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Assorted nitpicking code-style

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No functional change.
This commit is contained in:
Marco Costalba
2014-12-08 08:23:09 +01:00
parent 589c711449
commit 5943600a89
5 changed files with 21 additions and 13 deletions
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15
src/misc.h
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@@ -20,6 +20,7 @@
#ifndef MISC_H_INCLUDED
#define MISC_H_INCLUDED
#include <cassert>
#include <ostream>
#include <string>
#include <vector>
@@ -64,32 +65,36 @@ std::ostream& operator<<(std::ostream&, SyncCout);
/// This class is based on original code written and dedicated
/// to the public domain by Sebastiano Vigna (2014).
/// It has the following characteristics:
///
/// - Outputs 64-bit numbers
/// - Passes Dieharder and SmallCrush test batteries
/// - Does not require warm-up, no zeroland to escape
/// - Internal state is a single 64-bit integer
/// - Period is 2^64 - 1
/// - Speed: 1.60 ns/call (Core i7 @3.40GHz)
///
/// For further analysis see
/// <http://vigna.di.unimi.it/ftp/papers/xorshift.pdf>
class PRNG {
uint64_t x;
uint64_t s;
uint64_t rand64() {
x^=x>>12; x^=x<<25; x^=x>>27;
return x * 2685821657736338717LL;
s ^= s >> 12, s ^= s << 25, s ^= s >> 27;
return s * 2685821657736338717LL;
}
public:
PRNG(uint64_t seed) : x(seed) { assert(seed); }
PRNG(uint64_t seed) : s(seed) { assert(seed); }
template<typename T> T rand() { return T(rand64()); }
/// Special generator used to fast init magic numbers.
/// Output values only have 1/8th of their bits set on average.
template<typename T> T sparse_rand() { return T(rand64() & rand64() & rand64()); }
template<typename T> T sparse_rand()
{ return T(rand64() & rand64() & rand64()); }
};
#endif // #ifndef MISC_H_INCLUDED