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Overloading member access operators ->, .*
...nter dereference operator, or it must return a pointer that can be used to select what the pointer dereference operator arrow is pointing at."
Bruce Eckel: Thinking CPP Vol-one : operator->
The extra functionality is provided for convenience, so you do not have to call
a->->func();
You ...
Is “IF” expensive?
...nation on Cell Performance. Another fun one is this post about branchless selections on the Real Time Collision Detection Blog.
In addition to the excellent answers already posted in response to this question, I'd like to put in a reminder that although "if" statements are considered expensive low...
JdbcTemplate queryForInt/Long is deprecated in Spring 3.2.2. What should it be replaced by?
...
public int getCircleCount() {
Object param = "1";
String sql = "select count(*) from circle where id = ? ";
jdbcTemplate.setDataSource(getDataSource());
int result = getJdbcTemplate().queryForObject(sql, new Object[] { param }, Integer.class);
return result;
}
...
B-Tree vs Hash Table
...faster than with a tree algorithm (O(1) instead of log(n)), but you cannot select ranges (everything in between x and y).
Tree algorithms support this in Log(n) whereas hash indexes can result in a full table scan O(n).
Also the constant overhead of hash indexes is usually bigger (which is no factor...
What are the differences between Deferred, Promise and Future in JavaScript?
...
These answers, including the selected answer, are good for introducing promises
conceptually, but lacking in specifics of what exactly the differences are in
the terminology that arises when using libraries implementing them (and there
are important diff...
How do I remove diacritics (accents) from a string in .NET?
...gory(c)
where uc != UnicodeCategory.NonSpacingMark
select c;
var cleanStr = new string(chars.ToArray()).Normalize(NormalizationForm.FormC);
return cleanStr;
}
// or, alternatively
public static string RemoveDiacriti
Create Pandas DataFrame from a string
...ork is to copy-and-paste the text by loading the data from the clipboard.
Select the content of the string with your mouse:
In the Python shell use read_clipboard()
>>> pd.read_clipboard()
col1;col2;col3
0 1;4.4;99
1 2;4.5;200
2 3;4.7;65
3 4;3.2;140
Use the ap...
How to cherry pick a range of commits and merge into another branch?
...
@aug -m is supposed to handle them for you, by selecting the mainline referenced by the -m parameter you have chosen for this cherry-picking.
– VonC
Jul 14 '16 at 19:20
...
How to extract the decision rules from scikit-learn decision-tree?
... recursive partitioning. There is nothing preventing a variable from being selected multiple times.
– Zelazny7
Mar 1 '17 at 17:25
...
Rails: FATAL - Peer authentication failed for user (PG::Error)
...o check the version of postgres if multiple versions are available
psql=# select VERSION();
PostgreSQL 9.1.13 on x86_64-unk.... # so version is 9.1
Now Open postgres user
vim /etc/postgresql/9.1/main/pg_hba.conf
9.1 is version return form upper command
and replace
local all ...