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“unrecognized selector sent to instance” error in Objective-C
...ith ARC. I had the same error "unrecognized selector sent to instance". In my case I had a UIButton's target action set up to pass itself as the sender parameter, but later realised I didn't need it and removed that in code. So, something like:
- (IBAction)buttonPressed:(UIButton *)sender {
Was c...
How to get commit history for just one branch?
Let's say I created a new branch my_experiment from master and made several commits to my_experiment . If I do a git log when on my_experiment , I see the commits made to this branch, but also the commits made to master before the my_experiments branch was created.
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Change Volley timeout duration
I use the new Volley framework for Android to do a request to my server. But it timeouts before getting the response, although it does respond.
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Controlling maven final name of jar artifact
...t;2.3.2</version>
<configuration>
<finalName>myJar</finalName>
</configuration>
</plugin>
As indicated in the official documentation.
Update:
For Maven >= 3
Based on Matthew's comment you can now do it like this:
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Missing Maven dependencies in Eclipse project
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Well, I tried everything posted here, unfortunately nothings works in my case. So, trying different combinations I came out with this one that solved my problem.
1) Open the .classpath file at the root of your eclipse's project.
2) Insert the following entry to the file:
<classpathentry k...
Lost my schema.rb! Can it be regenerated?
...hema.rb in git. Somehow I have stuffed this up and somewhere along the way my schema.rb file has disappeared.
7 Answers
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How can my iphone app detect its own version number?
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As I describe here, I use a script to rewrite a header file with my current Subversion revision number. That revision number is stored in the kRevisionNumber constant. I can then access the version and revision number using something similar to the following:
[NSString stringWithFormat:...
stl 字符串std::string作为std::map主键key的实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...s_cmp_string;
};
int main()
{
std::map<std::string, std::string> my_map;
my_map.insert(std::make_pair("10", "china"));
my_map.insert(std::make_pair("20", "usa"));
my_map.insert(std::make_pair("30", "english"));
my_map.insert(std::make_pair("40", "hongkong"));
//...
How do I create a constant in Python?
...typing.Final variable annotation that will tell static type checkers (like mypy) that your variable shouldn't be reassigned. This is the closest equivalent to Java's final. However, it does not actually prevent reassignment:
from typing import Final
a: Final = 1
# Executes fine, but mypy will repo...
quick random row selection in Postgres
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You might want to experiment with OFFSET, as in
SELECT myid FROM mytable OFFSET floor(random()*N) LIMIT 1;
The N is the number of rows in mytable. You may need to first do a SELECT COUNT(*) to figure out the value of N.
Update (by Antony Hatchkins)
You must use floor here:
SE...