[pt_view id="3a985d76d6"]
Continue ReadingC++: Why is one loop so much slower than two loops?
Suppose a1, b1, c1, and d1 point to heap memory and my numerical code has the following core loop. const int n=100000 for(int j=0;j<n;j++){
Continue ReadingC++: What does the explicit keyword in C++ mean?
Someone posted in a comment to another question about the meaning of the explicit keyword in C++. So, what does it mean? Skizz Answer: In C++, th
Continue ReadingC++: Why does changing 0.1f to 0 slow down performance by 10x?
Why does this bit of code, const float x[16] = { 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1,
Continue ReadingC++: Cycles in family tree software
I am the developer of some family tree software (written in C++ and Qt). I had no problems until one of my customers mailed me a bug report. The probl
Continue ReadingWhy is processing a sorted array faster than an unsorted array?
Here is a piece of C++ code that seems very peculiar. For some strange reason, sorting the data miraculously makes the code almost six times faster.
Continue ReadingC++: Heap Sort
#include <algorithm> // for std::make_heap, std::sort_heap template <typename Iterator> void heap_sort(Iterator begin, Iterator en
Continue ReadingC++: Insertion Sort
#include <algorithm> template<class Iterator> void insertion_sort( Iterator a, Iterator end ) { std::iter_swap( a, std::min_ele
Continue ReadingJava += operator
Until today I thought that for example: i += j; is just a shortcut for: i = i + j; But what if we try this: int i = 5; long j = 8; Then i = i +
Continue ReadingBest C++ Books
Reference Style - All Levels A Tour of C++ (Bjarne Stroustrup) The "tour" is a quick (about 180 pages and 14 chapters) tutorial overview of all
Continue Reading
