Avoiding type confusion with the square (or nth root etc) of some quantity in modern C++ -


immediately after introduction, these recommendations how program in c++ start philosophical assertion 1 should "express ideas directly in code". sounded great idea until came this:

speed s;                 // there 1 single value std::vector<mass> m;     // there may millions/billions of values computetotalkineticenergy();

if there lots of masses, , normal "half-em-vee-squared" laws of physics apply, makes sense square speed outside (implicit, necessary) loop on vector of masses. type of speed s variable once squared? doesn't notion of expressing ideas "directly in code" lead problems moment want compute logarithm or nth root or similar? in case, 1 define (ugly) type of speedsquared, general principle applies equally functions applied speed std::chrono::high_resolution_clock::time_point?

if care having strong types quantities, use boost.units, or write own units library.

otherwise, convert speed , mass values real numbers when kinetic energy calculation, , convert resulting real number energy value, or something. it's not big deal you're not using "proper" type @ 1 tiny intermediate stage of calculation.


-

Comments

Post a Comment

Popular posts from this blog

amazon web services - S3 Pre-signed POST validate file type? -

i know it's possible put limit on file size content-length-range header. possible validate file type? https://docs.aws.amazon.com/amazons3/latest/dev/httppostforms.html#policyconditions i see there content-type header, if set say, audio/mp3 allow mp3 files , return error if file not mp3? i found previous question answers mention validating file size: s3 direct upload restricting file size , type you can specify content-type @ post request. you can specify @ signature, post must done content-type: { "expiration": "2007-12-01t12:00:00.000z", "conditions": [ {"acl": "public-read" }, {"bucket": "johnsmith" }, {"content-type: "audio/mp3"} ] } creating html form (using aws signature version 4) edit: @ previous question found, checking content-type.
Read more

c# - Check Keyboard Input Winforms -

i wondering if instead of doing this protected override void onkeydown(keyeventargs e) { if (e.keycode == keys.a) console.writeline("the key down."); } i set bool method , this: if(keydown(keys.a)) // whatever here i've been sitting here ages trying figure out how it. can't wrap head around it. in case wondering, plan call bool inside different method, check input. since want perform action after pressing key, using keydown event enough. but in cases suppose want check if specific key down in middle of process, can use getkeystate method way: [dllimport("user32.dll", charset = charset.auto, exactspelling = true)] public static extern short getkeystate(int keycode); public const int key_pressed = 0x8000; public static bool iskeydown(keys key) { return convert.toboolean(getkeystate((int)key) & key_pressed); } you should know, each time check key state using example iskeydown(keys.a) method returns true if ke...
Read more