Coding Tidbit

The benchmark code is hosted at GitHub. In this tip, we’ll benchmark native operator with singular min()/max() and iterator versions like min_element()/max_element(). Lastly, we benchmark the combined operations with minmax_element(). This is the benchmark code. const size_t MAX_LOOP = (argc == 2) ? atoi(argv[1]) : 1000; using int_type = uint64_t; std::vector vec(1000000); std::iota(vec.begin(), vec.end(), 1); […]

Let's write a simple program to test. To get a NaN, we do a 0/0 and store it in num. First of all, the divisor has to be a float-point type because DivideByZeroException shall be thrown for integer or decimal zero divisor. Note: Non-zero number divided by zero (float) gives an infinity number. In our […]

Advice for suitable type of technical question to ask in an interview   Write code to sum up from 1 to 100 One has to especially careful when the question is deceptively simple, for instance, sum up all the numbers from 1 to 100. A simple summing loop wouldn’t suffice to satisfy your interviewer. He […]

Optimization of finding a point with shortest distance w.r.t. a point of interest The benchmark source code is hosted at Github. Table of Contents Introduction Shortest Distance Benchmark Results History Introduction When it comes to optimization, majority of developers turn to parallelism but per CPU core isn’t cheap. We could look to eliminate some operations […]

Download the benchmark code on GitHub. C++14 introduced ordered transparency lookup which enables const char* and string_view lookup without string instantiation on map/set objects. C++20 introduced unordered transparency lookup that allows to do same thing with unordered_map/unordered_set. We are officially in 2020 but as of writing time, the C++20 Standard is yet to be ratified […]

Floating-Point Dissector is available for download at GitHub. Table of Contents Introduction Floating-Point Dissector Common Misconceptions Floating-Point Conversion to Integer 32-Bit Floating-Point Format Zero Subnormal (Underflow) Subnormal are much slower on Intel processor Infinity (Overflow) Not a Number Summary Chart Floating-Point Exception Equality Test Other Types References Introduction The IEEE 754 standard for floating-point format […]

Table of Contents Introduction Lee Algorithm for Mazesolving Important Notes Direct2D Code References History Introduction In 1999, my team won Obstacle Avoidance Robot(OAR) first prize in the Singapore Robotics Games(SRG). That was 20 years ago. I do not have a photo of OAR, but it looks very much like micromouse. The micromouse maze is constructed […]

Table of Contents Introduction ref-return on Value Member Benchmark Conclusion Reference History Introduction C# 7 introduced ref-local and ref-return functionality to allow safe direct-memory access to value variables. Before C# 7, we could do it in an unsafe code but now is available to access in a safe way. This is an example of ref-local […]

Table of Contents Introduction Render Function Setting up OpenGL with SDL2 Setting up OpenGL with Emscripten OpenGL Shader Precision Inline your Shader Code Load Asset Introduction Prior to reading this article, that is if you have not setup your Emscripten, you have to read this article: Bring Your C++ Code to the Web. Let me […]

Introduction For file storage and data communication to work interoperably, the width of datatype must stay invariant across platforms. This tip discusses the pitfalls of platform-dependent data width and their solution. Endianess, deserving a tip of its own, is not covered here. time_t time_t stores the number of seconds since 1st January 1970. It is […]