1 files changed, 77 insertions, 0 deletions
diff --git a/src/deps/skia/include/sksl/DSLWrapper.h b/src/deps/skia/include/sksl/DSLWrapper.h
new file mode 100644
index 000000000..96daa22dd
--- /dev/null
+++ b/src/deps/skia/include/sksl/DSLWrapper.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2021 Google LLC.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SKSL_DSL_WRAPPER
+#define SKSL_DSL_WRAPPER
+
+#include <memory>
+
+namespace SkSL {
+
+namespace dsl {
+
+/**
+ * Several of the DSL classes override operator= in a non-standard fashion to allow for expressions
+ * like "x = 0" to compile into SkSL code. This makes it impossible to directly use these classes in
+ * C++ containers which expect standard behavior for operator=.
+ *
+ * Wrapper<T> contains a T, where T is a DSL class with non-standard operator=, and provides
+ * standard behavior for operator=, permitting it to be used in standard containers.
+ */
+template<typename T>
+class DSLWrapper {
+public:
+    DSLWrapper(T value) {
+        fValue.swap(value);
+    }
+
+    DSLWrapper(const DSLWrapper&) = delete;
+
+    DSLWrapper(DSLWrapper&& other) {
+        fValue.swap(other.fValue);
+    }
+
+    T& get() {
+        return fValue;
+    }
+
+    T& operator*() {
+        return fValue;
+    }
+
+    T* operator->() {
+        return &fValue;
+    }
+
+    const T& get() const {
+        return fValue;
+    }
+
+    const T& operator*() const {
+        return fValue;
+    }
+
+    const T* operator->() const {
+        return &fValue;
+    }
+
+    DSLWrapper& operator=(const DSLWrapper&) = delete;
+
+    DSLWrapper& operator=(DSLWrapper&& other) {
+        fValue.swap(other.fValue);
+        return *this;
+    }
+
+private:
+    T fValue;
+};
+
+} // namespace dsl
+
+} // namespace SkSL
+
+#endif