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Thread: Using TBuf as c++ std string
Started 2 months ago by StasV
Hello! I have such a function. Code: TBuf<50> Utils::LoadMessageL(int mesageId) { TBuf<50> text; text.Copy(_L("Some text")); return text; } Everything works just fine. But code scanner in carbide IDE tells me, that I am returning-descriptor-out-of-scope. Am I? Please, note, that Code: iUserManager->iUserLogin= iUserLogin; also works fine for me....
Site: Nokia Developer Discussion Boards  Nokia Developer Discussion Boards - site profile
Forum: General Symbian C++  General Symbian C++ - forum profile
Total authors: 3 authors
Total thread posts: 4 posts
Thread activity: no new posts during last week
Domain info for: nokia.com

Other posts in this thread:

laa-laa replied 2 months ago
No, you're returning a /copy/ of the TBuf that goes out of scope. It works but is not very efficient. It would be broken if the return type was either a pointer or reference to the out-of-scope stack-based buffer. If you need a function to return dynamic strings efficiently, either allocate them in the function (allocate and return an HBufC) or take in a target buffer (a TDes& function ...
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StasV replied 2 months ago
No-error, but not efficiently - but highlighted like error. Thanks.
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wizard_hu_ replied 2 months ago
If you read the description, it says that such code can panic on WINSCW, that is why it has "high" severity. TBuf-s are templates with some hacked size, that may be the reason if certain compilers find it difficult to copy properly.
Size: 299 bytes
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Top contributing authors

Name
Posts
StasV
2
user's latest post:
Using TBuf<X> as c++ std...
Published (2009-10-28 10:06:00)
No-error, but not efficiently - but highlighted like error. Thanks.
laa-laa
1
user's latest post:
Using TBuf<X> as c++ std...
Published (2009-10-28 09:57:00)
No, you're returning a /copy/ of the TBuf that goes out of scope. It works but is not very efficient. It would be broken if the return type was either a pointer or reference to the out-of-scope stack-based buffer. If you need a function to return dynamic strings efficiently, either allocate them in the function (allocate and return an HBufC) or take in a target buffer (a TDes&amp; function parameter). Lauri
wizard_hu_
1
user's latest post:
Using TBuf<X> as c++ std...
Published (2009-10-28 14:59:00)
If you read the description, it says that such code can panic on WINSCW, that is why it has &quot;high&quot; severity. TBuf-s are templates with some hacked size, that may be the reason if certain compilers find it difficult to copy properly.

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