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What is ?= in Makefile
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?= indicates to set the KDIR variable only if it's not set/doesn't have a value.
For example:
KDIR ?= "foo"
KDIR ?= "bar"
test:
echo $(KDIR)
Would print "foo"
GNU manual: http://www.gnu.org/software/make/manual/html_node/Setting.ht...
Case in Select Statement
...he searched CASE expression allows for values to be replaced in the result set based on comparison values. The following example displays the list price as a text comment based on the price range for a product.
USE AdventureWorks2012;
GO
SELECT ProductNumber, Name, "Price Range" =
CASE
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Using CookieContainer with WebClient class
...populate the Cookie header before making the request and then pull out the Set-Cookies header on the response. There are helper methods on the CookieContainer class which make creating and parsing these headers easier: CookieContainer.SetCookies() and CookieContainer.GetCookieHeader(), respectively....
select and update database record with a single queryset
How do I run an update and select statements on the same queryset rather than having to do two queries:
- one to select the object
- and one to update the object
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How find all unused classes in Intellij Idea?
...mand+Shift+A)
Enter "unused declar"
Double-click on "Unused declaration"
Settings will pop up
Click on Java/Declaration redundancy/Unused declaration
on the right bottom select "On the fly editor settings"
untick check fields, ..., check parameters. Only Check Classes should be ticked.
Press OK
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Is there a “vim runtime log”?
...h is better in my opinion because it's simpler, only in the cmd, and I can set a path to the log each time I run it, and I don't need to "inflate" my vimrc. And welcome to SO!
– Somebody still uses you MS-DOS
Jun 11 '10 at 21:47
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In HTML5, is the localStorage object isolated per page/domain?
...and host). From the spec:
Each top-level browsing context has a unique set of session storage areas, one for each origin.
Thus, the storage for http://a.example.com and the storage for http://b.example.com are separate (and they're both separate from http://example.com) as those are all differ...
Purpose of Trigraph sequences in C++?
...phs) has the answer.
It boils down to the fact that the ISO 646 character set doesn't have all the characters of the C syntax, so there are some systems with keyboards and displays that can't deal with the characters (though I imagine that these are quite rare nowadays).
In general, you don't need...
Setting individual axis limits with facet_wrap and scales = “free” in ggplot2
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You can also specify the range with the coord_cartesian command to set the y-axis range that you want, an like in the previous post use scales = free_x
p <- ggplot(plot, aes(x = pred, y = value)) +
geom_point(size = 2.5) +
theme_bw()+
coord_cartesian(ylim = c(-20, 80))
p ...
How to add a local repo and treat it as a remote repo
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This is my first post here so please advise what should be improved.
## SETUP LOCAL GIT REPO WITH A LOCAL REMOTE
# the main elements:
# - remote repo must be initialized with --bare parameter
# - local repo must be initialized
# - local repo must have at least one commit that properly initializes...