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Code Issues Releases Wiki Activity

better distribution in hrand and hrandf

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Zeno Rogue
2018-09-23 03:05:45 +02:00
parent ad3355f500
commit 98e96a20c3
1 changed files with 10 additions and 2 deletions
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12
game.cpp
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@@ -155,12 +155,20 @@ void shrand(int i) {
int hrandpos() { return hrngen() & HRANDMAX; } int hrandpos() { return hrngen() & HRANDMAX; }
// using our own implementations rather than ones from <random>,
// to make sure that they return the same values on different compilers
int hrand(int i) { int hrand(int i) {
return hrngen() % i; unsigned d = hrngen() - hrngen.min();
long long m = (long long) (hrngen.max() - hrngen.min()) + 1;
m /= i;
d /= m;
if(d < (unsigned) i) return d;
return hrand(i);
} }
ld hrandf() { ld hrandf() {
return (hrngen() & HRANDMAX) / (HRANDMAX + 1.0); return (hrngen() - hrngen.min()) / (hrngen.max() + 1.0 - hrngen.min());
} }
int hrandstate() { int hrandstate() {