StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
10282594
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2012-04-23T14:32:35.507
FavoriteCount
0
LastActivityDate
2012-04-23T14:32:35.507
LastEditDate
LastEditorUserId
0
OwnerUserId
271376
ParentId
10282108
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
<blockquote> Is inline keyword meaningful if function is defined in header file? </blockquote> It is. Following project will produce linker error on both msvc and g++ BECAUSE of the omission of inline keyword: <hr> main.cpp: <pre><code>#include "a.h" int main(int argc, char** argv){ A obj; obj.f(); a(); b(); return 0; } </code></pre> <hr> a.h: <pre><code>#ifndef A_HEADER #define A_HEADER class A{ public: void f(); }; void a(){ } void b(); void A::f(){ } #endif </code></pre> <hr> b.cpp: <pre><code>#include "a.h" void b(){ A obj; obj.f(); a(); } </code></pre> <hr> *.pro file (for Qt 4 build system): <pre><code>TEMPLATE = app TARGET = DEPENDPATH += . INCLUDEPATH += . HEADERS += a.h SOURCES += b.cpp main.cpp </code></pre> <hr> Compilation output: cl.exe: <hr> <pre><code>main.obj : error LNK2005: "void __cdecl a(void)" (?a@@YAXXZ) already defined in b.obj main.obj : error LNK2005: "public: void __thiscall A::f(void)" (?f@A@@QAEXXZ) already defined in b.obj debug\1234.exe : fatal error LNK1169: one or more multiply defined symbols found </code></pre> <hr> g++: <hr> <pre><code>debug/main.o: In function `Z1av': D:\c++\1234/a.h:6: multiple definition of `a()' debug/b.o:D:\c++\1234/a.h:6: first defined here debug/main.o:D:\c++\1234/a.h:11: multiple definition of `A::f()' debug/b.o:D:\c++\1234/a.h:11: first defined here collect2: ld returned 1 exit status make[1]: *** [debug/1234.exe] Error 1 make: *** [debug] Error 2 </code></pre> <hr> Now, why do you think this happens? Because compiler inserts contents of header file into *.cpp file when compiling. Since function isn't "inline", its name is made known to the linker, and each .obj/.o file will get its own unique copy of <code>A::f()</code> and <code>a()</code>. Linker won't know which you're supposed to use and will complain. If you make functions inline, everything will work fine. However, templates are another story.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POIs inline keyword meaningful if function is defined in header file?
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USSigTerm
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. COduplicate of http://stackoverflow.com/a/1759575/103167 The non-template case is already well explained in other questions.
 singulars
 PostPostId
 PO
 UserUserId
 USBen Voigt

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.