fable: Add to_json() method to all schema types

fable/include/fable/schema.hpp

@@ -246,15 +246,10 @@ class Schema : public schema::Interface {
     return j;
   }
 
-  Json to_json() const {
-    Json j;
-    to_json(j);
-    return j;
-  }
-
   friend void to_json(Json& j, const Schema& s) { s.impl_->to_json(j); }
 
  public:  // Overrides
+  using Interface::to_json;
   operator schema::Box() const { return schema::Box{impl_}; }
   Interface* clone() const override { return impl_->clone(); }
   JsonType type() const override { return impl_->type(); }

fable/include/fable/schema/array.hpp

@@ -124,6 +124,7 @@ class Array : public Base<Array<T, P>> {
     }
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/boolean.hpp

@@ -50,6 +50,7 @@ class Boolean : public Base<Boolean> {
 
   void validate(const Conf& c) const override { this->validate_type(c); }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/confable.hpp

@@ -76,6 +76,7 @@ class FromConfable : public Base<FromConfable<T>> {
     }
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     ptr_->to_json(j);

fable/include/fable/schema/const.hpp

@@ -71,6 +71,7 @@ class Const : public Base<Const<T, P>> {
     }
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override { j = serialize(constant_); }
 
   void from_conf(const Conf& c) override { validate(c); }

fable/include/fable/schema/duration.hpp

@@ -125,6 +125,7 @@ class Duration : public Base<Duration<T, Period>> {
     }
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/enum.hpp

@@ -73,6 +73,7 @@ class Enum : public Base<Enum<T>> {
     }
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/factory.hpp

@@ -280,6 +280,7 @@ class FactoryBase : public Base<CRTP> {
     throw std::logic_error("FactoryBase::from_conf() should not be used");
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     throw std::logic_error("FactoryBase::to_json() should not be used");
   }

fable/include/fable/schema/ignore.hpp

@@ -56,6 +56,7 @@ class Ignore : public Base<Ignore> {
   }
 
   void validate(const Conf&) const override {}
+  using Interface::to_json;
   void to_json(Json& j) const override { j = nullptr; }
   void from_conf(const Conf&) override {}
   void reset_ptr() override {}

fable/include/fable/schema/interface.hpp

@@ -211,6 +211,18 @@ class Interface {
     return true;
   }
 
+  /**
+   * Return the current value of the destination.
+   *
+   * Warning: This is NOT an efficient operation, but it can be useful for
+   * cases where speed is not important.
+   */
+  virtual Json to_json() const {
+    Json j;
+    to_json(j);
+    return j;
+  }
+
   /**
    * Return the current value of the destination.
    *
@@ -306,6 +318,7 @@ class Box : public Interface {
   }
 
  public:  // Overrides
+  using Interface::to_json;
   Interface* clone() const override { return impl_->clone(); }
   JsonType type() const override { return impl_->type(); }
   std::string type_string() const override { return impl_->type_string(); }

fable/include/fable/schema/json.hpp

@@ -64,6 +64,7 @@ class FromJson : public Base<FromJson<T>> {
 
   void validate(const Conf& c) const override { this->validate_type(c); }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = static_cast<const Type&>(*ptr_);

fable/include/fable/schema/map.hpp

@@ -140,6 +140,7 @@ class Map : public Base<Map<T, P>> {
     }
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/number.hpp

@@ -196,6 +196,7 @@ class Number : public Base<Number<T>> {
     }
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/optional.hpp

@@ -81,6 +81,7 @@ class Optional : public Base<Optional<T, P>> {
     prototype_.validate(c);
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/passthru.hpp

@@ -72,6 +72,7 @@ class Passthru : public Base<Passthru<P>> {
     prototype_.validate(c);
   }
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = **ptr_;

fable/include/fable/schema/path.hpp

@@ -182,6 +182,7 @@ class Path : public Base<Path> {
   Json json_schema() const override;
   void validate(const Conf& c) const override;
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/string.hpp

@@ -97,6 +97,7 @@ class String : public Base<String> {
   Json json_schema() const override;
   void validate(const Conf& c) const override;
 
+  using Interface::to_json;
   void to_json(Json& j) const override {
     assert(ptr_ != nullptr);
     j = serialize(*ptr_);

fable/include/fable/schema/struct.hpp

@@ -202,6 +202,7 @@ class Struct : public Base<Struct> {
   void reset_ptr() override;
 
  public:  // Overrides
+  using Interface::to_json;
   Json usage() const override;
   Json json_schema() const override;
   void validate(const Conf& c) const override;

fable/include/fable/schema/variant.hpp

@@ -104,6 +104,7 @@ class Variant : public Interface {
   }
 
  public:  // Overrides
+  using Interface::to_json;
   Json json_schema() const override;
   void validate(const Conf& c) const override { validate_index(c); }
   void to_json(Json& j) const override { schemas_[0].to_json(j); }