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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...Java arrays (which are erroneously covariant):
Object[] arr = new Integer[1];
arr[0] = "Hello, there!";
We just assigned a value of type String to an array of type Integer[]. For reasons which should be obvious, this is bad news. Java's type system actually allows this at compile time. The JVM...
How to implement has_many :through relationships with Mongoid and mongodb?
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151
Mongoid doesn't have has_many :through or an equivalent feature. It would not be so useful wit...
Groovy / grails how to determine a data type?
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edited Apr 22 '10 at 8:24
answered Jan 13 '10 at 21:34
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sed in-place flag that works both on Mac (BSD) and Linux
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13 Answers
13
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Include jQuery in the JavaScript Console
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1405
Run this in your browser's JavaScript console, then jQuery should be available...
var jq = d...
Disabling the fullscreen editing view for soft keyboard input in landscape?
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11 Answers
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Getting a random value from a JavaScript array
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1575
It is a simple one-liner
const randomElement = array[Math.floor(Math.random() * array.length)...
'typeid' versus 'typeof' in C++
...ou are talking about GCC's typeof, then a similar feature is present in C++11 through the keyword decltype. Again, C++ has no such typeof keyword.
typeid is a C++ language operator which returns type identification information at run time. It basically returns a type_info object, which is equality-...
How to use GNU Make on Windows?
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101
Here's how I got it to work:
copy c:\MinGW\bin\mingw32-make.exe c:\MinGW\bin\make.exe
The...