C++ Archives - Page 65 of 68

Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs

I was looking for the fastest way to popcount large arrays of data. I encountered a very weird effect: Changing the loop variable ...

April 12, 2022
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Cycles in family tree software

Locked. This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new ...

April 12, 2022
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Why does changing 0.1f to 0 slow down performance by 10x?

Why does this bit of code, const float x...

April 11, 2022
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What is the difference between const int, const int const, and int const *?

I always mess up how to use const int*, const int * const, and int const * correctly. Is there a set of ...

April 11, 2022
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What is an undefined reference/unresolved external symbol error and how do I fix it?

What are undefined reference/unresolved external symbol errors? What are common causes and how to fix/prevent them? 3 37

April 11, 2022
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What is a lambda expression in C++11?

What is a lambda expression in C++11? When would I use one? What class of problem do they solve that wasn’t possible prior ...

April 11, 2022
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Is < faster than

Is if (a < 901) faster than if (a <= 900)? Not exactly as in this simple example, but there are slight performance ...

April 11, 2022
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When to use virtual destructors?

I have a solid understanding of most OOP theory but the one thing that confuses me a lot is virtual destructors. I thought ...

April 11, 2022
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Why should I use a pointer rather than the object itself?

I’m coming from a Java background and have started working with objects in C++. But one thing that occurred to me is that ...

April 10, 2022
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Image Processing: Algorithm Improvement for ‘Coca-Cola Can’ Recognition

One of the most interesting projects I’ve worked on in the past couple of years was a project about image processing. The goal ...

April 10, 2022
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