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Allow to pass a 'seed' to RKISS

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This somewhat simplifies the code.

Suggested by Lucas Braesch.

No functional change.
This commit is contained in:
Marco Costalba 2012-12-31 11:57:49 +01:00
parent 009a0f88e0
commit 896420b166
2 changed files with 4 additions and 10 deletions
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6
src/book.cpp
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@ -348,11 +348,7 @@ namespace {
} // namespace } // namespace
PolyglotBook::PolyglotBook() { PolyglotBook::PolyglotBook() : RKiss(Time::now() % 10000) {}
for (int i = Time::now() % 10000; i > 0; i--)
RKiss.rand<unsigned>(); // Make random number generation less deterministic
}
PolyglotBook::~PolyglotBook() { if (is_open()) close(); } PolyglotBook::~PolyglotBook() { if (is_open()) close(); }

8
src/rkiss.h
View file

@ -61,17 +61,15 @@ class RKISS {
return s.d = e + s.a; return s.d = e + s.a;
} }
// Init seed and scramble a few rounds public:
void raninit() { RKISS(int seed = 73) {
s.a = 0xf1ea5eed; s.a = 0xf1ea5eed;
s.b = s.c = s.d = 0xd4e12c77; s.b = s.c = s.d = 0xd4e12c77;
for (int i = 0; i < 73; i++) for (int i = 0; i < seed; i++) // Scramble a few rounds
rand64(); rand64();
} }
public:
RKISS() { raninit(); }
template<typename T> T rand() { return T(rand64()); } template<typename T> T rand() { return T(rand64()); }
}; };