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Efficient way to return a std::vector in c++
How much data is copied, when returning a std::vector in a function and how big an optimization will it be to place the std::vector in free-store (on the heap) and return a pointer instead i.e. is:
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How to automatically select all text on focus in WPF TextBox?
If I call SelectAll from a GotFocus event handler, it doesn't work with the mouse - the selection disappears as soon as mouse is released.
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How to load/edit/run/save text files (.py) into an IPython notebook cell?
... individual cells of an open IPython notebook so that they can edited, run and then saved. Can this be done?
4 Answers
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Visual Studio debugging/loading very slow
...") my ASP.NET MVC sites. Not always: at first, the projects will load nice and fast, but once they load slow, they'll always load slow after that. I could be waiting 1-2 minutes or more.
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How do I check in JavaScript if a value exists at a certain array index?
... element with index i is defined to be part of the array if i is between 0 and array.length - 1 inclusive. If i is not in this range it's not in the array.
So by concept, arrays are linear, starting with zero and going to a maximum, without any mechanism for having "gaps" inside that range where n...
NHibernate ISession Flush: Where and when to use it, and why?
...nfused is the use of session.Flush ,in conjunction with session.Commit , and session.Close .
4 Answers
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
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The explanation comes from Agner Fog in Optimizing software in C++ and it reduces to how data is accessed and stored in the cache.
For terms and detailed info, see the wiki entry on caching, I'm gonna narrow it down here.
A cache is organized in sets and lines. At a time, only one set is u...
Java 8: performance of Streams vs Collections
... the middle of the list using iterator.
Stop writing benchmarking code by hand, use JMH.
Proper benchmarks:
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@BenchmarkMode(Mode.AverageTime)
@OperationsPerInvocation(StreamVsVanilla.N)
public class StreamVsVanilla {
public static final int N = 10000;
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Removing transforms in SVG files
I have been struggling with this for a while, and can't seem to find an answer (that works) anywhere. I have an SVG file which looks like this:
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What is the ideal data type to use when storing latitude / longitude in a MySQL database?
... MYSQL Spatial is a good option, but still has significant limits and caveats (as of 6). Please see my answer below...
– James Schek
Oct 2 '08 at 15:43
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