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What is the correct way of using C++11's range-based for?
...f using for (const auto& x : v) just fails to compile.
g++ outputs an error message something like this:
TestRangeFor.cpp:138:11: error: assignment of read-only reference 'x'
x *= 10;
^
The correct approach in this case is capturing by non-const reference:
vector<...
MySQL root access from all hosts
... This is not the perfect solution. It may work. For me it produced an error: ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY'
– Scriptlabs
Nov 16 '15 at 12:51
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How do I install the yaml package for Python?
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On Ubuntu 14.04 LTS, I got the error libyaml is not found or a compiler error: forcing --without-libyaml when using sudo pip install PyYAML. What should I do? Thanks.
– hengxin
Jul 23 '14 at 11:26
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Xcode source automatic formatting
...iguration.
Objective-Clean (paid, didn't try it yet) - app raising build errors if predefined style rules are violated - possibly quite hard to use within the team, so I didn't try it out.
With very minimal setup, you can get Xcode to use our App to enforce
your rules. If you are ever caught...
PHP PDO returning single row
...ence. If something goes wrong with query, depending on how you've got your error handling set up, it will either throw an Exception (desired, in my opinion) or you'll get an Invalid object method reference "fetch" on "false".... error, a form of which you would have gotten anyway because the query o...
Why is access to the path denied?
...eadonly (since you do actually have access to the path!) In my opinion the error message should be changed. Thanks for the hint anyways!
– MBoros
Feb 19 '14 at 13:57
1
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How can you undo the last git add?
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Generates (for me) the error: fatal: Failed to resolve 'HEAD' as a valid ref. I haven't committed anything yet (new repo) just done git add . and regretted it. I don't want to reset the entire add, just one directory. git reset -- dir/*.* generates...
Add unique constraint to combination of two columns
...tions are expensive).
http://www.sqlperformance.com/2012/08/t-sql-queries/error-handling
http://www.mssqltips.com/sqlservertip/2632/checking-for-potential-constraint-violations-before-entering-sql-server-try-and-catch-logic/
If you want to prevent exceptions from bubbling up to the application, w...
What's the fastest way to loop through an array in JavaScript?
...e better performance, writing code that is less legible and more prone to errors than a simple straightforward for loop. Therefore, I recommend:
If your app iterates over a lot of items or your loop code is inside a function that is used often, a straightforward for loop is the answer:
for (var ...
How to delete an object by id with entity framework
...ur entity in the context because if you don't do that, you will receive an error while removing. EF can remove entities in this context only
– Pierre-Luc
Jan 9 '19 at 14:43
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