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Virtual functions and performance - C++
...n L1) and ran a loop that added them to one another (A.x = B.x + C.x) 1000 times. I ran this with the functions defined as inline, virtual, and regular function calls. Here are the results:
inline: 8ms (0.65ns per call)
direct: 68ms (5.53ns per call)
virtual: 160ms (13ns per call)
So, in th...
How can I profile C++ code running on Linux?
..., there's a simple way to find performance problems.
Just halt it several times, and each time look at the call stack. If there is some code that is wasting some percentage of the time, 20% or 50% or whatever, that is the probability that you will catch it in the act on each sample. So, that is rou...
How do I remove repeated elements from ArrayList?
I have an ArrayList<String> , and I want to remove repeated strings from it. How can I do this?
38 Answers
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How to save a PNG image server-side, from a base64 data string
I'm using Nihilogic's "Canvas2Image" JavaScript tool to convert canvas drawings to PNG images.
What I need now is to turn those base64 strings that this tool generates, into actual PNG files on the server, using PHP.
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Benchmarking small code samples in C#, can this implementation be improved?
...
watch.Stop();
Console.Write(description);
Console.WriteLine(" Time Elapsed {0} ms", watch.Elapsed.TotalMilliseconds);
return watch.Elapsed.TotalMilliseconds;
}
Make sure you compile in Release with optimizations enabled, and run the tests outside of Visual Studio. This last part ...
Git status shows files as changed even though contents are the same
I received a git checkout from someone else and am trying to commit the unstaged changes to the local repository. However, a lot (if not every) file appears as modified even though the contents are exactly the same.
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Performance of static methods vs instance methods
...ially since the likelihood if that reference being in a register the whole time is quite high too).
The real performance differences will come down to whether you've artificially got objects in memory to do something that should naturally be static, or you're tangling up chains of object-passing in...
Web API Put Request generates an Http 405 Method Not Allowed error
Here's the call to the PUT method on my Web API - the third line in the method (I am calling the Web API from an ASP.NET MVC front end):
...
What is VanillaJS?
I have one simple question, that got stuck in my mind for a few days: What is VanillaJS? Some people refer to it as a framework, you can download a library from the official pages.
...
Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
Excel RTD(Excel Real-Time Data)实时刷新数据技术从Excel 2002开始，微软提供了一种叫做Excel RTD（real-time data）的技术，使用该技术可以在Excel中实时查看和更新数据。RTD采用所谓的...从Excel 2002开始，微软提供了一种叫做Excel RTD（real-time d...