大约有 15,510 项符合查询结果（耗时：0.0253秒） [XML]
Is “for(;;)” faster than “while (TRUE)”? If not, why do people use it?
...ompiler to compare any condition. Naively, with a while loop, it'd have to test true every iteration (obviously, not even the dumbest compiler would do that, but it's the principle that bothers me. It strikes me as overspecifying your code), while with a for(;;) you are literally saying "there is no...
How can I use “sizeof” in a preprocessor macro?
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The macro does not work in GNU gcc (tested at version 4.8.4) (Linux). At the ((void)sizeof(... it errors with expected identifier or '(' before 'void' and expected ')' before 'sizeof'. But in principle size_t x = (sizeof(... instead does work as intended. Yo...
Calculate MD5 checksum for a file
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I know that I am late to party but performed test before actually implement the solution.
I did perform test against inbuilt MD5 class and also md5sum.exe. In my case inbuilt class took 13 second where md5sum.exe too around 16-18 seconds in every run.
DateTime cur...
INSERT INTO vs SELECT INTO
...fine my table using CREATE TABLE and then INSERT INTO Also, it's easier to test the SELECT statement by itself, without executing the insert.
– Doug Chamberlain
Aug 4 '11 at 20:51
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Simplest way to check if key exists in object using CoffeeScript
... referring to keys, and in when referring to array values: val in arr will test whether val is in arr.)
thejh's answer is correct if you want to ignore the object's prototype. Jimmy's answer is correct if you want to ignore keys with a null or undefined value.
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I want to exception handle 'list index out of range.'
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You have two options; either handle the exception or test the length:
if len(dlist) > 1:
newlist.append(dlist[1])
continue
or
try:
newlist.append(dlist[1])
except IndexError:
pass
continue
Use the first if there often is no second item, the second if th...
How to link to a named anchor in Multimarkdown?
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I tested Github Flavored Markdown for a while and can summarize with four rules:
punctuation marks will be dropped
leading white spaces will be dropped
upper case will be converted to lower
spaces between letters will be conv...
Excel to CSV with UTF8 encoding [closed]
... - both these replace the accented characters with random junk characters. Tested for characters including é,è,â... Don't know if it's real UTF8 but the characters aren't mangled.
– user56reinstatemonica8
Jul 30 '13 at 16:28
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Rails bundle install production only
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Take a look at --without option:
bundle install --without development test
By default Bundler installs all gems and your application uses the gems that it needs. Bundler itself knows nothing about Rails and the current environment.
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efficient way to implement paging
...Linq, is actually just creating a SQL query for you in the background. To test this, just run SQL Profiler while your application is running.
The skip/take methodology has worked very well for me, and others from what I read.
Out of curiosity, what type of self-paging query do you have, that you ...