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内存调试技巧：C 语言最大难点揭秘 - C/C++ - 清泛网 - 专注C/C++及内核技术
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* While this function uses heap memory, and so
* temporarily might expand the over-all memory
* footprint, it properly cleans up after itself.
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int f6(char *item1)
{
my_class c1;
int result;
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c1 ...
Select rows of a matrix that meet a condition
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This is easier to do if you convert your matrix to a data frame using as.data.frame(). In that case the previous answers (using subset or m$three) will work, otherwise they will not.
To perform the operation on a matrix, you can define a column by nam...
Random Number Between 2 Double Numbers
Is it possible to generate a random number between 2 doubles?
12 Answers
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How to get the ThreadPoolExecutor to increase threads to max before queueing?
... this limitation in ThreadPoolExecutor where the queue needs to be bounded and full before more threads will be started.
I believe I have finally found a somewhat elegant (maybe a little hacky) solution to this limitation with ThreadPoolExecutor. It involves extending LinkedBlockingQueue to have ...
Android. Fragment getActivity() sometimes returns null
...ole error reports sometimes I see reports with NPE issue. I do not understand what is wrong with my code. On emulator and my device application works good without forcecloses, however some users get NullPointerException in fragment class when the getActivity() method is called.
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Log all queries in mysql
... has now a 'tracking' option for tables where you specify a log('version') and it will keep record of the queries affecting it with information about time and the whole query.
– gadget00
Aug 7 '13 at 14:57
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Can you do greater than comparison on a date in a Rails 3 search?
... > ?", p[:date]).
order('date ASC, created_at ASC')
or you can also convert everything into the SQL notation
Note.
where("user_id = ? AND notetype = ? AND date > ?", current_user.id, p[:note_type], p[:date]).
order('date ASC, created_at ASC')
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How do I display an alert dialog on Android?
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You could use an AlertDialog for this and construct one using its Builder class. The example below uses the default constructor that only takes in a Context since the dialog will inherit the proper theme from the Context you pass in, but there's also a constructo...
Is there a Null OutputStream in Java?
... I think Java 11 has only been out for one week.
– Brandon Yarbrough
Oct 5 '18 at 21:04
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PostgreSQL wildcard LIKE for any of a list of words
... I think using lower() is ineffective because it will first convert each string to lowercase, which is more costly than only a case-insensitive match
– gilad mayani
Sep 20 '19 at 10:57
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