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Updating packages in Emacs
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In order to automatically update the list of packages, only if there is no package list already, use the following:
(when (not package-archive-contents)
(package-refresh-contents))
In order to update all installed package...
How to convert timestamp to datetime in MySQL?
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DATE_FORMAT(FROM_UNIXTIME(`orderdate`), '%Y-%m-%d %H:%i:%s') as "Date" FROM `orders`
This is the ultimate solution if the given date is in encoded format like 1300464000
shar...
glVertexAttribPointer clarification
...an attribute is enabled, you need to define the data it's going to use. In order to do so you need to bind your VBO - glBindBuffer(GL_ARRAY_BUFFER, myBuffer);.
And now we can define the attribute - glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);. In order of parameter: 0 is the attribute you'...
AtomicInteger lazySet vs. set
... structures. The semantics are
that the write is guaranteed not to be re-ordered with any
previous write, but may be reordered with subsequent operations
(or equivalently, might not be visible to other threads) until
some other volatile write or synchronizing action occurs).
The main us...
MySQL DISTINCT on a GROUP_CONCAT()
...UP_CONCAT has DISTINCT attribute:
SELECT GROUP_CONCAT(DISTINCT categories ORDER BY categories ASC SEPARATOR ' ') FROM table
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CSS two divs next to each other
...e two divs in a container, and using the display: inline-block property in order to have the divs align, as some of the other answers have suggested. I am not criticizing anyone, as we're all here to help each other, so beside my nit picking, thank you M.N. for your contributions to this community.
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Cannot truncate table because it is being referenced by a FOREIGN KEY constraint?
... to call this stored procedure multiple times on all tables in the correct order
For the benefit of the public here is the updated script :
CREATE PROCEDURE [dbo].[truncate_non_empty_table]
@TableToTruncate VARCHAR(64)
AS
BEGIN
SET NOCOUNT ON
-- GLOBAL VARIABLES
DECLARE @i...
std::function and std::bind: what are they, and when should they be used?
...n occasional use that isn't partial function application, bind can also re-order the arguments to a function:
auto memcpy_with_the_parameters_in_the_right_flipping_order = bind(memcpy, _2, _1, _3);
I don't recommend using it just because you don't like the API, but it has potential practical uses...
CSS transition shorthand with multiple properties?
...0vw;
opacity: 0;
transition-property: max-width, opacity; // relative order
transition-duration: 2s, 4s; // effects relatively ordered animation properties
transition-delay: 6s; // effects delay of all animation properties
animation-timing-function: ease;
&:hover {
max-width: 1...
Difference between binary semaphore and mutex
...t So Can we say that Mutex are Used for atomicity and Binary Semaphore for Ordering perspective since Task B will be waiting for Task A to signal the release of lock inherently making sure of ordering of operations on a data strurcture?
– abhi
Feb 23 '14 at 9:1...