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How do you create a transparent demo screen for an Android app?
...parent="@android:style/Theme.NoTitleBar">
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:...
rails - Devise - Handling - devise_error_messages
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I just tried this but that doesn't work. The goal is to get the error to output here: <% flash.each do |key, value| %>
– AnApprentice
May 26 '11 at 18:00
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Create an Array of Arraylists
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As per Oracle Documentation:
"You cannot create arrays of parameterized types"
Instead, you could do:
ArrayList<ArrayList<Individual>> group = new ArrayList<ArrayList<Individual>>(4);
As suggested by Tom Ha...
Why do we need extern “C”{ #include } in C++?
Why do we need to use:
11 Answers
11
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What is meant by 'first class object'?
... the aspect of JavaScript where functions are 'first class' objects. What does the 'first class' mean in this context, as opposed to other objects?
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How do you reverse a string in place in C or C++?
How do you reverse a string in C or C++ without requiring a separate buffer to hold the reversed string?
30 Answers
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Rename multiple files based on pattern in Unix
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This is how sed and mv can be used together to do rename:
for f in fgh*; do mv "$f" $(echo "$f" | sed 's/^fgh/jkl/g'); done
As per comment below, if the file names have spaces in them, quotes may need to surround the sub-function that returns the name to move the files...
Create a string with n characters
...e for loop will be optimized by the compiler. In such cases like yours you don't need to care about optimization on your own. Trust the compiler.
BTW, if there is a way to create a string with n space characters, than it's coded the same way like you just did.
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Is multiplication and division using shift operators in C actually faster?
...instruction as a sequence of shifts & adds in microcode.
Bottom line--don't spend a lot of time worrying about this. If you mean to shift, shift. If you mean to multiply, multiply. Do what is semantically clearest--your coworkers will thank you later. Or, more likely, curse you later if you...
What is the copy-and-swap idiom?
What is this idiom and when should it be used? Which problems does it solve? Does the idiom change when C++11 is used?
5 An...