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Teach the hashing facilities how to hash std::string objects.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152000 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2012-03-04 10:23:15 +00:00
parent 21d60d5161
commit 9406da6e66
2 changed files with 28 additions and 0 deletions
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11
include/llvm/ADT/Hashing.h
View File

@ -124,6 +124,10 @@ template <typename T> hash_code hash_value(const T *ptr);
template <typename T, typename U>
hash_code hash_value(const std::pair<T, U> &arg);
/// \brief Compute a hash_code for a standard string.
template <typename T>
hash_code hash_value(const std::basic_string<T> &arg);
/// \brief Override the execution seed with a fixed value.
///
@ -748,6 +752,13 @@ hash_code hash_value(const std::pair<T, U> &arg) {
return hash_combine(arg.first, arg.second);
}
// Declared and documented above, but defined here so that any of the hashing
// infrastructure is available.
template <typename T>
hash_code hash_value(const std::basic_string<T> &arg) {
return hash_combine_range(arg.begin(), arg.end());
}
} // namespace llvm
#endif

17
unittests/ADT/HashingTest.cpp
View File

@ -97,6 +97,23 @@ TEST(HashingTest, HashValueStdPair) {
hash_value(std::make_pair(obj1, std::make_pair(obj2, obj3))));
}
TEST(HashingTest, HashValueStdString) {
std::string s = "Hello World!";
EXPECT_EQ(hash_combine_range(s.c_str(), s.c_str() + s.size()), hash_value(s));
EXPECT_EQ(hash_combine_range(s.c_str(), s.c_str() + s.size() - 1),
hash_value(s.substr(0, s.size() - 1)));
EXPECT_EQ(hash_combine_range(s.c_str() + 1, s.c_str() + s.size() - 1),
hash_value(s.substr(1, s.size() - 2)));
std::wstring ws = L"Hello Wide World!";
EXPECT_EQ(hash_combine_range(ws.c_str(), ws.c_str() + ws.size()),
hash_value(ws));
EXPECT_EQ(hash_combine_range(ws.c_str(), ws.c_str() + ws.size() - 1),
hash_value(ws.substr(0, ws.size() - 1)));
EXPECT_EQ(hash_combine_range(ws.c_str() + 1, ws.c_str() + ws.size() - 1),
hash_value(ws.substr(1, ws.size() - 2)));
}
template <typename T, size_t N> T *begin(T (&arr)[N]) { return arr; }
template <typename T, size_t N> T *end(T (&arr)[N]) { return arr + N; }