大约有 30,000 项符合查询结果（耗时：0.0455秒） [XML]
What is move semantics?
...hape> a(new Triangle);
unique_ptr<Shape> b(a); // error
unique_ptr<Shape> c(make_triangle()); // okay
The second line fails to compile, because a is an lvalue, but the parameter unique_ptr&& source can only be bound to rvalues. This is exactly what we wante...
How do you organise multiple git repositories, so that all of them are backed up together?
With SVN, I had a single big repository I kept on a server, and checked-out on a few machines. This was a pretty good backup system, and allowed me easily work on any of the machines. I could checkout a specific project, commit and it updated the 'master' project, or I could checkout the entire thin...
Convert int to ASCII and back in Python
I'm working on making a URL shortener for my site, and my current plan (I'm open to suggestions) is to use a node ID to generate the shortened URL. So, in theory, node 26 might be short.com/z , node 1 might be short.com/a , node 52 might be short.com/Z , and node 104 might be short.com/ZZ . When...
Using ECMAScript 6
...avascript-harmony flag is set: /(?<!a)b/.test('ab') (and throw the next error if the flag is not set: "Uncaught SyntaxError: Invalid regular expression: /(?<!a)b/: Invalid group")
– Rob W
Dec 25 '16 at 11:25
...
The specified type member 'Date' is not supported in LINQ to Entities Exception
... a value. It looks as if Convert.ToDateTime(rule.data).Date is causing the error.
Calling Date on a DateTime property also cannot be translated to SQL, so a workaround is to compare the .Year .Month and .Day properties which can be translated to LINQ since they are only integers.
var ruleDate = C...
Postgres unique constraint vs index
... master values (0, 0);
INSERT 0 1
test=# insert into master values (0, 1);
ERROR: duplicate key value violates unique constraint "master_con_id_key"
DETAIL: Key (con_id)=(0) already exists.
test=# insert into master values (1, 0);
ERROR: duplicate key value violates unique constraint "master_uniq...
Writing outputs to log file and console
... running the user script like log file name and path, redirect outputs and errors to log file, database connection details, etc ) which redirects all the outputs ( echo messages ) and errors to the log file from the executed script using the following code:
...
git stash apply version
...sh won't overwrite your working directory changes if it does you'll get an error:
error: Your local changes to the following files would be overwritten by merge:
file
Please commit your changes or stash them before you merge.
In versions prior to 1.7.5.1, it refused to work if there was a...
What is the best way to uninstall gems from a rails3 project?
...ndler:
bundle exec gem uninstall GEM_NAME
Note that this throws
ERROR: While executing gem ... (NoMethodError) undefined method `delete' for #<Bundler::SpecSet:0x00000101142268>
but the gem is actually removed. Next time you run bundle install the gem will be reinstalled.
...
How to convert URL parameters to a JavaScript object?
I have a string like this:
30 Answers
30
...