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Code Issues Activity

Do not permit copying FastRandomContexts

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This commit is contained in:
Pieter Wuille 2018-10-31 15:41:13 -07:00
parent 022cf47dd7
commit e414486d56
2 changed files with 22 additions and 0 deletions
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14
src/random.cpp
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@ -464,6 +464,20 @@ FastRandomContext::FastRandomContext(bool fDeterministic) : requires_seed(!fDete
rng.SetKey(seed.begin(), 32);
}
FastRandomContext& FastRandomContext::operator=(FastRandomContext&& from) noexcept
{
requires_seed = from.requires_seed;
rng = from.rng;
std::copy(std::begin(from.bytebuf), std::end(from.bytebuf), std::begin(bytebuf));
bytebuf_size = from.bytebuf_size;
bitbuf = from.bitbuf;
bitbuf_size = from.bitbuf_size;
from.requires_seed = true;
from.bytebuf_size = 0;
from.bitbuf_size = 0;
return *this;
}
void RandomInit()
{
RDRandInit();

8
src/random.h
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@ -76,6 +76,14 @@ public:
/** Initialize with explicit seed (only for testing) */
explicit FastRandomContext(const uint256& seed);
// Do not permit copying a FastRandomContext (move it, or create a new one to get reseeded).
FastRandomContext(const FastRandomContext&) = delete;
FastRandomContext(FastRandomContext&&) = delete;
FastRandomContext& operator=(const FastRandomContext&) = delete;
/** Move a FastRandomContext. If the original one is used again, it will be reseeded. */
FastRandomContext& operator=(FastRandomContext&& from) noexcept;
/** Generate a random 64-bit integer. */
uint64_t rand64()
{