大约有 45,000 项符合查询结果（耗时：0.0570秒） [XML]
When should I use mmap for file access?
...e mmap can be awkward is if you need to work with very large files on a 32 bit machine. This is because mmap has to find a contiguous block of addresses in your process's address space that is large enough to fit the entire range of the file being mapped. This can become a problem if your address ...
Check if all values of array are equal
...
might be a bit late to the party... i think this doesn't work if your array is made of falses! for example try [false, false, false].reduce(function(a, b){return (a === b)?a:false;});
– George Flourentzos
...
How do I break a string over multiple lines?
...
1041
Using yaml folded style, each line break is replaced by a space. The indention in each line w...
Export database schema into SQL file
...NAME
,@schema sysname
,@TableName SYSNAME
,@IncludeConstraints BIT = 1
,@IncludeIndexes BIT = 1
,@NewTableSchema sysname
,@NewTableName SYSNAME = NULL
,@UseSystemDataTypes BIT = 0
,@script varchar(max) output
AS
BEGIN try
if not exists (select * from sys.types wh...
bundle install fails with SSL certificate verification error
...
This is also pointed to in the error message "...see bit.ly/ruby-ssl".
– IAmNaN
Oct 4 '13 at 18:10
...
How can I determine whether a 2D Point is within a Polygon?
...st a larger number of points, you can certainly speed up the whole thing a bit by keeping the linear equation standard forms of the polygon sides in memory, so you don't have to recalculate these every time. This will save you two floating point multiplications and three floating point subtractions ...
Command to get nth line of STDOUT
...
Using two processes to filter the data is a bit of overkill (but, given the power of machines these days, they'd probably cope). Generalizing to handle one range is not wholly trivial (for range N..M, you use head -n M | tail -n M-N+1), and generalizing to handle mult...
How to call an external command?
...w do you call an external command (as if I'd typed it at the Unix shell or Windows command prompt) from within a Python script?
...
GCC dump preprocessor defines
...
Late answer - I found the other answers useful - and wanted to add a bit extra.
How do I dump preprocessor macros coming from a particular header file?
echo "#include <sys/socket.h>" | gcc -E -dM -
or (thanks to @mymedia for the suggestion):
gcc -E -dM -include sys/socket.h - <...
How to get number of entries in a Lua table?
...
return count
end
Also, notice that the "#" operator's definition is a bit more complicated than that. Let me illustrate that by taking this table:
t = {1,2,3}
t[5] = 1
t[9] = 1
According to the manual, any of 3, 5 and 9 are valid results for #t. The only sane way to use it is with arrays of ...