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1 /* | 1 /* |
2 * Copyright (C) 2008 Apple Inc. All rights reserved. | 2 * Copyright (C) 2008 Apple Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 */ | 27 */ |
28 | 28 |
29 #ifndef AtomicStringHash_h | 29 #ifndef AtomicStringHash_h |
30 #define AtomicStringHash_h | 30 #define AtomicStringHash_h |
31 | 31 |
| 32 #include "wtf/HashTraits.h" |
32 #include "wtf/text/AtomicString.h" | 33 #include "wtf/text/AtomicString.h" |
33 #include "wtf/HashTraits.h" | |
34 | 34 |
35 namespace WTF { | 35 namespace WTF { |
36 | 36 |
37 struct AtomicStringHash { | 37 struct AtomicStringHash { |
38 static unsigned hash(const AtomicString& key) | 38 static unsigned hash(const AtomicString& key) |
39 { | 39 { |
40 return key.impl()->existingHash(); | 40 return key.impl()->existingHash(); |
41 } | 41 } |
42 | 42 |
43 static bool equal(const AtomicString& a, const AtomicString& b) | 43 static bool equal(const AtomicString& a, const AtomicString& b) |
44 { | 44 { |
45 return a == b; | 45 return a == b; |
46 } | 46 } |
47 | 47 |
48 static const bool safeToCompareToEmptyOrDeleted = false; | 48 static const bool safeToCompareToEmptyOrDeleted = false; |
49 }; | 49 }; |
50 | 50 |
51 // AtomicStringHash is the default hash for AtomicString | 51 // AtomicStringHash is the default hash for AtomicString |
52 template<> struct HashTraits<AtomicString> : SimpleClassHashTraits<AtomicStr
ing> { | 52 template<> struct HashTraits<AtomicString> : SimpleClassHashTraits<AtomicString>
{ |
53 // Unlike other types, we can return a const reference for AtomicString'
s empty value (nullAtom). | 53 // Unlike other types, we can return a const reference for AtomicString's |
54 typedef const AtomicString& PeekOutType; | 54 // empty value (nullAtom). |
| 55 typedef const AtomicString& PeekOutType; |
55 | 56 |
56 static const AtomicString& emptyValue() { return nullAtom; } | 57 static const AtomicString& emptyValue() { return nullAtom; } |
57 static PeekOutType peek(const AtomicString& value) { return value; } | 58 static PeekOutType peek(const AtomicString& value) { return value; } |
58 | 59 |
59 static const bool hasIsEmptyValueFunction = true; | 60 static const bool hasIsEmptyValueFunction = true; |
60 static bool isEmptyValue(const AtomicString& value) { return value.isNul
l(); } | 61 static bool isEmptyValue(const AtomicString& value) { return value.isNull();
} |
61 }; | 62 }; |
62 | 63 |
63 } | 64 } |
64 | 65 |
65 using WTF::AtomicStringHash; | 66 using WTF::AtomicStringHash; |
66 | 67 |
67 #endif | 68 #endif |
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