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What is the difference between a var and val definition in Scala?
...ry if some other part of your code is changing it. For example:
x = new B(0)
f(x)
if (x.value.value == 0)
println("f didn't do anything to x")
else
println("f did something to x")
This becomes particularly important with multithreaded systems. In a multithreaded system, the following can happ...
Class JavaLaunchHelper is implemented in both … libinstrument.dylib. One of the two will be used. Wh
I upgraded to the latest Java 7u40 on MacOS X and started getting the following message on the console when launching my application using Eclipse. The app works fine but I would like to find out the cause of the problem and hopefully a fix for it.
...
Python timedelta in years
...
answered Apr 19 '09 at 20:05
Rick CopelandRick Copeland
10.5k44 gold badges3636 silver badges3838 bronze badges
...
What does tree-ish mean in Git?
...-----------------------------
| 1. <sha1> | dae86e1950b1277e545cee180551750029cfe735
| 2. <describeOutput> | v1.7.4.2-679-g3bee7fb
| 3. <refname> | master, heads/master, refs/heads/master
| 4. <refname>@{<date>} | master@{yesterday...
How to use performSelector:withObject:afterDelay: with primitive types in Cocoa?
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answered Nov 14 '09 at 17:58
MortyMorty
1,2181111 silver badges1010 bronze badges
...
Modern way to filter STL container?
...
110
See the example from cplusplus.com for std::copy_if:
std::vector<int> foo = {25,15,5,-5,-...
How to get the instance id from within an ec2 instance?
...in availability-zone'
EC2_REGION="`echo \"$EC2_AVAIL_ZONE\" | sed -e 's:\([0-9][0-9]*\)[a-z]*\$:\\1:'`"
You may also use curl instead of wget, depending on what is installed on your platform.
share
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Retrieve only the queried element in an object array in MongoDB collection
...d shapes element:
db.test.find(
{"shapes.color": "red"},
{_id: 0, shapes: {$elemMatch: {color: "red"}}});
Returns:
{"shapes" : [{"shape": "circle", "color": "red"}]}
In 2.2 you can also do this using the $ projection operator, where the $ in a projection object field name represents...
Integer to hex string in C++
...esult( stream.str() );
You can prepend the first << with << "0x" or whatever you like if you wish.
Other manips of interest are std::oct (octal) and std::dec (back to decimal).
One problem you may encounter is the fact that this produces the exact amount of digits needed to represent...
Performing Inserts and Updates with Dapper
...
209
We are looking at building a few helpers, still deciding on APIs and if this goes in core or no...