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Print rng seed upon failure so test can be reproduced

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This commit is contained in:
Andrei Alexandrescu 2016-09-24 12:11:02 -04:00
parent f19c92a1bf
commit 3156509175
1 changed files with 9 additions and 3 deletions
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12
std/algorithm/sorting.d
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@ -621,7 +621,7 @@ if (isRandomAccessRange!Range && hasLength!Range && hasSlicing!Range)
// Pivot at the front
r.swapAt(pivot, 0);
// Fork implemnentation depending on nothrow copy, assignment, and
// Fork implementation depending on nothrow copy, assignment, and
// comparison. If all of these are nothrow, use the specialized
// implementation discussed at https://youtube.com/watch?v=AxnotgLql0k.
static if (is(typeof(
@ -742,9 +742,15 @@ if (isRandomAccessRange!Range && hasLength!Range && hasSlicing!Range)
assert(pivot == 0 || pivot == 1);
assert(a == [ 42, 42 ]);
import std.random : uniform;
import std.random;
import std.algorithm.iteration : map;
a = iota(0, uniform(1, 1000)).map!(_ => uniform(-1000, 1000)).array;
import std.stdio;
auto s = unpredictableSeed;
auto g = Random(s);
a = iota(0, uniform(1, 1000, g))
.map!(_ => uniform(-1000, 1000, g))
.array;
scope(failure) writeln("RNG seed was ", s);
pivot = pivotPartition!less(a, a.length / 2);
assert(a[0 .. pivot].all!(x => x <= a[pivot]));
assert(a[pivot .. $].all!(x => x >= a[pivot]));