Redesigned JsonVariant to leverage converting constructors instead of assignment operators

include/ArduinoJson/JsonVariant.ipp

@@ -0,0 +1,179 @@
+// Copyright Benoit Blanchon 2014-2015
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+
+#pragma once
+
+#include "JsonVariant.hpp"
+
+namespace ArduinoJson {
+
+inline JsonVariant::JsonVariant(bool value) {
+  _type = Internals::JSON_BOOLEAN;
+  _content.asBoolean = value;
+}
+
+inline JsonVariant::JsonVariant(const char *value) {
+  _type = Internals::JSON_STRING;
+  _content.asString = value;
+}
+
+inline JsonVariant::JsonVariant(double value, uint8_t decimals) {
+  _type = static_cast<Internals::JsonVariantType>(
+      Internals::JSON_DOUBLE_0_DECIMALS + decimals);
+  _content.asDouble = value;
+}
+
+inline JsonVariant::JsonVariant(float value, uint8_t decimals) {
+  _type = static_cast<Internals::JsonVariantType>(
+      Internals::JSON_DOUBLE_0_DECIMALS + decimals);
+  _content.asDouble = value;
+}
+
+inline JsonVariant::JsonVariant(JsonArray &array) {
+  _type = Internals::JSON_ARRAY;
+  _content.asArray = &array;
+}
+
+inline JsonVariant::JsonVariant(JsonObject &object) {
+  _type = Internals::JSON_OBJECT;
+  _content.asObject = &object;
+}
+
+inline JsonVariant::JsonVariant(signed char value) {
+  _type = Internals::JSON_LONG;
+  _content.asLong = value;
+}
+
+inline JsonVariant::JsonVariant(signed int value) {
+  _type = Internals::JSON_LONG;
+  _content.asLong = value;
+}
+
+inline JsonVariant::JsonVariant(signed long value) {
+  _type = Internals::JSON_LONG;
+  _content.asLong = value;
+}
+
+inline JsonVariant::JsonVariant(signed short value) {
+  _type = Internals::JSON_LONG;
+  _content.asLong = value;
+}
+
+inline JsonVariant::JsonVariant(unsigned char value) {
+  _type = Internals::JSON_LONG;
+  _content.asLong = value;
+}
+
+inline JsonVariant::JsonVariant(unsigned int value) {
+  _type = Internals::JSON_LONG;
+  _content.asLong = value;
+}
+
+inline JsonVariant::JsonVariant(unsigned long value) {
+  _type = Internals::JSON_LONG;
+  _content.asLong = value;
+}
+
+inline JsonVariant::JsonVariant(unsigned short value) {
+  _type = Internals::JSON_LONG;
+  _content.asLong = value;
+}
+
+template <typename T>
+inline T JsonVariant::as() const {
+  return is<T>() ? _content.as<T>() : invalid<T>();
+}
+
+template <typename T>
+inline T JsonVariant::invalid() {
+  return T();
+}
+
+template <typename T>
+inline bool JsonVariant::is() const {
+  return false;
+}
+
+template <>
+inline bool JsonVariant::is<bool>() const {
+  return _type == Internals::JSON_BOOLEAN;
+}
+
+template <>
+inline bool JsonVariant::is<char const *>() const {
+  return _type == Internals::JSON_STRING;
+}
+
+template <>
+inline bool JsonVariant::is<double>() const {
+  return _type >= Internals::JSON_DOUBLE_0_DECIMALS;
+}
+
+template <>
+inline bool JsonVariant::is<float>() const {
+  return _type >= Internals::JSON_DOUBLE_0_DECIMALS;
+}
+
+template <>
+inline bool JsonVariant::is<JsonArray &>() const {
+  return _type == Internals::JSON_ARRAY;
+}
+
+template <>
+inline bool JsonVariant::is<JsonArray const &>() const {
+  return _type == Internals::JSON_ARRAY;
+}
+
+template <>
+inline bool JsonVariant::is<JsonObject &>() const {
+  return _type == Internals::JSON_OBJECT;
+}
+
+template <>
+inline bool JsonVariant::is<JsonObject const &>() const {
+  return _type == Internals::JSON_OBJECT;
+}
+
+template <>
+inline bool JsonVariant::is<signed char>() const {
+  return _type == Internals::JSON_LONG;
+}
+
+template <>
+inline bool JsonVariant::is<signed int>() const {
+  return _type == Internals::JSON_LONG;
+}
+
+template <>
+inline bool JsonVariant::is<signed long>() const {
+  return _type == Internals::JSON_LONG;
+}
+
+template <>
+inline bool JsonVariant::is<signed short>() const {
+  return _type == Internals::JSON_LONG;
+}
+
+template <>
+inline bool JsonVariant::is<unsigned char>() const {
+  return _type == Internals::JSON_LONG;
+}
+
+template <>
+inline bool JsonVariant::is<unsigned int>() const {
+  return _type == Internals::JSON_LONG;
+}
+
+template <>
+inline bool JsonVariant::is<unsigned long>() const {
+  return _type == Internals::JSON_LONG;
+}
+
+template <>
+inline bool JsonVariant::is<unsigned short>() const {
+  return _type == Internals::JSON_LONG;
+}
+}