StackOverflow2013

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plurals

PO
primarykey
Id
5055450
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
5
CommunityOwnedDate
CreationDate
2011-02-20T05:38:08.350
FavoriteCount
0
LastActivityDate
2011-02-24T16:58:20.333
LastEditDate
2011-02-24T16:58:20.333
LastEditorUserId
415784
OwnerUserId
415784
ParentId
5055427
PostTypeId
2
Score
19
ViewCount
0
LastEditorDisplayName
text
Body
<pre><code>int & geta(void) const { return *a; } // good? int & getb(void) const { return b; } // obviously bad </code></pre> In a const-function, every data member becomes const in such way that it cannot be modified. <code>int</code> becomes <code>const int</code>, <code>int *</code> becomes <code>int * const</code>, and so on. Since the type of <code>a</code> in your first function becomes <code>int * const</code>, as opposed to <code>const int *</code>, so you can change the data (which is modifiable): <pre><code> m.geta() = 5; //works, as the data is modifiable </code></pre> Difference between : <code>const int*</code> and <code>int * const</code>. <ul> <li><code>const int*</code> means the pointer is non-const, but the data the pointer points to is const.</li> <li><code>int * const</code> means the pointer is const, but the data the pointer points to is non-const.</li> </ul> Your second function tries to return <code>const int &</code>, since the type of <code>b</code> become <code>const int</code>. But you've mentioned the actual return type in your code as <code>int &</code>, so this function would not even compile (see <a href="http://www.ideone.com/xjE8E">this</a>), irrespective of what you do in <code>main()</code>, because the return type doesn't match. Here is the fix: <pre><code> const int & getb(void) const { return b; } </code></pre> Now it <a href="http://www.ideone.com/J2eLN">compiles fine!</a>.
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singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POReturning non-const reference from a const member function
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USNawaz
UserOwnerUserId
1. USNawaz
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PostsAcceptedAnswerId
1. POReturning non-const reference from a const member function
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1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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2. VO
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3. VO
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CommentsPostId
1. This table or related slice is empty.

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