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Objective-C declared @property attributes (nonatomic, copy, strong, weak)
...tching of data)
Copy
copy is required when the object is mutable. Use this if you need the value of the object as it is at this moment, and you don't want that value to reflect any changes made by other owners of the object. You will need to release the object when you are finished with it because y...
Adding a new value to an existing ENUM Type
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NOTE if you're using PostgreSQL 9.1 or later, and you are ok with making changes outside of a transaction, see this answer for a simpler approach.
I had the same problem few days ago and found this post. So my answer can be hel...
__declspec(dllexport) 导出符号解决链接失败问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
__declspec(dllexport) 导出符号解决链接失败问题特别注意：dllexport、dllimport导出、导入的方式仅针对dll动态库，而lib静态库无需任何申明，宏全部替换成空即可。error LNK2019: 无法解析的外部符号 "public: __thiscall CBtt::CBtt(void)" (??0CBtt@@Q...
How to implement the Android ActionBar back button?
...ress the back button. This should be done in the AndroidManifest.xml too.
Now you can enable the back button in the onCreate method of your "child" activity.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActionBar().setDisplayHomeAsUp...
How do I calculate square root in Python?
...tance, x(0) in the second.
So it's not wrong, it's the right answer to a different question.
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Changing password with Oracle SQL Developer
...pdating the password using SQL Developer is:
alter user user_name identified by new_password replace
old_password ;
You can check more options for this command here: ALTER USER-Oracle DOCS
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Subprocess changing directory
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To run your_command as a subprocess in a different directory, pass cwd parameter, as suggested in @wim's answer:
import subprocess
subprocess.check_call(['your_command', 'arg 1', 'arg 2'], cwd=working_dir)
A child process can't change its parent's working directo...
Ruby replace string with captured regex pattern
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Note that this only works if the replacement string is inside single quotes. I wasted 5 minutes figuring that out.
– Vicky Chijwani
Feb 9 '13 at 0:30
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Set the value of a variable with the result of a command in a Windows batch file
...t foobar=%%a
But, I instead suggest using Cygwin on your Windows system if you are used to Unix-type scripting.
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Double Negation in C++
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@Noldorin, I think it improves readability - if you know what it means, it is simple, neat and logical.
– jwg
Jun 4 '14 at 9:45
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