1 files changed, 27 insertions, 0 deletions
diff --git a/src/UniqueString.cxx b/src/UniqueString.cxx
index dcbdc441c..aadc2ae7e 100644
--- a/src/UniqueString.cxx
+++ b/src/UniqueString.cxx
@@ -6,6 +6,7 @@
 // The License.txt file describes the conditions under which this software may be distributed.
 
 #include <cstring>
+#include <vector>
 #include <algorithm>
 #include <memory>
 
@@ -25,4 +26,30 @@ UniqueString UniqueStringCopy(const char *text) {
 	return UniqueString(upcNew.release());
 }
 
+// A set of strings that always returns the same pointer for each string.
+
+UniqueStringSet::UniqueStringSet() noexcept = default;
+
+UniqueStringSet::~UniqueStringSet() {
+	strings.clear();
+}
+
+void UniqueStringSet::Clear() noexcept {
+	strings.clear();
+}
+
+const char *UniqueStringSet::Save(const char *text) {
+	if (!text)
+		return nullptr;
+
+	for (const UniqueString &us : strings) {
+		if (text == us.get()) {
+			return us.get();
+		}
+	}
+
+	strings.push_back(UniqueStringCopy(text));
+	return strings.back().get();
+}
+
 }