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Big-O for Eight Year Olds? [duplicate]
I'm asking more about what this means to my code. I understand the concepts mathematically, I just have a hard time wrapping my head around what they mean conceptually. For example, if one were to perform an O(1) operation on a data structure, I understand that the number of operations it has to p...
Change private static final field using Java reflection
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Assuming no SecurityManager is preventing you from doing this, you can use setAccessible to get around private and resetting the modifier to get rid of final, and actually modify a private static final field.
Here's an example:
import java.lang.reflect....
Redis - Connect to Remote Server
I've just install Redis succesfully using the instructions on the Quick Start guide on http://redis.io/topics/quickstart on my Ubuntu 10.10 server. I'm running the service as dameon (so it can be run by init.d)
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127 Return code from $?
What is the meaning of return value 127 from $? in UNIX.
8 Answers
8
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g++ undefined reference to typeinfo
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One possible reason is because you are declaring a virtual function without defining it.
When you declare it without defining it in the same compilation unit, you're indicating that it's defined somewhere else - this means the linker phase will...
remove None value from a list without removing the 0 value
This was my source I started with.
10 Answers
10
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How do I print the type of a variable in Rust?
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If you merely wish to find out the type of a variable and are willing to do it at compile time, you can cause an error and get the compiler to pick it up.
For example, set the variable to a type which doesn't work:
let mut my_number: () =...
C# operator overload for `+=`?
... MSDN:
Assignment operators cannot be overloaded, but +=, for example, is evaluated using +, which can be overloaded.
Even more, none of assignment operators can be overloaded. I think this is because there will be an effect for the Garbage collection and memory management, which is a potenti...
What are Runtime.getRuntime().totalMemory() and freeMemory()?
...Runtime.getRuntime().freeMemory() , and Runtime.getRuntime().maxMemory() is.
7 Answers
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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
....53s 1.52s -Os
In some cases you can alleviate the effect of disadvantageous optimizations by asking gcc to optimize for your particular processor (using options -mtune=native or -march=native):
Processor Compiler Time (-O2 -mtune=native) Time (-Os -mtune=native)
AMD FX-63...