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“unpacking” a tuple to call a matching function pointer
...le:
int main()
{
std::tuple<int, double, int*> t;
//or std::array<int, 3> t;
//or std::pair<int, double> t;
call(f, t);
}
DEMO
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How to execute IN() SQL queries with Spring's JDBCTemplate effectivly?
....goodsid FROM beiker_goods bg WHERE bg.goodsid IN (:goodsid)";
List ids = Arrays.asList(new Integer[]{12496,12497,12498,12499});
Map<String, List> paramMap = Collections.singletonMap("goodsid", ids);
NamedParameterJdbcTemplate template =
new NamedParameterJdbcTemplate(getJdbcTemplate().g...
How expensive is the lock statement?
...llections, I have developed spin locked collections of my own around list, array, dictionary and queue, as I needed little more control and sometimes some code running under spinlock. I can tell you, it is possible and allows to solve multiple scenarios TPL collections can not do and with great per...
Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
.... of 7 runs, 1000 loops each)
A column is basically a Series i.e a NumPy array, it can be indexed without any cost. For folks interested in how the underlying memory organization plays into execution speed here is a great Link on Speeding up Pandas:
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What do the &,
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These represent node references (*) and associative array merges (<<) that refer to a node labeled with an anchor (&) tag -- wikipedia
Try it out yourself online.
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Signed to unsigned conversion in C - is it always safe?
...hout a hint. You don't want to cast to an unsigned and then use that as an array index.
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List of encodings that Node.js supports
... converting back to bytes will yield the original bytes. Use a Buffer/Uint8Array for binary data.
– phihag
Sep 14 '19 at 22:12
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Using Excel OleDb to get sheet names IN SHEET ORDER
...ws.Count];
int i = 0;
// Add the sheet name to the string array.
foreach(DataRow row in dt.Rows)
{
excelSheets[i] = row["TABLE_NAME"].ToString();
i++;
}
// Loop through all of the sheets if you want too...
for(int j=0; j...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
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You can squeeze the array into somewhat fewer than 256 bytes if you ignore palindromes.
– wilhelmtell
Apr 8 '10 at 19:56
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What is a handle in C++?
... return something->doit(a, b);
}
Or it uses it as an index to an array/vector:
int doSomething(HANDLE s, int a, int b) {
int index = (int)s;
try {
Something& something = vecSomething[index];
return something.doit(a, b);
} catch (boundscheck& e) {
...