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.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/UniqueString.h b/src/UniqueString.h
index 44ba26652..f7f7ebbdc 100644
--- a/src/UniqueString.h
+++ b/src/UniqueString.h
@@ -2,6 +2,8 @@
 /** @file UniqueString.h
  ** Define UniqueString, a unique_ptr based string type for storage in containers
  ** and an allocator for UniqueString.
+ ** Define UniqueStringSet which holds a set of strings, used to avoid holding many copies
+ ** of font names.
  **/
 // Copyright 2017 by Neil Hodgson <neilh@scintilla.org>
 // The License.txt file describes the conditions under which this software may be distributed.
@@ -21,6 +23,24 @@ using UniqueString = std::unique_ptr<const char[]>;
 /// into collections.
 UniqueString UniqueStringCopy(const char *text);
 
+// A set of strings that always returns the same pointer for each string.
+
+class UniqueStringSet {
+private:
+	std::vector<UniqueString> strings;
+public:
+	UniqueStringSet() noexcept;
+	// UniqueStringSet objects can not be copied.
+	UniqueStringSet(const UniqueStringSet &) = delete;
+	UniqueStringSet &operator=(const UniqueStringSet &) = delete;
+	// UniqueStringSet objects can be moved.
+	UniqueStringSet(UniqueStringSet &&) = default;
+	UniqueStringSet &operator=(UniqueStringSet &&) = default;
+	~UniqueStringSet();
+	void Clear() noexcept;
+	const char *Save(const char *text);
+};
+
 }
 
 #endif