大约有 48,000 项符合查询结果（耗时：0.0617秒） [XML]
Coding Practices which enable the compiler/optimizer to make a faster program
... the performance factor, count the number of instructions in the overhead (minimum 3: increment, check, goto start of loop) and divide by the number of statements inside the loop. The lower the number the better.
Edit: provide an example of loop unrolling
Before:
unsigned int sum = 0;
for (si...
Difference between partition key, composite key and clustering key in Cassandra?
... 10 | ex-football player
Important note: the partition key is the minimum-specifier needed to perform a query using a where clause.
If you have a composite partition key, like the following
eg: PRIMARY KEY((col1, col2), col10, col4))
You can perform query only by passing at least both col...
Postgres dump of only parts of tables for a dev snapshot
...TEMPLATE product_snapshot_XX. I of course widdled the data down to a bare minimum so the product snapshot loaded and test db creation operations are fast enough to not be a team impediment.
– Trey
Nov 18 '09 at 2:00
...
Is it possible to run JavaFX applications on iOS, Android or Windows Phone 8?
...our project without worrying. But, since JavaFXPorts just gives you a bare minimum support (no IDE support+no Mobile controls), I would be skeptical to choose it for something commercial. Gluon Mobile is free to use, it just has an Nag screen when your application starts (for free version). But, you...
Can scrapy be used to scrape dynamic content from websites that are using AJAX?
...return None
return wrapper
for wrapper to work all spiders must have at minimum:
middleware = set([])
to include a middleware:
middleware = set([MyProj.middleware.ModuleName.ClassName])
Advantage:
The main advantage to implementing it this way rather than in the spider is that you only end...
Java Regex Capturing Groups
...good explanation. So the reluctant starts from the left and just takes the minimum whereas with the greedy, it will take as much as possible (starting from the right), only stopping before the last digit to satisfy that condition. The third group takes the rest.
– Xivilai
...
Java: Difference between the setPreferredSize() and setSize() methods in components
...ent layout manager does not exist;
setPreferredSize() (also its related setMinimumSize and setMaximumSize) -- use when a parent layout manager exists.
The setSize() method probably won't do anything if the component's parent is using a layout manager; the places this will typically have an effect w...
Comma separator for numbers in R?
...mebrs are quite different. From help "Numeric vectors are encoded with the minimum number of decimal places needed to display all the elements to at least the digits significant digits. However, if all the elements then have trailing zeroes, the number of decimal places is reduced until nsmall"
...
Can I change the viewport meta tag in mobile safari on the fly?
... name="viewport"
content="width=1024, height=768, initial-scale=0, minimum-scale=0.25" />
somewhere in your javascript
document.getElementById("viewport").setAttribute("content",
"initial-scale=0.5; maximum-scale=1.0; user-scalable=0;");
... but good luck with tweaking it for y...
Why does CSS work with fake elements?
...n amalgam of different "engines" that have specific jobs to do. At a bare minimum I can think of 3 engines, the rendering engine, the CSS engine, and the javascript engine/VM. Not sure if the parser is part of the rendering engine (or vice versa) or if it is a separate engine, but you get the idea...