rpc: Move OuterType enum to header

This is needed so that it can be used by RPCResult

Also,
* rename NAMED_ARG to NONE for generalization.
* change RPCArg constructors to initialize the members by moving values

src/rpc/util.cpp

@@ -311,21 +311,10 @@ struct Sections {
         m_sections.push_back(s);
     }
 
-    /**
-     * Serializing RPCArgs depends on the outer type. Only arrays and
-     * dictionaries can be nested in json. The top-level outer type is "named
-     * arguments", a mix between a dictionary and arrays.
-     */
-    enum class OuterType {
-        ARR,
-        OBJ,
-        NAMED_ARG, // Only set on first recursion
-    };
-
     /**
      * Recursive helper to translate an RPCArg into sections
      */
-    void Push(const RPCArg& arg, const size_t current_indent = 5, const OuterType outer_type = OuterType::NAMED_ARG)
+    void Push(const RPCArg& arg, const size_t current_indent = 5, const OuterType outer_type = OuterType::NONE)
     {
         const auto indent = std::string(current_indent, ' ');
         const auto indent_next = std::string(current_indent + 2, ' ');
@@ -338,7 +327,7 @@ struct Sections {
         case RPCArg::Type::AMOUNT:
         case RPCArg::Type::RANGE:
         case RPCArg::Type::BOOL: {
-            if (outer_type == OuterType::NAMED_ARG) return; // Nothing more to do for non-recursive types on first recursion
+            if (outer_type == OuterType::NONE) return; // Nothing more to do for non-recursive types on first recursion
             auto left = indent;
             if (arg.m_type_str.size() != 0 && push_name) {
                 left += "\"" + arg.m_name + "\": " + arg.m_type_str.at(0);
@@ -351,28 +340,28 @@ struct Sections {
         }
         case RPCArg::Type::OBJ:
         case RPCArg::Type::OBJ_USER_KEYS: {
-            const auto right = outer_type == OuterType::NAMED_ARG ? "" : arg.ToDescriptionString();
+            const auto right = outer_type == OuterType::NONE ? "" : arg.ToDescriptionString();
             PushSection({indent + (push_name ? "\"" + arg.m_name + "\": " : "") + "{", right});
             for (const auto& arg_inner : arg.m_inner) {
                 Push(arg_inner, current_indent + 2, OuterType::OBJ);
             }
             if (arg.m_type != RPCArg::Type::OBJ) {
                 PushSection({indent_next + "...", ""});
             }
-            PushSection({indent + "}" + (outer_type != OuterType::NAMED_ARG ? "," : ""), ""});
+            PushSection({indent + "}" + (outer_type != OuterType::NONE ? "," : ""), ""});
             break;
         }
         case RPCArg::Type::ARR: {
             auto left = indent;
             left += push_name ? "\"" + arg.m_name + "\": " : "";
             left += "[";
-            const auto right = outer_type == OuterType::NAMED_ARG ? "" : arg.ToDescriptionString();
+            const auto right = outer_type == OuterType::NONE ? "" : arg.ToDescriptionString();
             PushSection({left, right});
             for (const auto& arg_inner : arg.m_inner) {
                 Push(arg_inner, current_indent + 2, OuterType::ARR);
             }
             PushSection({indent_next + "...", ""});
-            PushSection({indent + "]" + (outer_type != OuterType::NAMED_ARG ? "," : ""), ""});
+            PushSection({indent + "]" + (outer_type != OuterType::NONE ? "," : ""), ""});
             break;
         }
 

src/rpc/util.h

@@ -101,6 +101,16 @@ std::vector<CScript> EvalDescriptorStringOrObject(const UniValue& scanobject, Fl
 /** Returns, given services flags, a list of humanly readable (known) network services */
 UniValue GetServicesNames(ServiceFlags services);
 
+/**
+ * Serializing JSON objects depends on the outer type. Only arrays and
+ * dictionaries can be nested in json. The top-level outer type is "NONE".
+ */
+enum class OuterType {
+    ARR,
+    OBJ,
+    NONE, // Only set on first recursion
+};
+
 struct RPCArg {
     enum class Type {
         OBJ,
@@ -140,37 +150,37 @@ struct RPCArg {
     const std::vector<std::string> m_type_str; //!< Should be empty unless it is supposed to override the auto-generated type strings. Vector length is either 0 or 2, m_type_str.at(0) will override the type of the value in a key-value pair, m_type_str.at(1) will override the type in the argument description.
 
     RPCArg(
-        const std::string& name,
-        const Type& type,
-        const Fallback& fallback,
-        const std::string& description,
-        const std::string& oneline_description = "",
-        const std::vector<std::string>& type_str = {})
-        : m_name{name},
-          m_type{type},
-          m_fallback{fallback},
-          m_description{description},
-          m_oneline_description{oneline_description},
-          m_type_str{type_str}
+        const std::string name,
+        const Type type,
+        const Fallback fallback,
+        const std::string description,
+        const std::string oneline_description = "",
+        const std::vector<std::string> type_str = {})
+        : m_name{std::move(name)},
+          m_type{std::move(type)},
+          m_fallback{std::move(fallback)},
+          m_description{std::move(description)},
+          m_oneline_description{std::move(oneline_description)},
+          m_type_str{std::move(type_str)}
     {
         CHECK_NONFATAL(type != Type::ARR && type != Type::OBJ);
     }
 
     RPCArg(
-        const std::string& name,
-        const Type& type,
-        const Fallback& fallback,
-        const std::string& description,
-        const std::vector<RPCArg>& inner,
-        const std::string& oneline_description = "",
-        const std::vector<std::string>& type_str = {})
-        : m_name{name},
-          m_type{type},
-          m_inner{inner},
-          m_fallback{fallback},
-          m_description{description},
-          m_oneline_description{oneline_description},
-          m_type_str{type_str}
+        const std::string name,
+        const Type type,
+        const Fallback fallback,
+        const std::string description,
+        const std::vector<RPCArg> inner,
+        const std::string oneline_description = "",
+        const std::vector<std::string> type_str = {})
+        : m_name{std::move(name)},
+          m_type{std::move(type)},
+          m_inner{std::move(inner)},
+          m_fallback{std::move(fallback)},
+          m_description{std::move(description)},
+          m_oneline_description{std::move(oneline_description)},
+          m_type_str{std::move(type_str)}
     {
         CHECK_NONFATAL(type == Type::ARR || type == Type::OBJ);
     }