... The 6g and 8g compilers are not particularly optimising, so the code they produce isn't particularly fast. They're designed to run fast themselves and produce code that's OK (there is a bit of optimisation). gccgo uses GCC's existi...

I am looking for a clear definition of what a "tokenizer", "parser" and "lexer" are and how they are related to each other (e.g., does a parser use a tokenizer or vice versa)? I need to create a program will go through c/h source files to extract data declaration and definitions. ...

... think about it like a book. If there were only 3 kinds of words in a book and you index all of them, you would have the same number of index pages as normal pages. There would be a performance gain if there are relatively few records of one value. For example, if you have 1000 records and 10 of t...

...crement operation atomic; it involves synchronization at both the software and hardware levels that need not be present in an ordinary increment. You could make the argument that i++ should have been designed and documented as specifically performing an atomic increment, so that a non-atomic increm...

... Wikipedia article on unsharp masking: You use a Gaussian smoothing filter and subtract the smoothed version from the original image (in a weighted way so the values of a constant area remain constant). To get a sharpened version of frame into image: (both cv::Mat) cv::GaussianBlur(frame, image, cv:...

...ive the function a name, even when you're creating the function as a value and not a "function declaration" statement. In other words: (function foo() { foo(); })(); is a stack-blowing recursive function. Now, that said, you probably don't may not want to do this in general because there are som...

I am going through documentation of data.table and also noticed from some of the conversations over here on SO that rbindlist is supposed to be better than rbind . ...

..." is subject to a lot of interpretation. :-) You can get the year, month, and day of month from a JavaScript date object. Depending on what information you're looking for, you can use those to figure out how many months are between two points in time. For instance, off-the-cuff: function monthDif...

I was just wondering how I could automatically increment the build (and version?) of my files using Visual Studio (2005). ...

...pby(k)) [[1, 2], [3], [4], [5, 6, 2]] itertools often offers the fastest and most powerful solutions to this kind of problems, and is well worth getting intimately familiar with!-) Edit: as I mention in a comment, normal optimization efforts are focused on large inputs (the big-O approach) becaus...