From 4a44fd852450d9e97032633524f92d1fad5f7187 Mon Sep 17 00:00:00 2001
From: Neil <nyamatongwe@gmail.com>
Date: Mon, 8 Apr 2019 08:34:52 +1000
Subject: Backport: Rename FontNames to UniqueStringSet and move into
 UniqueString. It may be useful in more situations than just font names.

Backport of changeset 7409:a70a4ee51448.
---
 src/UniqueString.cxx | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'src/UniqueString.cxx')

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();
+}
+
 }
-- 
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