Fix building with Xcode 12 by defining move constructors for FontAlias, Style,

and PositionCacheEntry.

4 files changed, 21 insertions, 4 deletions

diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 6293b880a..1fcfee6fd 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -573,6 +573,18 @@
       </li>
     </ul>
     <h3>
+       <a href="https://www.scintilla.org/scite445.zip">Release 4.4.6</a>
+    </h3>
+    <ul>
+	<li>
+	Released 11 September 2020.
+	</li>
+	<li>
+	Fix building with Xcode 12.
+	<a href="https://sourceforge.net/p/scintilla/bugs/2187/">Bug #2187</a>.
+	</li>
+    </ul>
+    <h3>
        <a href="https://www.scintilla.org/scite445.zip">Release 4.4.5</a>
     </h3>
     <ul>
diff --git a/src/PositionCache.h b/src/PositionCache.h
index cdcc3ef74..7573a2dc3 100644
--- a/src/PositionCache.h
+++ b/src/PositionCache.h
@@ -187,8 +187,8 @@ public:
 	PositionCacheEntry() noexcept;
 	// Copy constructor not currently used, but needed for being element in std::vector.
 	PositionCacheEntry(const PositionCacheEntry &);
+	PositionCacheEntry(PositionCacheEntry &&) noexcept = default;
 	// Deleted so PositionCacheEntry objects can not be assigned.
-	PositionCacheEntry(PositionCacheEntry &&) = delete;
 	void operator=(const PositionCacheEntry &) = delete;
 	void operator=(PositionCacheEntry &&) = delete;
 	~PositionCacheEntry();
diff --git a/src/Style.cxx b/src/Style.cxx
index 00497db67..ff2b49bc2 100644
--- a/src/Style.cxx
+++ b/src/Style.cxx
@@ -24,6 +24,11 @@ FontAlias::FontAlias(const FontAlias &other) noexcept : Font() {
 	SetID(other.fid);
 }
 
+FontAlias::FontAlias(FontAlias &&other) noexcept : Font() {
+	SetID(other.fid);
+	other.ClearFont();
+}
+
 FontAlias::~FontAlias() {
 	SetID(FontID{});
 	// ~Font will not release the actual font resource since it is now 0
diff --git a/src/Style.h b/src/Style.h
index 432dcf946..071d752ca 100644
--- a/src/Style.h
+++ b/src/Style.h
@@ -33,9 +33,9 @@ struct FontSpecification {
 class FontAlias : public Font {
 public:
 	FontAlias() noexcept;
-	// FontAlias objects can not be assigned except for initialization
+	// FontAlias objects can be copy or move constructed but not be assigned
 	FontAlias(const FontAlias &) noexcept;
-	FontAlias(FontAlias &&)  = delete;
+	FontAlias(FontAlias &&) noexcept;
 	FontAlias &operator=(const FontAlias &) = delete;
 	FontAlias &operator=(FontAlias &&) = delete;
 	~FontAlias() override;
@@ -72,7 +72,7 @@ public:
 
 	Style();
 	Style(const Style &source) noexcept;
-	Style(Style &&) = delete;
+	Style(Style &&) noexcept = default;
 	~Style();
 	Style &operator=(const Style &source) noexcept;
 	Style &operator=(Style &&) = delete;