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When is memoization automatic in GHC Haskell?

...new version is much less efficient because it will have to read about 1 GB from memory where y is stored, while the original version would run in constant space and fit in the processor's cache. In fact, under GHC 6.12.1, the function f is almost twice as fast when compiled without optimizations th...
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Checking in of “commented out” code [closed]

...ould a ban on checking in commented-out code have prevented that developer from making this oversight? The ban just gives you TWO things to punish over instead of one. It doesn't prevent the oversight. – Eddie Apr 16 '09 at 23:43 ...
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What do hjust and vjust do when making a plot using ggplot?

...the case of angle=45, when I have axis labels of varying length, let's say from 25 to 5 characters, they're neither aligned justified to the right or the left of the word boundaries. Take a look at the axes here If I were to use angle=45, how would I make them right-justified and flush against the a...
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Does C++ support 'finally' blocks? (And what's this 'RAII' I keep hearing about?)

...quired because of RAII. RAII moves the responsibility of exception safety from the user of the object to the designer (and implementer) of the object. I would argue this is the correct place as you then only need to get exception safety correct once (in the design/implementation). By using finally ...
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How do I discover memory usage of my application in Android?

...of little use, since the Java heap limit is there in part to avoid one app from being able to stress the system to this point. Going lower-level, you can use the Debug API to get raw kernel-level information about memory usage: android.os.Debug.MemoryInfo Note starting with 2.0 there is also an AP...
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React.js: Wrapping one component into another

...it easy to pass the props down do children component (in this case Hello). From React 0.14.* onwards the only way to pass props to children components would be to use React.createClone, which might be expensive. – Mukesh Soni Sep 10 '15 at 18:47 ...
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How to use PrimeFaces p:fileUpload? Listener method is never invoked or UploadedFile is null / throw

...loadedFile#getInputStream() instead. See also How to insert uploaded image from p:fileUpload as BLOB in MySQL? Another potential problem with native API will manifest is when the upload component is present in a form on which a different "regular" ajax request is fired which does not process the up...
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How to avoid isset() and empty()

...e key exists or not, because you know it does. If you're getting the array from an external source, the value will most likely not be null but '', 0, '0', false or something like it, i.e. a value you can evaluate with isset or empty, depending on your intent. If you regularly set an array key to nul...
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What is the difference between LL and LR parsing?

...eft-to-right, leftmost derivation. That is, we consider the input symbols from the left to the right and attempt to construct a leftmost derivation. This is done by beginning at the start symbol and repeatedly expanding out the leftmost nonterminal until we arrive at the target string. An LR pars...
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How to build an android library with Android Studio and gradle?

I am trying to migrate a project from Eclipse but nothing I have tried is working. In Eclipse I have 3 projects (2 android app projects and 1 android library project). The 2 app projects depend on the library project. When I do the gradle export I get 3 projects that don't work. I am open to restruc...