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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! ]1 k) W# _* L# e& R* t1 变量声明
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o Old way
// Declare pointers for an Item, Form and vector of ModelObjects
: J1 R/ k6 A/ M$ a5 F// initialize to NULL
Item *theItem = NULL;
* L/ c& V* p2 t" C2 m# l5 _Form *theForm = NULL;
vector< ModelObject *> objects;
...
1 @  V) C6 G# p0 v$ u$ b; ]( E8 w// Use the Item
# X  k" p/ @/ A: ?9 @/ p! BtheForm = theItem->get_item_master_tag();
objects = theItem->get_revision_list();
, `' a) S, J, [9 Lo New way
// Declare AutoPtr for an Item, Form and vector of ModelObjects
// all AutoPtrs are instantiated as NULL
Teamcenter::Soa::Common::AutoPtr<Item> theItem;
2 W0 b1 Z0 u, ]. h/ zTeamcenter::Soa::Common::AutoPtr<Form> theForm;
vector< Teamcenter::Soa::Common::AutoPtr <ModelObject> > objects;
4 K9 V/ ^% l& O6 K) P) Y0 K3 _4 a/ V// Use of the ModelObject variables remains unchanged
% u/ p9 W' E- r3 n5 Z: x+ NtheForm = theItem->get_item_master_tag();
objects = theItem->get_revision_list();

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2 类型转换

3 x2 W. |& \! n& l+ `  l2 J: M7 Zo Old way
// Declare the variables
User *user;
+ l, k# H/ z8 q/ K/ W$ ^$ U0 I8 fModelObject *anObj;
Folder *folder;
user = sessionService->login(name,pass, “”,””, descrim ).user;
// Cast to the base ModelObject class
anObj = (ModelObject*)user;
2 U  f. c* n6 {$ f. ^6 Z* R( p; U// Cast to a speicfic sub-type, if not NULL
% j' r. w2 O6 b2 P) H3 V// do something with the new pointer
user = dynamic_cast<User*>(anObj);
# V8 D1 j2 u  O# i. @/ ~8 [5 s  y; sif(user != NULL)
{
! b: ?# `0 ^8 q/ x6 Afolder = user->get_home_folder();
% _8 T4 _  X4 D9 Z! i+ p3 a}
- h4 z8 j; d6 [. co New way
// Declare the variables
9 L& I2 b# }8 C* H* X9 i1 wTeamcenter::Soa::Common::AutoPtr<User> user;
Teamcenter::Soa::Common::AutoPtr<ModelObject> anObj;
Teamcenter::Soa::Common::AutoPtr<Folder> folder;
# h  O* I' j* G/ Guser = sessionService->login(name,pass, “”,””, descrim ).user;
6 h/ |- x. I9 d, j7 z0 n, u. B// Cast to the base ModelObject class
anObj = user.cast<ModelObject>();
// Put the cast to a speicfic sub-type, in a try/caTCh block
// if std::bad_cast not thrown, then cast was successful
try
6 T5 x# Z( `1 h7 X' C7 Z{
6 ?& Q4 X+ f0 \! y8 huser = anObj.dyn_cast< User >();
folder = user->get_home_folder();
}
catch(std::bad_cast&){}


3 关于NULL 赋值

4 Y$ B& ]- n3 |1 to Old way
3 @. x2 E: v2 ^* v# g// Declare the variables
LoginResponse response;
User * user;
// Call a service that returns a ModelObject (User)
1-28 Services Guide PLM00076 Jresponse = sessionService->login(name,pass, “”,””, descrim );
user = response.user;
- G. l* O0 H& x% S- @0 P// Test that instnace against NULL
8 T/ [& \, _" O6 V1 ?1 rif( user == NULL)
{
...
}
else
9 J; r3 ]* C' e: [; P{
. M, X: q" a% a* H2 }// Assign NULL to the pointer
user = NULL;
}
o New way
// Declare the variables
// The service data structures do not change, only
2 f, ^4 D2 Q8 S9 J# D1 O9 i// references to ModelObjects
LoginResponse response;
/ J+ J+ Z5 ^- t7 K- F, S8 x4 fTeamcenter::Soa::Common::AutoPtr<User> user;
' N% i$ ]6 x' H) l3 s$ V: P4 }// Call a service that returns a ModelObject (User)
response = sessionService->login(name,pass, “”,””, descrim );
user = response.user;
! G% J; r& X8 t  s- f& @' z! i// Since we are not dealing directly with pointers,
// NULL does not make sense here, use the isNull method from the
3 B- z1 T' j- n- |/ v5 u* ?/ _* W// AutoPtr template class.
  A) U, V9 S: c% x" iif( user.isNull())
; f. X; }/ q! a7 G{
...
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else
{
// Release the instance and
1 K5 S& B) F* o- D% @4 g& Wuser.release();
3 s3 Y+ y' [, E' O. }8 A- {}
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