大约有 49,000 项符合查询结果（耗时：0.0481秒） [XML]
Maximum length of the textual representation of an IPv6 address?
I want to store the data returned by $_SERVER["REMOTE_ADDR"] in PHP into a DB field, pretty simple task, really. The problem is that I can't find any proper information about the maximum length of the textual representation of an IPv6 address, which is what a webserver provides through $_SERVER...
How to use “raise” keyword in Python [duplicate]
...dler, so that it can be handled further up the call stack.
try:
generate_exception()
except SomeException as e:
if not can_handle(e):
raise
handle_exception(e)
share
|
improve this answe...
What's the simplest way to test whether a number is a power of 2 in C++?
...a clever little bit hack to test that one and only one bit is set.
bool is_power_of_2(int x) {
return x > 0 && !(x & (x−1));
}
For more bit twiddling see here.
share
|
improv...
Quickly reading very large tables as dataframes
...rom csv/tab-delimited files directly into R. See mnel's answer.
Using read_table in readr (on CRAN from April 2015). This works much like fread above. The readme in the link explains the difference between the two functions (readr currently claims to be "1.5-2x slower" than data.table::fread).
r...
PHP Regex to get youtube video ID?
...
Use parse_url() and parse_str().
(You can use regexes for just about anything, but they are very easy to make an error in, so if there are PHP functions specifically for what you are trying to accomplish, use those.)
parse_url takes...
How do you use variables in a simple PostgreSQL script?
...e (http://www.postgresql.org/docs/9.1/static/sql-do.html )
DO $$
DECLARE v_List TEXT;
BEGIN
v_List := 'foobar' ;
SELECT *
FROM dbo.PubLists
WHERE Name = v_List;
-- ...
END $$;
Also you can get the last insert id:
DO $$
DECLARE lastid bigint;
BEGIN
INSERT INTO test (name) VALUES ('...
Making 'git log' ignore changes for certain paths
...ated pathspecs
Reported-by: John Millikin
Signed-off-by: Elijah Newren
do_match_pathspec() started life as match_pathspec_depth_1() and for correctness was only supposed to be called from match_pathspec_depth(). match_pathspec_depth() was later renamed to match_pathspec(), so the invariant we ex...
Android ViewPager - Show preview of page on left and right
...em visible
val nextItemVisiblePx = resources.getDimension(R.dimen.viewpager_next_item_visible)
val currentItemHorizontalMarginPx = resources.getDimension(R.dimen.viewpager_current_item_horizontal_margin)
val pageTranslationX = nextItemVisiblePx + currentItemHorizontalMarginPx
val pageTransformer = V...
What happens to a detached thread when main() exits?
...), and that's well-defined, as long as it touches neither (automatic|thread_local) variables of other threads nor static objects.
This appears to be allowed to allow thread managers as static objects (note in [basic.start.term]/4 says as much, thanks to @dyp for the pointer).
Problems arise when t...
How do I create a simple 'Hello World' module in Magento?
...les named as follows
cd /path/to/store/app
touch etc/modules/MyCompanyName_HelloWorld.xml
<?xml version="1.0"?>
<config>
<modules>
<MyCompanyName_HelloWorld>
<active>true</active>
<codePool>local</codePool>
...