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Create a pointer to two-dimensional array
...e array, you cannot do as a shortcut
matrix_ptr[0][0][1] = ...;
Because indexing requires the element type's size to be known (indexing implies an addition of an integer to the pointer, so it won't work with incomplete types). Note that this only works in C, because T[] and T[N] are compatible ty...
Fastest way to iterate over all the chars in a String
...timized methods such as contains(predicate), forEach(consumer), forEachWithIndex(consumer). Thus, without the need for the user to know the length or repeat calls to String methods, these could help parsing libraries beep-beep beep speedup.
Keep dreaming :)
Happy Strings!
~SH
The test used the follo...
Angular.js ng-repeat across multiple tr's
...rid_ko{border-collapse:separate}
#tablegrid_ko tfoot,#tablegrid_ko thead{z-index:1}
#tablegrid_ko tbody{z-index:0}
#tablegrid_ko tr{height:20px}
#tablegrid_ko tr >td,#tablegrid_ko tr >th{
border-width:1px;border-style:outset;height:20px;
max-height:20px;xwidth:45px;xmin-width:45px;xmax-width:4...
Array.Copy vs Buffer.BlockCopy
...
Since the parameters to Buffer.BlockCopy are byte-based rather than index-based, you're more likely to screw up your code than if you use Array.Copy, so I would only use Buffer.BlockCopy in a performance-critical section of my code.
...
What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
... the array with a subscript of 0.
In other words, if you don't supply an index with [], you get the first element of the array:
foo=(a b c)
echo $foo
# a
Which is exactly the same as
foo=(a b c)
echo ${foo}
# a
To get all the elements of an array, you need to use @ as the index, e.g. ${foo[@...
In git, is there a way to show untracked stashed files without applying the stash?
...So the parents of the stash commit are (1. Commit stash is made against 2. Index 3. Untracked working copy), and the stash commit itself contains the tracked working copy? git stash show appears to show the diff between the working copy and #1 (relevant code from git-stash.sh: git diff ${FLAGS:---s...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...il='a@b.com', data='inserted data')
stmt = stmt.on_conflict_do_update(
index_elements=[my_table.c.user_email],
index_where=my_table.c.user_email.like('%@gmail.com'),
set_=dict(data=stmt.excluded.data)
)
conn.execute(stmt)
http://docs.sqlalchemy.org/en/latest/dialects/postgresql.htm...
Is GridFS fast and reliable enough for production?
...r.
Current data size : 11.23g
Current storage size : 12.5g
Indices : 5
Index size : 849.65m
About the reliability : This is very reliable. The server doesn't load, the index size is ok, queries are fast
About the speed : For sure, is it not fast as local file storage, maybe 10% slower, but fas...
Is it safe to remove selected keys from map within a range loop?
...n see from this playground play.golang.org/p/FwbsghzrsO . Note that if the index you delete is the first one in the range, it will still show that one since its already written to k,v but if you set the index to any besides the first one that range finds it will only display two key/value pairs inst...
Mongodb Explain for Aggregation framework
...}
)
An important consideration with the Aggregation Framework is that an index can only be used to fetch the initial data for a pipeline (e.g. usage of $match, $sort, $geonear at the beginning of a pipeline) as well as subsequent $lookup and $graphLookup stages. Once data has been fetched into t...