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Is returning by rvalue reference more efficient?

...r can, it will avoid the move altogether, by using RVO (return value optimization). Now, you can do the following Beta_ab ab = others.toAB(); And it will move construct the temporary into ab, or do RVO to omit doing a move or copy altogether. I recommend you to read BoostCon09 Rvalue References 1...
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Does it make sense to do “try-finally” without “catch”?

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SQLite table constraint - unique on multiple columns

...j 22.1k1717 gold badges8585 silver badges116116 bronze badges answered Apr 23 '10 at 20:50 Ayman HouriehAyman Hourieh 107k1717 gol...
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How to programmatically set the layout_align_parent_right attribute of a Button in Relative Layout?

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Rails auto-assigning id that already exists

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Concurrent.futures vs Multiprocessing in Python 3

... you use multiple threads or multiple processes as the underlying parallelization gimmick. So, like virtually all instances of "simpler interface", much the same trade-offs are involved: it has a shallower learning curve, in large part just because there's so much less available to be learned; but,...
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Copy multiple files in Python

...dsson 11.8k66 gold badges4444 silver badges6262 bronze badges answered Aug 3 '10 at 17:59 GreenMattGreenMatt 16.1k66 gold badges45...
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How do I make this file.sh executable via double click?

...our default shell. (Of course, you can add a #! line if you want to customize which shell is used or if you want to ensure that you can execute it from the command line while using a different shell.) Also note that Terminal executes the shell script without changing the working directory. You’ll...
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Order data frame rows according to vector with specific order

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image.onload event and browser cache

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