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What is a C++ delegate?
... fp = &f;
int a = fp(3.14);
Option 4: pointer to member functions (fastest solution)
See Fast C++ Delegate (on The Code Project).
struct DelegateList
{
int f1(double d) { }
int f2(double d) { }
};
typedef int (DelegateList::* DelegateType)(double d);
DelegateType d = &Deleg...
Is Redis just a cache?
...
Redis has unique abilities like ultra-fast lua-scripts. Its execution time equals to C commands execution. This also brings atomicity for sophisticated Redis data manipulation required for work many advanced objects like Locks and Semaphores.
There is a Redis ba...
Getter and Setter?
...tures, in many IDE (even vim) : auto-completion, explicit PHP inheritance, fast PHP interpretation & usefull PHPDoc generation & output. cf. stackoverflow.com/a/6184893/490589
– Ronan
Jul 1 '13 at 20:33
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What is Express.js?
...nes of code.
What is Redis? Does it come with Express.js?
Redis is a fast persistent key-value storage. You can optionally use it for storing sessions with Express.js, but you don't need to. By default, Express.js has memory storage for sessions. Redis also can be use for queueing jobs, for ex...
Difference between “on-heap” and “off-heap”
...managed in memory, it is slightly slower than the on-heap store, but still faster than the disk store.
The internal details involved in management and usage of the off-heap store aren't very evident in the link posted in the question, so it would be wise to check out the details of Terracotta BigMe...
Is R's apply family more than syntactic sugar?
...nctions (e.g. for). One exception to this is lapply which can be a little faster because it does more work in C code than in R (see this question for an example of this).
But in general, the rule is that you should use an apply function for clarity, not for performance.
I would add to this th...
Fastest way(s) to move the cursor on a terminal command line?
...ckward search.
I recommend the second option. Ctrl+r is really handy and fast, no mucking about with editors, and you see the results before the command is run (unlike the history expansions).
share
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Why does the order of the loops affect performance when iterating over a 2D array?
... (2) modifying all of them, (3) repeat 4000*4000/16 times. That's nice and fast, and the CPU always has something to work on.
The first example is (1) grab a chunk of 16 ints, (2) modify only one of them, (3) repeat 4000*4000 times. That's going to require 16 times the number of "fetches" from memo...
What are the underlying data structures used for Redis?
...ng a small O(N) blob is cache oblivious so practically speaking it is very fast, and when there are too many elements the encoding is automatically switched to the native encoding (linked list, hash, and so forth).
But your question was not really just about internals, your point was What type to u...
Why is a boolean 1 byte and not 1 bit of size?
...uld agree that bitwise operations are slow. ands, nots, xors etc are very fast. It is typically the implementation of the bitwise operations that are slow. At the machine level they are quite fast. Branching... now that is slow.
– Hogan
Jan 7 '11 at 15:07
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