dart::DefaultHashTraits Class Reference

Static Public Member Functions
static const char *	Name ()
static bool	ReportStats ()
static bool	IsMatch (const Object &a, const Object &b)
static uword	Hash (const Object &obj)

Detailed Description

Definition at line 25056 of file object.cc.

Member Function Documentation

Hash()

static uword dart::DefaultHashTraits::Hash ( const Object &  obj )

inlinestatic

Definition at line 25068 of file object.cc.

                                       {
    if (obj.IsNull()) {
      return 0;
    }
    // TODO(koda): Ensure VM classes only produce Smi hash codes, and remove
    // non-Smi cases once Dart-side implementation is complete.
    Thread* thread = Thread::Current();
    REUSABLE_INSTANCE_HANDLESCOPE(thread);
    Instance& hash_code = thread->InstanceHandle();
    hash_code ^= Instance::Cast(obj).HashCode();
    if (hash_code.IsSmi()) {
      // May waste some bits on 64-bit, to ensure consistency with non-Smi case.
      return static_cast<uword>(Smi::Cast(hash_code).AsTruncatedUint32Value());
    } else if (hash_code.IsInteger()) {
      return static_cast<uword>(
          Integer::Cast(hash_code).AsTruncatedUint32Value());
    } else {
      return 0;
    }
  }

IsMatch()

static bool dart::DefaultHashTraits::IsMatch ( const Object &  a, const Object &  b  )

inlinestatic

Definition at line 25061 of file object.cc.

                                                        {
    if (a.IsNull() || b.IsNull()) {
      return (a.IsNull() && b.IsNull());
    } else {
      return Instance::Cast(a).OperatorEquals(Instance::Cast(b));
    }
  }

Name()

static const char * dart::DefaultHashTraits::Name ( )

inlinestatic

Definition at line 25058 of file object.cc.

{ return "DefaultHashTraits"; }

ReportStats()

static bool dart::DefaultHashTraits::ReportStats ( )

inlinestatic

Definition at line 25059 of file object.cc.

{ return false; }

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

• third_party/dart-lang/sdk/runtime/vm/object.cc