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Add a FastRandomContext::randrange and use it

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This commit is contained in:
Pieter Wuille 2017-02-25 12:16:58 -08:00
parent 16329224e7
commit 4fd2d2fc97
7 changed files with 75 additions and 2 deletions
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15
src/test/random_tests.cpp
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@ -35,4 +35,19 @@ BOOST_AUTO_TEST_CASE(fastrandom_tests)
BOOST_CHECK(ctx3.rand64() != ctx4.rand64()); // extremely unlikely to be equal
}
BOOST_AUTO_TEST_CASE(fastrandom_randbits)
{
FastRandomContext ctx1;
FastRandomContext ctx2;
for (int bits = 0; bits < 63; ++bits) {
for (int j = 0; j < 1000; ++j) {
uint64_t rangebits = ctx1.randbits(bits);
BOOST_CHECK_EQUAL(rangebits >> bits, 0);
uint64_t range = ((uint64_t)1) << bits | rangebits;
uint64_t rand = ctx2.randrange(range);
BOOST_CHECK(rand < range);
}
}
}
BOOST_AUTO_TEST_SUITE_END()