Teamcenter SOA开发中关于变量声明，转换等代码的新处理方式

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Teamcenter SOA开发中关于变量声明，转换等代码的新处理方式
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; S; q  w3 E, `* U6 M1 变量声明


o Old way
// Declare pointers for an Item, Form and vector of ModelObjects
// initialize to NULL
# p) D& K, z7 N& c5 v/ hItem *theItem = NULL;
/ U, I+ Y0 V: A  U0 D4 Q7 iForm *theForm = NULL;
vector< ModelObject *> objects;
...
// Use the Item
9 _( V& A" |; `- c  E3 [* GtheForm = theItem->get_item_master_tag();
objects = theItem->get_revision_list();
7 L$ _, l4 ?# Eo New way
/ |4 l* y$ F2 D: X! L3 N  H// Declare AutoPtr for an Item, Form and vector of ModelObjects
// all AutoPtrs are instantiated as NULL
, R3 H0 ^6 \8 j0 {3 {Teamcenter::Soa::Common::AutoPtr<Item> theItem;
0 e4 N0 F- E7 X4 _Teamcenter::Soa::Common::AutoPtr<Form> theForm;
vector< Teamcenter::Soa::Common::AutoPtr <ModelObject> > objects;
// Use of the ModelObject variables remains unchanged
0 Y) ?1 o# g0 C1 ItheForm = theItem->get_item_master_tag();
! c& {! ~% d5 L% A6 Q8 W+ L- H$ S) I/ Q0 eobjects = theItem->get_revision_list();

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0 ?2 s( M3 F# {+ e6 H: p/ @; F! W2 类型转换

o Old way
// Declare the variables
; D7 m% {2 w$ SUser *user;
' Q6 [& f  G# _, ?( n8 @* rModelObject *anObj;
Folder *folder;
user = sessionService->login(name,pass, “”,””, descrim ).user;
// Cast to the base ModelObject class
anObj = (ModelObject*)user;
// Cast to a speicfic sub-type, if not NULL
9 G* Q0 i$ z# i// do something with the new pointer
  v( L, m* E" R  f$ Q  Ruser = dynamic_cast<User*>(anObj);
if(user != NULL)
{
folder = user->get_home_folder();
, c0 B) ]" D1 u6 J" T4 D2 X}
o New way
// Declare the variables
2 n' \+ [" S; Z: PTeamcenter::Soa::Common::AutoPtr<User> user;
8 C- ?8 Z* b( p! k& T! r2 a+ }% bTeamcenter::Soa::Common::AutoPtr<ModelObject> anObj;
  F7 x5 V0 b. t5 _; @/ b  w5 mTeamcenter::Soa::Common::AutoPtr<Folder> folder;
user = sessionService->login(name,pass, “”,””, descrim ).user;
& }0 T+ }; Q& U* H// Cast to the base ModelObject class
anObj = user.cast<ModelObject>();
0 Y; r1 j# N$ g// Put the cast to a speicfic sub-type, in a try/caTCh block
// if std::bad_cast not thrown, then cast was successful
try
- x' H  I: ]" m+ |0 Q5 D0 }0 ^{
2 x, D' F( w, suser = anObj.dyn_cast< User >();
folder = user->get_home_folder();
* i* e9 n. v: d; u}
catch(std::bad_cast&){}


3 关于NULL 赋值
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! f) R8 `' E! C% V7 v1 No Old way
// Declare the variables
LoginResponse response;
User * user;
// Call a service that returns a ModelObject (User)
- A) C% S& H+ o/ Z1-28 Services Guide PLM00076 Jresponse = sessionService->login(name,pass, “”,””, descrim );
user = response.user;
. l$ j* @8 N7 Z( k4 u// Test that instnace against NULL
if( user == NULL)
{
7 h  G& d+ {: q2 M...
, F5 T% P  a; F: ^; h}
( O( z4 q) q/ ]4 P* ]else
{
9 m3 I8 d. o' G3 Q% y// Assign NULL to the pointer
user = NULL;
}
; g+ C4 S# o7 u0 `! r) xo New way
// Declare the variables
// The service data structures do not change, only
6 i6 m# b. [. O// references to ModelObjects
) y& q( w. \5 H( D0 i) v1 a$ yLoginResponse response;
3 s1 Z. ~- Y/ o) u" @Teamcenter::Soa::Common::AutoPtr<User> user;
' a7 ?9 {: B. k2 K" q+ o/ C// Call a service that returns a ModelObject (User)
* j. c+ c3 I4 m3 B. L7 yresponse = sessionService->login(name,pass, “”,””, descrim );
user = response.user;
// Since we are not dealing directly with pointers,
// NULL does not make sense here, use the isNull method from the
// AutoPtr template class.
if( user.isNull())
{
...
}
. Z& Q. K" B& \' d9 N+ Aelse
{
// Release the instance and
user.release();
, |2 ^: }2 r4 A( l1 w! n% S}

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