It’s still true. Even more than OO software, the database suffers if it isn’t treated precisely the way intended. And it wasn’t intended that you should interpose some abstraction layer in front of it. I think of impermeable abstraction layers as trying to build a Lego castle with all the pieces closed up into a … Read more
The answer is no. To see why, let’s first articulate the question like so: Q: For a connected, undirected, weighted graph G = (V, E, w) with only nonnegative edge weights, does the predecessor subgraph produced by Dijkstra’s Algorithm form a minimum spanning tree of G? (Note that undirected graphs are a special class of … Read more
Optimizations. For the longest time, it was necessary to do this by hand. Now most compilers can do it infinitely better than any human ever could. Note: This is not to say that hand-optimizations aren’t still done, as pointed out in the comments. I’m merely saying that a number of optimizations that used to be … Read more
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I really enjoyed this article regarding DI, as it’s targeted towards people who don’t have a ton of DI experience, or don’t even know what it is. https://mtaulty.com/2009/08/10/m_11554/ What’s Unity? It’s a “dependency injection container”. Now, at that point a bunch of folks reading this will say “Yes, we know and we’re already using it … Read more
You can expand option 1 to have a 3rd column, giving a data-type. Your application can than use this data-type column to cast the value. But yeah, I would go with option 1, if config files are not an option. Another advantage of option 1 is you can read it into a Dictionary object (or … Read more
There has maybe been a lot of hype in the early 2000’s, and what happened is the following: there has been a lot of attempts to create aspect-oriented frameworks, and these attempts have merged into two significant projects in the Java sphere: AspectJ and Spring AOP. AspectJ is complete, complex, academic, somewhat overengineered. Spring AOP … Read more
There are formal and actual parameters: void foo(int arg); //arg is a formal parameter int main() { int val = 1; foo(val); //val is an actual parameter } From C++ Standard: 1.3.1 formal parameter (parameter) an object or reference declared as part of a function declaration or definition, or in the catch clause of an … Read more
Mathematically speaking, the zero vector cannot be normalized. Its length will always remain 0. For given vector v = (v1, v2, …, vn) we have: ||v|| = sqrt(v1^2 + v2^2 + … + vn^2). Let us remember that a normalized vector is one that has ||v||=1. So for v = 0 we have: ||0|| = … Read more