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Counter increment in Bash loop not working
...variables local to the child process.
One way to solve it is using a temp file for storing the intermediate value:
TEMPFILE=/tmp/$$.tmp
echo 0 > $TEMPFILE
# Loop goes here
# Fetch the value and increase it
COUNTER=$[$(cat $TEMPFILE) + 1]
# Store the new value
echo $COUNTER > $TEMPF...
Any reason not to start using the HTML 5 doctype? [closed]
...
Well consider this:
When serving as text/html, all you need a doctype for is to trigger standards mode. Beyond that, the doctype does nothing as far as browsers are concerned.
When serving as text/html, whether you use XHTML markup ...
MongoDB: Is it possible to make a case-insensitive query?
...ance, I have a User table that has a username which is mixed case, but the id is an uppercase copy of the username. This ensures case-sensitive duplication is impossible (having both "Foo" and "foo" will not be allowed), and I can search by id = username.toUpperCase() to get a case-insensitive sear...
Qt: can't find -lGL error
... it is a library or only uses stdio), you need to specify that in the .pro file.
QT -= gui
And the linker won't attempt to find lGL regardless of whether it is installed.
My case is admittedly a bit odd, since the main reason to use Qt is to create gui's. Installing the GL library is certainly n...
When to use inline function and when not to use it?
...ll functions).
About performance, the wise approach is (as always) to profile the application, then eventually inline a set of functions representing a bottleneck.
References:
To Inline or Not To Inline
[9] Inline functions
Policies/Binary Compatibility Issues With C++
GotW #33: Inline
Inline R...
Exclude .svn directories from grep [duplicate]
... I grep my Subversion working copy directory, the results include a lot of files from the .svn directories. Is it possible to recursively grep a directory, but exclude all results from .svn directories?
...
Django rest framework nested self-referential objects
...e a serializer as a field on itself, but you can use these methods to override what fields are used by default.
class CategorySerializer(serializers.ModelSerializer):
parentCategory = serializers.PrimaryKeyRelatedField()
class Meta:
model = Category
fields = ('parentCategor...
HTTP status code for update and delete?
...hat should be the HTTP status code is the request sent by the client is valid (DELETE mySite/entity/123) and the entity to delete does not exist.
– Martin
Dec 30 '11 at 21:27
69
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What's the point of 'const' in the Haskell Prelude?
...o add to hammar's excellent direct answer: humble functions like const and id are really useful as a higher order function for the same reason that they are fundamental in the SKI combinator calculus.
Not that I think haskell's prelude functions were modeled consciously after that formal system or...
LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?
...eld } equals new { y.field } there is a compiler error. Functionally you didn't change anything. Using .Net 4.6.1.
– user2415376
Oct 28 '16 at 13:59
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