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Converting an int to std::string
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361
You can use std::to_string in C++11
int i = 3;
std::string str = std::to_string(i);
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How to get first record in each group using Linq
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answered Sep 25 '13 at 19:00
AlirezaAlireza
8,49033 gold badges3232 silver badges5555 bronze badges
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Java HashMap performance optimization / alternative
...ound 20,000 codes for 26 million distinct objects. That is an average of 1,300 objects per hash bucket = very very bad. However if I turn the two arrays into a number in base 52 I am guaranteed to get a unique hash code for every object:
public int hashCode() {
// assume that both a and ...
Why do some functions have underscores “__” before and after the function name?
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539
From the Python PEP 8 -- Style Guide for Python Code:
Descriptive: Naming Styles
The f...
Hibernate: Automatically creating/updating the db tables based on entity classes
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Steve Chambers
30.3k1313 gold badges121121 silver badges166166 bronze badges
answered Nov 20 '08 at 21:16
toolkittoo...
Significance of a .inl file in C++
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edited Jul 30 '09 at 17:35
answered Jul 30 '09 at 17:21
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How to convert a PIL Image into a numpy array?
...ld allow. I've figured out how to place the pixel information in a useful 3D numpy array by way of:
8 Answers
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What does the KEY keyword mean?
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193
Quoting from http://dev.mysql.com/doc/refman/5.1/en/create-table.html
{INDEX|KEY}
So KEY is a...
SQL UPDATE all values in a field with appended string CONCAT not working
...+
| id | data |
+------+-------+
| 1 | max |
| 2 | linda |
| 3 | sam |
| 4 | henry |
+------+-------+
4 rows in set (0.02 sec)
mysql> update t set data=concat(data, 'a');
Query OK, 4 rows affected (0.01 sec)
Rows matched: 4 Changed: 4 Warnings: 0
mysql> select * from t;
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How to get root view controller?
...ler = appDelegate.window!.rootViewController as YourViewController
Swift 3
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let viewController = appDelegate.window!.rootViewController as! YourViewController
Swift 4 & 4.2
let viewController = UIApplication.shared.keyWindow!....