StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POexplicit copy constructor ignored even if exact argument was provided
primarykey
Id
20431364
data
AcceptedAnswerId
0
AnswerCount
1
ClosedDate
CommentCount
9
CommunityOwnedDate
CreationDate
2013-12-06T18:48:03.740
FavoriteCount
0
LastActivityDate
2018-05-15T03:04:28.813
LastEditDate
2017-05-23T12:03:22.503
LastEditorUserId
-1
OwnerUserId
1135237
ParentId
0
PostTypeId
1
Score
1
ViewCount
339
LastEditorDisplayName
text
Body
The copy constructor has been provided. While using it exactly same type is passed to argument. Still the it seems the compiler( gcc/g++ 4.8.2) ignores existence of explicit copy constructor. The code generates compilation error. Why? The error is: <pre><code>t.cpp: In function ‘A f(const A&)’: t.cpp:19:12: error: no matching function for call to ‘A::A(const A&)’ return a; //compilation error with gcc 4.8.2 ^ t.cpp:19:12: note: candidate is: t.cpp:14:5: note: A::A() A(){} ^ t.cpp:14:5: note: candidate expects 0 arguments, 1 provided t.cpp:21:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ </code></pre> I have already gone through <a href="https://stackoverflow.com/questions/15049542/why-i-am-not-able-to-invoke-explicit-a-string-x">Why I am not able to invoke 'explicit a (string x)'?</a> and <a href="https://stackoverflow.com/questions/11480545/explicit-copy-constructor">Explicit copy constructor</a>. Based on the those links and i have tried the forcing copy construction (to avoid optimization,Refer to my commented code). <pre><code>#include <iostream> using namespace std; class A { public: explicit A(const A& a) // an explicit copy constructor //A(const A&) // an copy constructor, pretty much default one. //using it solves any compile problem. { cout << "\nin the copy constructor" << endl; } A(){} }; ////////////////////////////////// A f(const A &a) { return a; //compilation error with gcc 4.8.2 //return A(a); // even tried this to avoid optimization. does not work } /////////////////////////////////// int main() { //A a; //f(a); return 0; } </code></pre>
Tags
<c++><copy-constructor><explicit>
Title
explicit copy constructor ignored even if exact argument was provided
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. USqqqqq
plurals
PostLinksPostIdRelatedPostId
1. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
2. PL
 singulars
 LinkTypeLinkTypeId
 LTLinked
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POexplicit copy constructor ignored even if exact argument was provided
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTApproveEditSuggestion
2. VO
 singulars
 PostPostId
 POexplicit copy constructor ignored even if exact argument was provided
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId

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.