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undefined reference to boost::system::system_category() when compiling
...
The boost library you are using depends on the boost_system library. (Not all of them do.)
Assuming you use gcc, try adding -lboost_system to your compiler command line in order to link against that library.
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What's the dSYM and how to use it? (iOS SDK)
... 0x000000018f3c9380 closure #1 in closure #1 in closure #1 in _assertionFailure+ 217984 (_:_:file:line:flags:) + 452
1 libswiftCore.dylib 0x000000018f3c9380 closure #1 in closure #1 in closure #1 in _assertionFailure+ 217984 (_:_:file:line:flags:) + 452
2 libswiftCore.d...
Python string class like StringBuilder in C#?
...st of length-one strings. (To make this from a string, you'd call list(your_string). You could also use a UserString.MutableString for this.
(c)StringIO.StringIO is useful for things that would otherwise take a file, but less so for general string building.
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Programmatically Request Access to Contacts
... // First time access has been granted, add the contact
[self _addContactToAddressBook];
} else {
// User denied access
// Display an alert telling user the contact could not be added
}
});
}
else if (ABAddressBookGetAuthorizationStatus() == kABAu...
How can I use pickle to save a dict?
...ickle', 'wb') as handle:
pickle.dump(a, handle, protocol=pickle.HIGHEST_PROTOCOL)
with open('filename.pickle', 'rb') as handle:
b = pickle.load(handle)
print a == b
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When to use in vs ref vs out
...f myfuncOut and myfuncRef are identical as expected.
outRefTest.myfunc:
IL_0000: nop
IL_0001: ldc.i4.0
IL_0002: starg.s 00
IL_0004: ldarg.0
IL_0005: stloc.0
IL_0006: br.s IL_0008
IL_0008: ldloc.0
IL_0009: ret
outRefTest.myfuncOut:
IL_0000: ...
Is there a way to make mv create the directory to be moved to if it doesn't exist?
... this one-liner (in bash):
mkdir --parents ./some/path/; mv yourfile.txt $_
Breaking that down:
mkdir --parents ./some/path
creates the directory (including all intermediate directories), after which:
mv yourfile.txt $_
moves the file to that directory ($_ expands to the last argument passe...
Is it possible to forward-declare a function in Python?
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in short, if you have if __name__ == '__main__': main() as the last line in your script everything will be just fine!
– Filipe Pina
Aug 3 '11 at 12:24
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Is there a REAL performance difference between INT and VARCHAR primary keys?
...(think US States, Country Codes) and a coworker won't budge on the INT AUTO_INCREMENT as a primary key for all tables.
14 ...
How can I uninstall an application using PowerShell?
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$app = Get-WmiObject -Class Win32_Product | Where-Object {
$_.Name -match "Software Name"
}
$app.Uninstall()
Edit: Rob found another way to do it with the Filter parameter:
$app = Get-WmiObject -Class Win32_Product `
-Filter "N...