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[ADT] Add a 'find_as' operation to DenseSet.

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This operation is analogous to its counterpart in DenseMap: It allows lookup
via cheap-to-construct keys (provided that getHashValue and isEqual are
implemented for the cheap key-type in the DenseMapInfo specialization).

Thanks to Chandler for the review.

llvm-svn: 220168
This commit is contained in:
Lang Hames 2014-10-19 19:36:33 +00:00
parent 4f93ec40bc
commit 9793d69437
2 changed files with 53 additions and 0 deletions
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15
include/llvm/ADT/DenseSet.h
View File

@ -110,6 +110,21 @@ public:
const_iterator end() const { return ConstIterator(TheMap.end()); }
iterator find(const ValueT &V) { return Iterator(TheMap.find(V)); }
/// Alternative version of find() which allows a different, and possibly less
/// expensive, key type.
/// The DenseMapInfo is responsible for supplying methods
/// getHashValue(LookupKeyT) and isEqual(LookupKeyT, KeyT) for each key type
/// used.
template <class LookupKeyT>
iterator find_as(const LookupKeyT &Val) {
return Iterator(TheMap.find_as(Val));
}
template <class LookupKeyT>
const_iterator find_as(const LookupKeyT &Val) const {
return ConstIterator(TheMap.find_as(Val));
}
void erase(Iterator I) { return TheMap.erase(I.I); }
void erase(ConstIterator CI) { return TheMap.erase(CI.I); }

38
unittests/ADT/DenseSetTest.cpp
View File

@ -27,4 +27,42 @@ TEST_F(DenseSetTest, DoubleEntrySetTest) {
EXPECT_EQ(0u, set.count(2));
}
struct TestDenseSetInfo {
static inline unsigned getEmptyKey() { return ~0; }
static inline unsigned getTombstoneKey() { return ~0U - 1; }
static unsigned getHashValue(const unsigned& Val) { return Val * 37U; }
static unsigned getHashValue(const char* Val) {
return (unsigned)(Val[0] - 'a') * 37U;
}
static bool isEqual(const unsigned& LHS, const unsigned& RHS) {
return LHS == RHS;
}
static bool isEqual(const char* LHS, const unsigned& RHS) {
return (unsigned)(LHS[0] - 'a') == RHS;
}
};
TEST(DenseSetCustomTest, FindAsTest) {
DenseSet<unsigned, TestDenseSetInfo> set;
set.insert(0);
set.insert(1);
set.insert(2);
// Size tests
EXPECT_EQ(3u, set.size());
// Normal lookup tests
EXPECT_EQ(1u, set.count(1));
EXPECT_EQ(0u, *set.find(0));
EXPECT_EQ(1u, *set.find(1));
EXPECT_EQ(2u, *set.find(2));
EXPECT_TRUE(set.find(3) == set.end());
// find_as() tests
EXPECT_EQ(0u, *set.find_as("a"));
EXPECT_EQ(1u, *set.find_as("b"));
EXPECT_EQ(2u, *set.find_as("c"));
EXPECT_TRUE(set.find_as("d") == set.end());
}
}