Andrei Alexandrescu, el 13 de febrero a las 17:10 me escribiste: > Leonardo suggested that some functions in std.random should not require their > user to be bothered with creating a random object, i.e.: > > auto r = Random(unpredictableSeed); > auto n = uniform(r, 0, 100); > > Instead the library should simply support: > > auto n = uniform(0, 100); > > and do this by presumably using a global RNG under the hood. So I wanted to > ask > all y'all: > > 1. Are you cool with making the rng the last parameter and give it a default > value?
Yes > 2. The global random generator will be allocated per thread. Are you cool > with > this too? Yes > 3. How should the global rng be initialized? To always generate the same > sequence, or not? NO! I think this feature is for small script-like programs, where the most common case is you want a random number to be random =) If you want to do some more complicated stuff, just set the seed yourself. > 4. While we're at it, should uniform(a, b) generate by default something in > [a, > b] or [a, b)? Someone once explained to me that generating [a, b] for > floating > point numbers is the source of all evils and that Hitler, Stalin and Kim Il > Sung > (should he still be alive) must be using that kind of generator. Conversely, > generating [a, b) is guaranteed to bring in the long term everlasting peace > to > Earth. My problem however is that in the integer realm I always want to > generate > [a, b]. Furthermore, I wouldn't be happy if the shape of the interval was > different for integers and floating point numbers. How to break this > conundrum? > Don't forget that we're only worrying about defaults, explicit generation is > always possible with self-explanatory code: Being a C and Python programmer mostly, I find more intuitive [a, b) (The 'for' statement is usually used that way, same for the Python's range() function) -- Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/ ---------------------------------------------------------------------------- GPG Key: 5F5A8D05 (F8CD F9A7 BF00 5431 4145 104C 949E BFB6 5F5A 8D05) ---------------------------------------------------------------------------- Un paracaidista, que no deja de caer. Lo que me lleva hacia arriba, es lo que me tira hacia abajo.
