Databases
StackOverflow2013
Postsdbo
POIs it ever not safe to throw an exception in a constructor?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIs it ever not safe to throw an exception in a constructor?
    primarykey
    data
    text
    <p>I know that it's not safe to throw exceptions from destructors, but is it ever unsafe to throw exceptions from constructors? </p> <p>e.g. what happens for objects that are declared globally? A quick test with gcc and I get an abort, is that always guaranteed? What solution would you use to cater for that situation?</p> <p>Are there any situations where constructors can throw exceptions and not leave things how we expect.</p> <p>EDIT: I guess I should add that I'm trying to understand under what circumstances I could get a resource leak. Looks like the sensible thing to do is manually free up resources we've obtained part way through construction before throwing the exception. I've never needed to throw exceptions in constructors before today so trying to understand if there are any pitfalls.</p> <p>i.e. Is this also safe?</p> <pre><code>class P{ public: P() { // do stuff... if (error) throw exception } } dostuff(P *p){ // do something with P } ... try { dostuff(new P()) } catch(exception) { } </code></pre> <p>will the memory allocated to the object P be released?</p> <p>EDIT2: Forgot to mention that in this particular case dostuff is storing the reference to P in an output queue. P is actually a message and dostuff takes the message, routes it to the appropriate output queue and sends it. Essentially, once dostuff has hold of it, it gets released later in the innards of dostuff. I think I want to put an autoptr around P and call release on the autoptr after dostuff to prevent a memory leak, would that be correct?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMatt
    1. USMatt
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POIs it ever not safe to throw an exception in a constructor?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POIs it ever not safe to throw an exception in a constructor?
      1. USDima
      1. VTFavorite
    3. VO
      singulars
      1. POIs it ever not safe to throw an exception in a constructor?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COsimilar discussion in http://stackoverflow.com/questions/1183531/how-much-work-should-an-object-constructor-do
      singulars
      1. POIs it ever not safe to throw an exception in a constructor?
      1. This table or related slice is empty.
    2. COYou should not need to manually clean up your members. This should be realatively automatic with RAII
      singulars
      1. POIs it ever not safe to throw an exception in a constructor?
      1. USMartin York
 

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.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload