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random: add fixed-size std::array generation

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Co-authored-by: Hodlinator <172445034+hodlinator@users.noreply.github.com>
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Lőrinc
2025-07-15 14:54:52 -07:00
parent 184159e4f3
commit 7aa557a37b
2 changed files with 10 additions and 1 deletions
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9
src/random.h
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@@ -301,6 +301,15 @@ public:
return ret; return ret;
} }
/** Generate fixed-size random bytes. */
template <size_t N, BasicByte B = std::byte>
std::array<B, N> randbytes() noexcept
{
std::array<B, N> ret;
Impl().fillrand(MakeWritableByteSpan(ret));
return ret;
}
/** Generate a random 32-bit integer. */ /** Generate a random 32-bit integer. */
uint32_t rand32() noexcept { return Impl().template randbits<32>(); } uint32_t rand32() noexcept { return Impl().template randbits<32>(); }

2
src/test/random_tests.cpp
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@@ -58,7 +58,7 @@ BOOST_AUTO_TEST_CASE(fastrandom_tests_deterministic)
BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32()); BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
BOOST_CHECK_EQUAL(ctx1.rand64(), ctx2.rand64()); BOOST_CHECK_EQUAL(ctx1.rand64(), ctx2.rand64());
BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3)); BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3));
BOOST_CHECK(ctx1.randbytes(17) == ctx2.randbytes(17)); BOOST_CHECK(std::ranges::equal(ctx1.randbytes<std::byte>(17), ctx2.randbytes<17>())); // check vector/array behavior symmetry
BOOST_CHECK(ctx1.rand256() == ctx2.rand256()); BOOST_CHECK(ctx1.rand256() == ctx2.rand256());
BOOST_CHECK_EQUAL(ctx1.randbits(7), ctx2.randbits(7)); BOOST_CHECK_EQUAL(ctx1.randbits(7), ctx2.randbits(7));
BOOST_CHECK(ctx1.randbytes(128) == ctx2.randbytes(128)); BOOST_CHECK(ctx1.randbytes(128) == ctx2.randbytes(128));