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What does an exclamation mark mean in the Swift language?
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"forced unwrapping": john! (gives the Person value if it exists, runtime error if it is nil)
"optional binding": if let p = john { println(p) } (executes the println if the value exists)
"optional chaining": john?.learnAboutSwift() (executes this made-up method if the value exists)
I guess you c...
What are the differences between Autotools, Cmake and Scons?
...o run autoconf to regenerate the configure script, and this is a packaging error. More confusion has been caused by the fact that most major linux distributions install multiple versions of the autotools, when they should not be installing any of them by default. Even more confusion is caused by d...
How to get highcharts dates in the x axis?
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What is the difference between a “function” and a “procedure”?
...o those in Pascal. A procedure can contain return statements.". Is this an error in the text? Or does it mean that it can have return statements but don't return any values?
– jviotti
Jan 14 '15 at 23:24
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Comments in command-line Zsh
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edited Jan 8 at 16:05
answered Jan 8 at 15:54
FlakRa...
How to know if an object has an attribute in Python
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hasattr is exactly the same as using try/except AttributeError: the docstring of hasattr (in Python 2.7) says that it uses getattr hand catches exceptions.
– Jeff Tratner
Apr 27 '12 at 3:04
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How do you send a HEAD HTTP request in Python 2?
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edited Oct 22 '12 at 2:05
answered Oct 21 '12 at 11:00
K...
The “backspace” escape character '\b': unexpected behavior?
So I'm finally reading through K&R , and I learned something within the first few pages, that there is a backspace escape character, \b .
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C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
C++特化模板函数的符号多重定义错误问题error LNK2005: "void __stdcall SerializeElements<class CLogEvent> ...fatal error LNK1169: 找到一个或多个多重定义的符号.我...特化模板函数SerializeElements时，报重复定义的错误，如下：
error LNK2005: "void __std...
TypeLoadException says 'no implementation', but it is implemented
I've got a very weird bug on our test machine. The error is:
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