Here we have a method that allows us to determine return parameter type using templates and operator overloading in C++. This is something that I needed for a project that I am working on where a method call would give me the expected type based on the return type. Usage There is two way of …
Example with Chromium Embedded Framework (CEF) on how to create an object in C++ and make it accessible via Javascript. console.inof(api) Object {ready: true, version: "psql.0.0.1", info: Object, getVersion: function}console.inof(api) Object {ready: true, version: "psql.0.0.1", info: Object, getVersion: function} void ExtractEngineApp::OnContextCreated( CefRefPtr<CefBrowser> browser, CefRefPtr<CefFrame> frame, CefRefPtr<CefV8Context> context) { auto info = CefV8Value::CreateObject(NULL, NULL); info->SetValue("major", …
Creating Javascript accessible object from C++ / CEF Read More »
struct Point { Point(int_t _x, int_t _y) : x(_x), y (_y) { } int_t x; int_t y; }; typedef std::list<Point*> points_t; double euclideanDistance(const Point& lhs,const Point& rhs) { double p1 = std::pow((float)(rhs.x – lhs.x), 2); double p2 = std::pow((float)(rhs.y – lhs.y), 2); double vd = std::sqrt(p1 + p2); …
Leptonica provides us with easy way to read barcodes but it does not offer a way to create them(as far as I know). Here is a leptonica function that will allow us to generate CODABAR barcode, in the feature I am planning on adding more type and more options but for now this was all …
Using popcnt instruction found on newer processors to get population count which is number of set bits. Reference : SSE4 Here are couple example inputs with expected output. 0xA = 1010 — > 2 0x3F2 = 1111110010 — > 7 #include <iostream> #include <stdio.h> using namespace std; int main() { // 0xA = …
Population Count using popcnt instruction (counting number of on bits) Read More »
Common use is to crop to certain area of an image, this can be quite easily accomplished with following code. BOX* box = boxCreate(x, y, w, h); PIX* dpix= pixClipRectangle(spix, box, NULL);BOX* box = boxCreate(x, y, w, h); PIX* dpix= pixClipRectangle(spix, box, NULL);
This is program demonstrates how to use ‘cpuid’ assembly instruction on x86 to retrieve cache line size. This is done in c++ and it uses the inline assembly to execute the instructions, compiled with gcc on win32. Really we are only interested in Cache line information which can be found using 0x80000006 code and its …
Using ‘cpuid’ instructions to get cache line size Read More »
Leptonica Development with Eclipse This is the first one of few tutorials that I am writring on using Leptonica image processing library Before we start let’s give credit where the credit is due, and this is goes out to Jay W.(need link) on which this instructions are largely based on. Environment Eclipse MinGW Leptonica I …
About QuickSort Wikipedia QuickSort definition. General idea revolves around partitioning a list where values less than pivot go into left list while greater than go into right list. Pivot here is the first item of the passed in list. We apply this recursively to the sublists them merge left+pivot+right. CPP Code First of all not …
