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Can I set a breakpoint on 'memory access' in GDB?
...
What you're looking for is called a watchpoint.
Usage
(gdb) watch foo: watch the value of variable foo
(gdb) watch *(int*)0x12345678: watch the value pointed by an address, casted to whatever type you want
(gdb) watch a*b + c/d: watch an arbitrarily complex expression, valid in the progra...
Creating functions in a loop
...have a function that accesses a global variable, like this:
global_var = 'foo'
def my_function():
print(global_var)
global_var = 'bar'
my_function()
When you read this code, you would - of course - expect it to print "bar", not "foo", because the value of global_var has changed after the fu...
Process all arguments except the first one (in a bash script)
...
Surprisingly foo=shift doesn't do what I'd expect.
– Keith Smiley
Mar 3 '14 at 16:45
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What is a “first chance exception”?
...atement that throws. You see the message A first chance exception of type 'foo' occurred in YourApp.exe. You can still continue (F5) or step further (F11). Then if there is a catch for this, control goes there. If there is no catch block, you get the "second-chance" break, this time the message is A...
How can I get the sha1 hash of a string in node.js?
... = require('crypto')
var shasum = crypto.createHash('sha1')
shasum.update('foo')
shasum.digest('hex') // => "0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33"
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Variable number of arguments in C++?
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in c++11 you can do:
void foo(const std::list<std::string> & myArguments) {
//do whatever you want, with all the convenience of lists
}
foo({"arg1","arg2"});
list initializer FTW!
...
What does “xmlns” in XML mean?
....com/apk/res/android"
In the document, you see elements like: <android:foo />
Think of the namespace prefix as a variable with a short name alias for the full namespace URI. It is the equivalent of writing <http://schemas.android.com/apk/res/android:foo /> with regards to what it "mea...
How to convert a dictionary to query string in Python?
...ightly different:
from urllib.parse import urlencode
urlencode({'pram1': 'foo', 'param2': 'bar'})
output: 'pram1=foo&param2=bar'
for python2 and python3 compatibility, try this:
try:
#python2
from urllib import urlencode
except ImportError:
#python3
from urllib.parse import ...
Retain cycle on `self` with blocks
...ject {…}
- (void) encodeVideoAndCall: (Callback) block;
@end
@interface Foo : NSObject {…}
@property(retain) VideoEncoder *encoder;
@end
@implementation Foo
- (void) somewhere {
[encoder encodeVideoAndCall:^{
[self doSomething];
}];
}
In these situations I don’t do the self...
What's the shebang/hashbang (#!) in Facebook and new Twitter URLs for?
...he hash doesn't get sent to the server.
– Chris Broadfoot
Oct 17 '10 at 2:58
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