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Make variant's index part of the hash value

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@288554 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2016-12-02 23:38:31 +00:00
parent 4975ccc637
commit 120401a4e0
4 changed files with 31 additions and 10 deletions
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13
src/experimental/filesystem/path.cpp
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@@ -6,6 +6,7 @@
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#undef NDEBUG
#include "experimental/filesystem"
#include "string_view"
#include "utility"
@@ -390,19 +391,13 @@ int path::__compare(string_view_t __s) const {
// path.nonmembers
size_t hash_value(const path& __p) noexcept {
auto PP = PathParser::CreateBegin(__p.native());
struct HashPairT {
size_t first;
size_t second;
};
HashPairT hp = {0, 0};
size_t hash_value = 0;
std::hash<string_view> hasher;
std::__scalar_hash<decltype(hp)> pair_hasher;
while (PP) {
hp.second = hasher(*PP);
hp.first = pair_hasher(hp);
hash_value = __hash_combine(hash_value, hasher(*PP));
++PP;
}
return hp.first;
return hash_value;
}
////////////////////////////////////////////////////////////////////////////