Improve message when user forgets third arg of serializeJson() et al.

See #1449, #1491, #1543, #1665, and #2122

CHANGELOG.md

@@ -7,6 +7,7 @@ HEAD
 * Store object members with two slots: one for the key and one for the value
 * Store 64-bit numbers (`double` and `long long`) in an additional slot
 * Reduce the slot size (see table below)
+* Improve message when user forgets third arg of `serializeJson()` et al.
 
 | Architecture | before   | after    |
 |--------------|----------|----------|

src/ArduinoJson/Json/JsonSerializer.hpp

@@ -129,7 +129,8 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 // Produces a minified JSON document.
 // https://arduinojson.org/v7/api/json/serializejson/
 template <typename TDestination>
-size_t serializeJson(JsonVariantConst source, TDestination& destination) {
+detail::enable_if_t<!detail::is_pointer<TDestination>::value, size_t>
+serializeJson(JsonVariantConst source, TDestination& destination) {
   using namespace detail;
   return serialize<JsonSerializer>(source, destination);
 }

src/ArduinoJson/Json/PrettyJsonSerializer.hpp

@@ -84,7 +84,8 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 // Produces JsonDocument to create a prettified JSON document.
 // https://arduinojson.org/v7/api/json/serializejsonpretty/
 template <typename TDestination>
-size_t serializeJsonPretty(JsonVariantConst source, TDestination& destination) {
+detail::enable_if_t<!detail::is_pointer<TDestination>::value, size_t>
+serializeJsonPretty(JsonVariantConst source, TDestination& destination) {
   using namespace ArduinoJson::detail;
   return serialize<PrettyJsonSerializer>(source, destination);
 }

src/ArduinoJson/MsgPack/MsgPackSerializer.hpp

@@ -219,7 +219,8 @@ ARDUINOJSON_BEGIN_PUBLIC_NAMESPACE
 // Produces a MessagePack document.
 // https://arduinojson.org/v7/api/msgpack/serializemsgpack/
 template <typename TDestination>
-inline size_t serializeMsgPack(JsonVariantConst source, TDestination& output) {
+detail::enable_if_t<!detail::is_pointer<TDestination>::value, size_t>
+serializeMsgPack(JsonVariantConst source, TDestination& output) {
   using namespace ArduinoJson::detail;
   return serialize<MsgPackSerializer>(source, output);
 }