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Swift variable decorations with “?” (question mark) and “!” (exclamation mark)
... important difference that if you don't check for nil you'll get a runtime error)
// Cannot be nil
var x: Int = 1
// The type here is not "Int", it's "Optional Int"
var y: Int? = 2
// The type here is "Implicitly Unwrapped Optional Int"
var z: Int! = 3
Usage:
// you can add x and z
x + z == 4
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How to compile for Windows on Linux with gcc/g++?
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cool, the cpp had very simple errors (void main(){} etc...), I guess it compiles at windows but fails at mingw, I fixed them. I tried also i586-mingw32msvc-cpp and it generated a text file with something like things to be compiled lol.. the g++ one worke...
How do I update pip itself from inside my virtual environment?
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Running this shown me a lot of stuff including Download error on https://pypi.python.org/simple/pip/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) -- Some packages may not be found! which wasn't displayed when running --upgrade. And it's likely the...
How to install python3 version of package via pip on Ubuntu?
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The curl call borks for me with a syntax error on line 48.
– icedwater
Jan 29 '16 at 5:17
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No increment operator (++) in Ruby? [duplicate]
... x++ then Ruby expects another operand. This is why you tend to get syntax errors if you try to use ++ at the moment as Ruby takes part of the next statement as the operand. += is implemented as call + on the receiver passing the RHS as a parameter and then assign the value returned by + to the vari...
How to configure logging to syslog in Python?
...er")
logger.debug("Debug")
logger.info("Info")
logger.warn("Warn")
logger.error("Error")
logger.critical("Critical")
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How do I create directory if none exists using File class in Ruby?
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@JosephK - for me this (misleading) EEXIST error ended up being a permission issue.
– TomG
Dec 17 '19 at 13:19
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Using openssl to get the certificate from a server
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Hmm. I still get the same error when trying that command. I noticed my Openssl version is 'OpenSSL 0.9.8g 19 Oct 2007'. Do you have any ideas?
– nasty pasty
Oct 26 '11 at 2:07
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proguard hell - can't find referenced class
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This error occurs because the libs you use depend on other libs which are not realy used, but Proguard is looking for them.
Add your -dontwarn lines to your proguard-rules.pro file in your Android project to disable this warnings...
Why the switch statement cannot be applied on strings?
Compiling the following code and got the error of type illegal .
20 Answers
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