+ //
+ // Function to determine if the value should be quoted.
+ //static bool mustQuote(StringRef);
+};
+
+
+/// This class should be specialized by type that requires custom conversion
+/// to/from a YAML literal block scalar. For example:
+///
+/// template <>
+/// struct BlockScalarTraits<MyType> {
+/// static void output(const MyType &Value, void*, llvm::raw_ostream &Out)
+/// {
+/// // stream out custom formatting
+/// Out << Val;
+/// }
+/// static StringRef input(StringRef Scalar, void*, MyType &Value) {
+/// // parse scalar and set `value`
+/// // return empty string on success, or error string
+/// return StringRef();
+/// }
+/// };
+template <typename T>
+struct BlockScalarTraits {
+ // Must provide:
+ //
+ // Function to write the value as a string:
+ // static void output(const T &Value, void *ctx, llvm::raw_ostream &Out);
+ //
+ // Function to convert a string to a value. Returns the empty
+ // StringRef on success or an error string if string is malformed:
+ // static StringRef input(StringRef Scalar, void *ctxt, T &Value);