The only difference this creates is that two IDL typedefs to the same
type are distinctly different in the typing system of c++.
Example IDL:
typedef sequence<Variant> VariantSeq;
typedef sequence<Variant> AnotherSeq;
=20
This IDL produces two distinctly different, yet functionally the same,
c++ types.
=20
Is this a requirement of the CORBA mapping, or some other requirement?
If it is, does anyone know the reason for it?
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<div class=3DSection1>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>It seems to me that a lot of the code in the <span
class=3DSpellE>idl</span> generated header files can be implemented =
purely in
templates, yet it is still generating a class for =
it.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>To use an example:<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'>  =
; </span>//IDL<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'>  =
; </span><span
class=3DGramE>union</span> Variant {<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:2'>  =
; =
</span>…<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'>  =
; </span>};<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'>  =
; </span><span
class=3DSpellE><span class=3DGramE>typedef</span></span> =
sequence<Variant> <span
class=3DSpellE>VariantSeq</span>;<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span =
style=3D'mso-tab-count:1'>  =
; </span>//produces
the following c++<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-indent:.5in'><span =
class=3DGramE><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>class</span></font></span><f=
ont
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <span
class=3DSpellE>VariantSeq</span> : public _<span =
class=3DSpellE>CORBA_Unbounded_Sequence</span><
Variant ><span style=3D'mso-spacerun:yes'> =
</span>{<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'text-indent:.5in'><span =
class=3DGramE><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>public</span></font></span><=
font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>:<o:p></o:p></span></font></=
p>
<p class=3DMsoNormal style=3D'margin-left:.5in;text-indent:.5in'><span
class=3DSpellE><span class=3DGramE><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>typedef</span></font></span></span><font =
size=3D2
face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'> <span
class=3DSpellE>VariantSeq_var</span> _<span =
class=3DSpellE>var_type</span>;<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in;text-indent:.5in'><span =
class=3DGramE><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>inline</span></font></span><=
font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <span
class=3DSpellE>VariantSeq</span>() {}<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><span =
class=3DGramE><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>inline</span></font></span><=
font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <span
class=3DSpellE>VariantSeq</span>(const <span =
class=3DSpellE>VariantSeq</span>&
_s)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in;text-indent:.5in'><font =
size=3D2
face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'>: _<span
class=3DSpellE>CORBA_Unbounded_Sequence</span>< Variant > (_s) =
{}<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><span =
class=3DGramE><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>inline</span></font></span><=
font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <span
class=3DSpellE>VariantSeq</span>(_<span =
class=3DSpellE>CORBA_ULong</span> _max)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in;text-indent:.5in'><font =
size=3D2
face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'>: _<span
class=3DSpellE>CORBA_Unbounded_Sequence</span>< Variant > (_max) =
{}<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in;text-indent:.5in'><span =
class=3DGramE><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>inline</span></font></span><=
font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <span
class=3DSpellE>VariantSeq</span>(_<span =
class=3DSpellE>CORBA_ULong</span> _max, _<span
class=3DSpellE>CORBA_ULong</span> _<span class=3DSpellE>len</span>, =
Variant* _<span
class=3DSpellE>val</span>, _<span class=3DSpellE>CORBA_Boolean</span> =
_<span
class=3DSpellE>rel</span>=3D0)<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in;text-indent:.5in'><font =
size=3D2
face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'>: _<span
class=3DSpellE>CORBA_Unbounded_Sequence</span>< Variant > (_max, =
_<span
class=3DSpellE>len</span>, _<span class=3DSpellE>val</span>, _<span =
class=3DSpellE>rel</span>)
{}<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'> =
</span><o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in;text-indent:.5in'><span =
class=3DGramE><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>inline</span></font></span><=
font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <span
class=3DSpellE>VariantSeq</span>& operator =3D (const <span =
class=3DSpellE>VariantSeq</span>&
_s) {<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in;text-indent:.5in'><font =
size=3D2
face=3DArial><span style=3D'font-size:10.0pt;font-family:Arial'>_<span
class=3DSpellE>CORBA_Unbounded_Sequence</span>< Variant <span =
class=3DGramE>>
:</span>:operator=3D(_s);<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in;text-indent:.5in'><span
class=3DGramE><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial'>return</span></font></span><font size=3D2 face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'> =
*this;<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>}<o:p></o:p></span></font></=
p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>};<o:p></o:p></span></font><=
/p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></fo=
nt></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>This produces a type that =
is functionally
the same as:<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></fo=
nt></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><span =
style=3D'mso-tab-count:1'>  =
; =
</span><span
class=3DSpellE><span class=3DGramE>typedef</span></span> _<span =
class=3DSpellE><span
style=3D'mso-bidi-font-style:italic'>CORBA_Unbounded</span>_Sequence</spa=
n><
Variant > <span =
class=3DSpellE>VariantSeq</span>;<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></fo=
nt></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><span =
class=3DGramE><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>although</span></font></span=
><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> the <span
class=3DSpellE>VariantSeq</span> produced by IDL is a distinct type in =
c++.<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></fo=
nt></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>The only difference this =
creates is that
two IDL <span class=3DSpellE>typedefs</span> to the same type are =
distinctly
different in the typing system of c++.<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Example =
IDL:<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><span =
style=3D'mso-tab-count:1'>  =
; =
</span><span
class=3DSpellE><span class=3DGramE>typedef</span></span> =
sequence<Variant> <span
class=3DSpellE>VariantSeq</span>;<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><span =
style=3D'mso-tab-count:1'>  =
; =
</span><span
class=3DSpellE><span class=3DGramE>typedef</span></span> =
sequence<Variant> <span
class=3DSpellE>AnotherSeq</span>;<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></fo=
nt></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>This IDL produces two =
distinctly
different, yet functionally the same, c++ =
types.<o:p></o:p></span></font></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></fo=
nt></p>
<p class=3DMsoNormal style=3D'tab-stops:63.0pt'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Is this a requirement of =
the CORBA
mapping, or some other requirement? If it is, does anyone know the =
reason for
it?<o:p></o:p></span></font></p>
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