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Operator overloading : member function vs. non-member function?
...d side of a binary operator. For example:
Foo f = 100;
int x = 10;
cout << x + f;
This only works if there is a global operator overload for
Foo operator + (int x, const Foo& f);
Note that the global operator overload doesn't necessarily need to be a friend function. This is onl...
Python constructors and __init__
...ou typically use them for is create variables for that object like this:
>>> class testing:
... def __init__(self, init_value):
... self.some_value = init_value
So what you could do then is to create an object from this class like this:
>>> testobject = testing(5)
...
Why is volatile not considered useful in multithreaded C or C++ programming?
...seem to be confused about the utility (or lack thereof) of volatile in multi-threaded programming contexts.
9 Answers
...
MySQL check if a table exists without throwing an exception
...ery("SHOW TABLES LIKE 'myTable'");
$tableExists = mysql_num_rows($result) > 0;
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How to set default value for form field in Symfony2?
...
Can be use during the creation easily with :
->add('myfield', 'text', array(
'label' => 'Field',
'empty_data' => 'Default value'
))
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What optimizations can GHC be expected to perform reliably?
... pragma. As an example, take a factorial function:
fac :: (Num a, Eq a) => a -> a
fac 0 = 1
fac n = n * fac (n - 1)
As the compiler doesn't know any properties of the multiplication that is to be used, it cannot optimize this at all. If however, it sees that it is used on an Int, it now can...
Access denied for user 'root@localhost' (using password:NO)
...steps.
enter the mysql command prompt
[root ~]# mysql -u root
mysql>
Fix the permission setting of the root user ;
mysql> use mysql;
Database changed
mysql> select * from user;
Empty set (0.00 sec)
mysql> truncate table user;
Query OK, 0 rows affected (0.00 sec)
mysql> flus...
JavaScript private methods
...prototype.publicFun = function () {
return privateFun.call(this, '>>');
}
return MyObject;
})();
var myObject = new MyObject('bar');
myObject.publicFun(); // Returns '>>bar'
myObject.privateFun('>>'); // ReferenceError: private is not defined
The call func...
Best practice for partial updates in a RESTful service
...ay that you can POST to to have it send an email or are you looking for mailto:customer.123@service.org?
– Jan Algermissen
Mar 14 '10 at 20:24
15
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How do I get a string format of the current date time, in python?
...duce string representation of dates and times with a format you specify.
>>> import datetime
>>> datetime.date.today().strftime("%B %d, %Y")
'July 23, 2010'
>>> datetime.datetime.now().strftime("%I:%M%p on %B %d, %Y")
'10:36AM on July 23, 2010'
...