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


3 b) e* B2 x+ }1 变量声明


; a" I9 ~) Y, P8 `$ a* io Old way
; A1 I# K+ A; C5 L// Declare pointers for an Item, Form and vector of ModelObjects
// initialize to NULL
Item *theItem = NULL;
Form *theForm = NULL;
vector< ModelObject *> objects;
...
4 f. _) l) V! L0 b1 y6 s  F0 \// Use the Item
! a5 r' S; n2 h3 @/ j2 N7 `theForm = theItem->get_item_master_tag();
1 l7 \: `- w+ }4 ~objects = theItem->get_revision_list();
- C8 @9 [* t$ q# J% io New way
9 p9 E) Y- w# C8 O5 g// Declare AutoPtr for an Item, Form and vector of ModelObjects
6 x: i8 y6 e- E// all AutoPtrs are instantiated as NULL
. ^5 d$ f: k9 b* GTeamcenter::Soa::Common::AutoPtr<Item> theItem;
Teamcenter::Soa::Common::AutoPtr<Form> theForm;
vector< Teamcenter::Soa::Common::AutoPtr <ModelObject> > objects;
// Use of the ModelObject variables remains unchanged
. Z1 K- ?% ^3 g$ A7 p; p" btheForm = theItem->get_item_master_tag();
" r/ }8 z; s7 Sobjects = theItem->get_revision_list();


2 类型转换

/ ?/ K  s$ j- Z+ L8 m/ uo Old way
// Declare the variables
- @3 f8 n6 `: I& HUser *user;
ModelObject *anObj;
( U) D" }/ p, oFolder *folder;
" y3 C, Q7 O( ~" `* kuser = sessionService->login(name,pass, “”,””, descrim ).user;
1 q1 ~, |8 ?* d' O/ I3 A, [  J// Cast to the base ModelObject class
anObj = (ModelObject*)user;
+ m4 l; w0 y4 r2 g// Cast to a speicfic sub-type, if not NULL
// do something with the new pointer
user = dynamic_cast<User*>(anObj);
8 j- L' r9 J6 J# `, [if(user != NULL)
{
* o  O/ r/ U. a, f7 D3 ]folder = user->get_home_folder();
9 a3 i$ C5 f0 F1 ?! x}
o New way
4 u/ ^8 P, Q9 W1 _, U// Declare the variables
Teamcenter::Soa::Common::AutoPtr<User> user;
Teamcenter::Soa::Common::AutoPtr<ModelObject> anObj;
Teamcenter::Soa::Common::AutoPtr<Folder> folder;
user = sessionService->login(name,pass, “”,””, descrim ).user;
* o" G! r% q; W+ y// Cast to the base ModelObject class
' u# a6 R* q; d) B3 vanObj = 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
; `* p6 c9 ]7 @+ Vtry
{
user = anObj.dyn_cast< User >();
) P/ g- @2 G& H& ]6 t) a4 jfolder = user->get_home_folder();
}
catch(std::bad_cast&){}

: r- D+ d( {0 x. ]' f( S# P# \
3 关于NULL 赋值

o Old way
// Declare the variables
  P4 m5 ~" _4 v; N) k6 p$ zLoginResponse response;
User * user;
( o0 B+ t/ F0 ^+ E( F( d// Call a service that returns a ModelObject (User)
1-28 Services Guide PLM00076 Jresponse = sessionService->login(name,pass, “”,””, descrim );
; c6 r8 e5 N. t4 z5 C$ ^user = response.user;
5 `6 U2 C  O( W5 n5 Z1 N// Test that instnace against NULL
" T; k4 `8 l+ hif( user == NULL)
{
...
}
else
& ^8 S9 o0 Z( U{
// Assign NULL to the pointer
user = NULL;
! n& g! t) b. z}
o New way
% J! o6 ?: n) X3 O// Declare the variables
// The service data structures do not change, only
9 H- w% ?, E8 p6 t6 B7 i4 j// references to ModelObjects
LoginResponse response;
4 E6 Q/ c$ L5 F& I- E/ qTeamcenter::Soa::Common::AutoPtr<User> user;
// Call a service that returns a ModelObject (User)
2 U. W% h4 }$ P; }0 sresponse = sessionService->login(name,pass, “”,””, descrim );
# |- g6 {" o" c5 Q' nuser = response.user;
// Since we are not dealing directly with pointers,
// NULL does not make sense here, use the isNull method from the
8 M. A) Y* u5 j! T// AutoPtr template class.
if( user.isNull())
! R" F0 s" d2 j, P$ @  C{
5 P! s% V3 [6 w( p/ A4 z...
}
8 |# C9 u- B/ ~7 u2 y; W- Zelse
{
// Release the instance and
user.release();
}
6 I. A: F+ o% K( T3 e$ ^/ F4 C
9 {' k) p3 T; [- Y