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Class Widget { public: Widget() { cout<<"~Widget()"<<endl; } ~Widget() { cout<<"~Widget()"<<endl; } void* operator new(size_t sz) throw(bad_alloc) { cout<<"operator new"<<endl; throw bad_alloc(); } void operator delete...
Started by s_itbhu on
, 8 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
So delete(void *v) { cout<<"operator delete"<<endl; }
};
int main() {
Widget* w = NULL is invoked on the null....
You were trying to delete a NULL pointer.
New Widget;
then things work as expected.
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I have a table called hl7_lock in SQL Server with these columns:
hl7_id lock_dtm lock_user
I have 3 triggers on the table for UPDATE, INSERT, and DELETE
The table is never updated, but INSERT trigger is working perfectly. However this delete trigger occasionally...
Started by Jim Blizard on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Into hl7_lock_log (user_name, action,hl7_id, dtm) select system_user, 'Delete', hl7_id, getdate() from deleted
Are you sure that records are in the 'deleted' table? If a delete statement is run on your.
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I just realized after years of writing C++, that I can safely delete a NULL pointer. So I figure, I'm not the only one that wasn't aware of this. Now I feel silly for all my
if(p) delete p;
code laying around.
Am I the only one that hadn't realized this...
Started by Robert Gould on
, 14 posts
by 14 people.
Answer Snippets (Read the full thread at stackoverflow):
To check for NULL before delete p?
It says that " The C++ language guarantees that delete p will do nothing reason for checking for null { delete pSomeObject; pSomeObject = NULL;//any reason for assigning ....
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Ask your Facebook Friends
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I'm confused why the following C++ code can compile. Why does a call to delete the method of 0 not produce any error?!
volatile *arr = NULL; // or if i use 0, it's the same thing delete arr;
I did try to run it, and it did not give me any error at all...
Started by cplusplusNewbie on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
For more info, check out Section 16.8,9 here :
You can delete a NULL pointer without problem, and the error you may/can have won....
On that :)
The C++ language guarantees that delete p will do nothing if p is equal to NULL.
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Possible Duplicate:
Deleting Objects in JavaScript
I have a JS object having a large number of properties. If I want to force the browser to garbage collect this object, do I need to set each of these properties as null or do I need to use the delete ...
Started by jeffreyveon on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
X.y = null; and delete x.y; both eliminate x 's I can think....
Setting them to null or deleting them are actually doing the same thing (delete collection in JavaScript, and you don't really need to.
Referenced anywhere.
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I have two entities A and B that are related in a MxN relation through an intermediary table, thus making a total of three tables. My relation table R has non-nullable FK constraints on the other two tables.
I want to delete all entries from tables A ...
Started by Miguel Ping on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
And finally, delete from B all records....
Third, delete from A all records that don't exist in the intermediary table.
Secondly delete from your intermediary table all the relations that fit your constraint.
Records to a temporary table.
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I always wondered why automatic setting of the pointer to NULL after delete is not part of the standard. If this gets taken care then many of the crashes due to invalid pointer would not occur. But having said that I could think of couple of reasons why...
Started by aJ on
, 10 posts
by 10 people.
Answer Snippets (Read the full thread at stackoverflow):
And C++ if the pointer you specified for the delete got set to null, but all the other pointers did want:
template<typename T> ....
Filling it with null is just a waste of time.
Of scope immediately after delete is done.
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I have two related clases JPA-annotated. Alarm and Status. One Alarm can have one Status.
What I need is to be able to delete one Status and "propagate" a null value to the Alarms that are in that Status that has been deleted.
That is, I need the foreign...
Started by Guido on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
We also know that Hibernate would raise a transient exception in the case where one would delete one to set the alarm.status property....
As : "ON UPDATE NO ACTION ON DELETE CASCADE;"
But there is no action=OnDeleteAction.SET_NULL
Moreover.
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<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="org.lexiclan.orm.dao"> <class name="Address...
Started by hal10001 on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
If you want to deleteI did not found any way to do it.... .
Either your properties, which means it has already been validated and has its properties as not-null.
"not-null" is not a conditional constraint.
To delete it from database.
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I have two classes: Family and Address. A family has a physical address and a mailing address.
The mapping file for Family looks like:
.... <id name="Id" column="Id" type="Int32" unsaved-value="0"> <generator class="native"></generator&...
Started by jeeradej on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
This behaviour.
But I think it would better to explicitly delete the related object.
It is only supported on lists (cascade="all-delete-orphan into a component.
Hibernate v3 in Java does support it).
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