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authorSimon Marchi <simon.marchi@efficios.com>2022-10-20 13:05:19 -0400
committerSimon Marchi <simon.marchi@polymtl.ca>2023-01-05 14:38:51 -0500
commit1a8605a8c79b0c4ebc71f5691e36a1338d407837 (patch)
treeecef4a6328ed0a9185e6424bbd7182d092840b17 /gdbsupport
parent72127b193c970a61a36c940bf167c596ddc32eae (diff)
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gdbsupport: add gdb::string_view_hash
Add the string_view_hash type, which will be useful to be able to use gdb::string_view as std::unordered_map keys. Use it in gdb/symtab.c, to exercise it. Change-Id: Id69a466ab19a9f6620b5df8a2dd29b5cddd94c00 Approved-By: Andrew Burgess <aburgess@redhat.com>
Diffstat (limited to 'gdbsupport')
-rw-r--r--gdbsupport/common-utils.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/gdbsupport/common-utils.h b/gdbsupport/common-utils.h
index 31ab1a6..97dcb9f 100644
--- a/gdbsupport/common-utils.h
+++ b/gdbsupport/common-utils.h
@@ -209,4 +209,21 @@ fast_hash (const void *ptr, size_t len, unsigned int start_value = 0)
#endif
}
+namespace gdb
+{
+
+/* Hash type for gdb::string_view.
+
+ Even after we switch to C++17 and dump our string_view implementation, we
+ might want to keep this hash implementation if it's faster than std::hash
+ for std::string_view. */
+
+struct string_view_hash
+{
+ std::size_t operator() (gdb::string_view view) const
+ { return fast_hash (view.data (), view.length ()); }
+};
+
+} /* namespace gdb */
+
#endif /* COMMON_COMMON_UTILS_H */