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What's so bad about Template Haskell?
... Tough luck, you'll only see that when actually using your code generator, and only under the circumstances that trigger the generation of that particular code. It is very difficult to unit test, too.
TH is also outright dangerous:
Code that runs at compile-time can do arbitrary IO, including la...
Effects of the extern keyword on C functions
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We have two files, foo.c and bar.c.
Here is foo.c
#include <stdio.h>
volatile unsigned int stop_now = 0;
extern void bar_function(void);
int main(void)
{
while (1) {
bar_function();
stop_now = 1;
}
return 0;
}
Now, here is...
Unable to generate an explicit migration in entity framework
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It tells you that there is some unprocessed migration in your application and it requires running Update-Database before you can add another migration.
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++someVariable vs. someVariable++ in JavaScript
... the value of the expression is the original value"
Now when used as a standalone statement, they mean the same thing:
x++;
++x;
The difference comes when you use the value of the expression elsewhere. For example:
x = 0;
y = array[x++]; // This will get array[0]
x = 0;
y = array[++x]; // Thi...
Meaning of @classmethod and @staticmethod for beginner? [duplicate]
Could someone explain to me the meaning of @classmethod and @staticmethod in python? I need to know the difference and the meaning.
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How to delete a module in Android Studio
Is there a way to delete a module within Android Studio?
When I right click on a module I can't find an option for deletion, is it elsewhere?
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How to test an SQL Update statement before running it?
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In addition to using a transaction as Imad has said (which should be mandatory anyway) you can also do a sanity check which rows are affected by running a select using the same WHERE clause as the UPDATE.
So if you UPDATE is
UPDATE foo
SET bar = 42
WHERE col1 = 1
AND col2 = 'foobar';
...
how to set “camera position” for 3d plots using python/matplotlib?
I'm learning how to use mplot3d to produce nice plots of 3d data and I'm pretty happy so far. What I am trying to do at the moment is a little animation of a rotating surface. For that purpose, I need to set a camera position for the 3D projection. I guess this must be possible since a surface can b...
How to save and load cookies using Python + Selenium WebDriver
...ogle.com")
pickle.dump( driver.get_cookies() , open("cookies.pkl","wb"))
and later to add them back:
import pickle
import selenium.webdriver
driver = selenium.webdriver.Firefox()
driver.get("http://www.google.com")
cookies = pickle.load(open("cookies.pkl", "rb"))
for cookie in cookies:
driv...
Recursive search and replace in text files on Mac and Linux
In the linux shell, the following command will recursively search and replace all instances of 'this' with 'that' (I don't have a Linux shell in front of me, but it should do).
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