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


) K; l3 m1 U' M. Y1 变量声明


o Old way
/ `: t) y& l# X. k# P1 M// Declare pointers for an Item, Form and vector of ModelObjects
1 W1 R" o- S& t/ T- E4 L// initialize to NULL
Item *theItem = NULL;
Form *theForm = NULL;
vector< ModelObject *> objects;
) W! p+ [& ?  N2 V8 A...
! Z; r: U' o! h( i( P" `6 s9 e// Use the Item
4 {( z; O/ D! ]5 q$ l8 \theForm = theItem->get_item_master_tag();
% _+ h9 N8 E% j' J, nobjects = theItem->get_revision_list();
+ m- j2 @9 ]8 ?6 `, Qo New way
9 u3 t, q% n5 o  s// Declare AutoPtr for an Item, Form and vector of ModelObjects
// all AutoPtrs are instantiated as NULL
) W! `6 Q: F" VTeamcenter::Soa::Common::AutoPtr<Item> theItem;
Teamcenter::Soa::Common::AutoPtr<Form> theForm;
& {4 x$ K4 b5 R" n# \# \vector< Teamcenter::Soa::Common::AutoPtr <ModelObject> > objects;
// Use of the ModelObject variables remains unchanged
5 U/ y" h& b3 p; p1 J% l. {theForm = theItem->get_item_master_tag();
objects = theItem->get_revision_list();


2 类型转换
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: k+ r8 N3 }2 n# S; ^8 j" uo Old way
// Declare the variables
User *user;
ModelObject *anObj;
Folder *folder;
' F  E9 K& V8 {1 P; G" {user = sessionService->login(name,pass, “”,””, descrim ).user;
// Cast to the base ModelObject class
2 d5 y& q9 ?9 D) A/ j" K+ {anObj = (ModelObject*)user;
// Cast to a speicfic sub-type, if not NULL
// do something with the new pointer
+ A. y. f& G1 huser = dynamic_cast<User*>(anObj);
6 c: o: }2 ~5 ]+ W! w4 `7 z$ o1 Q" mif(user != NULL)
{
9 T; q# B. C. W9 C; Zfolder = user->get_home_folder();
$ ?4 q1 g0 y$ p5 S1 N}
& A9 K$ Q/ i8 K. `- K" Lo New way
// Declare the variables
( O0 o/ m& T  H4 }; Y7 sTeamcenter::Soa::Common::AutoPtr<User> user;
' W, z% s1 h2 W0 k" QTeamcenter::Soa::Common::AutoPtr<ModelObject> anObj;
: P3 t% S* S% z: Q: g6 f+ WTeamcenter::Soa::Common::AutoPtr<Folder> folder;
user = sessionService->login(name,pass, “”,””, descrim ).user;
; X8 L6 h* [/ a5 t5 Z: x// Cast to the base ModelObject class
anObj = user.cast<ModelObject>();
/ o6 i$ }8 T  i1 t* v// Put the cast to a speicfic sub-type, in a try/caTCh block
// if std::bad_cast not thrown, then cast was successful
# n: a  o" p% |try
% O& c9 I4 j: W+ a* ?. T3 @( p{
3 l0 K$ g) R8 g; R; X2 J7 L+ _- vuser = anObj.dyn_cast< User >();
folder = user->get_home_folder();
}
1 g0 Q- g) G, o  Y1 S- ^1 ]catch(std::bad_cast&){}
2 ?# y5 D' u) B( p

3 关于NULL 赋值
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; F3 K- c& ^5 o1 S% Zo Old way
// Declare the variables
LoginResponse response;
( I# \, }' T! S0 z0 h4 v" u5 DUser * user;
// Call a service that returns a ModelObject (User)
& `' P- ?: r: f1 r* A- B  e% ~1-28 Services Guide PLM00076 Jresponse = sessionService->login(name,pass, “”,””, descrim );
user = response.user;
// Test that instnace against NULL
" ?0 t2 D& ]- i- cif( user == NULL)
  j/ q" L* w1 N3 ^+ K* g; P' @{
...
}
* a" A- X6 K! u( @5 ielse
5 J+ r* A7 Z& \  v/ \8 G. d; E3 ^, j{
% O7 O6 V. @2 d) H5 T; I/ Y// Assign NULL to the pointer
! M5 k* u+ p/ n7 ]$ [# Q; {2 s7 U3 N& juser = NULL;
! N1 U9 |  I: K- p# u& o  X}
o New way
" A# G& ?3 s0 W// Declare the variables
( v3 r6 P7 t& r// The service data structures do not change, only
. }' R: h3 E& R- H& a// references to ModelObjects
. W4 G- |& H9 R; j+ `LoginResponse response;
: m, l7 x) y% p  i  s$ b3 l' bTeamcenter::Soa::Common::AutoPtr<User> user;
1 [- |8 D/ g+ V& O) i# o4 j) B1 s// Call a service that returns a ModelObject (User)
response = sessionService->login(name,pass, “”,””, descrim );
, G' i) a( F0 |( Yuser = response.user;
. }) t+ l0 q$ f4 ~5 t// Since we are not dealing directly with pointers,
// NULL does not make sense here, use the isNull method from the
! Z( T, y; x; p4 T// AutoPtr template class.
if( user.isNull())
{
...
: q6 I7 E; s5 s}
, I4 s  N" R! v6 Y+ _else
{
4 g8 \+ @% Q; q% R& Y4 |6 ~9 c// Release the instance and
user.release();
}

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