Random Class Reference

Public Member Functions
uint64_t	Value ()
void	Init (uint64_t seed)
uint64_t	Value ()
void	Init (uint64_t seed)

Static Private Member Functions
static uint64_t	Rot64 (uint64_t x, int k)
static uint64_t	Rot64 (uint64_t x, int k)

Private Attributes
uint64_t	m_a
uint64_t	m_b
uint64_t	m_c
uint64_t	m_d

Detailed Description

Definition at line 48 of file SpookyHashV1Test.cpp.

Member Function Documentation

void Random::Init ( uint64_t  seed )

inline

Definition at line 61 of file SpookyHashV1Test.cpp.

References i, m_a, m_b, m_c, m_d, seed, and Value().

Referenced by TestDeltas().

    {
        m_a = 0xdeadbeef;
        m_b = m_c = m_d = seed;
        for (int i = 0; i < 20; ++i) {
          (void)Value();
        }
    }

void Random::Init ( uint64_t  seed )

inline

Definition at line 61 of file SpookyHashV2Test.cpp.

References i, m_a, m_b, m_c, m_d, seed, and Value().

    {
        m_a = 0xdeadbeef;
        m_b = m_c = m_d = seed;
        for (int i = 0; i < 20; ++i) {
          (void)Value();
        }
    }

static uint64_t Random::Rot64 ( uint64_t  x, int  k  )

inlinestaticprivate

Definition at line 71 of file SpookyHashV2Test.cpp.

References k, m_a, m_b, m_c, m_d, and uint64_t.

    {
        return (x << k) | (x >> (64-(k)));
    }

static uint64_t Random::Rot64 ( uint64_t  x, int  k  )

inlinestaticprivate

Definition at line 71 of file SpookyHashV1Test.cpp.

References k.

Referenced by Value().

    {
        return (x << k) | (x >> (64-(k)));
    }

uint64_t Random::Value ( )

inline

Definition at line 51 of file SpookyHashV2Test.cpp.

References m_a, m_b, m_c, m_d, Rot64(), and uint64_t.

    {
        uint64_t e = m_a - Rot64(m_b, 23);
        m_a = m_b ^ Rot64(m_c, 16);
        m_b = m_c + Rot64(m_d, 11);
        m_c = m_d + e;
        m_d = e + m_a;
        return m_d;
    }

uint64_t Random::Value ( )

inline

Definition at line 51 of file SpookyHashV1Test.cpp.

References m_a, m_b, m_c, m_d, Rot64(), and uint64_t.

Referenced by Init(), and TestDeltas().

    {
        uint64_t e = m_a - Rot64(m_b, 23);
        m_a = m_b ^ Rot64(m_c, 16);
        m_b = m_c + Rot64(m_d, 11);
        m_c = m_d + e;
        m_d = e + m_a;
        return m_d;
    }

Member Data Documentation

uint64_t Random::m_a

private

Definition at line 76 of file SpookyHashV1Test.cpp.

Referenced by Init(), Rot64(), and Value().

uint64_t Random::m_b

private

Definition at line 77 of file SpookyHashV1Test.cpp.

Referenced by Init(), Rot64(), and Value().

uint64_t Random::m_c

private

Definition at line 78 of file SpookyHashV1Test.cpp.

Referenced by Init(), Rot64(), and Value().

uint64_t Random::m_d

private

Definition at line 79 of file SpookyHashV1Test.cpp.

Referenced by Init(), Rot64(), and Value().

---

The documentation for this class was generated from the following files:

• proxygen/folly/folly/hash/test/SpookyHashV1Test.cpp
• proxygen/folly/folly/hash/test/SpookyHashV2Test.cpp