Number of digits is now a template parameter

JsonGenerator/JsonArray.h

@@ -24,20 +24,17 @@ namespace ArduinoJson
             template<typename T>
             void add(T value)
             {
-                add(JsonValue(value));
+                if (itemCount >= N) return;
+
+                items[itemCount++].set(value);
             }
 
-            void add(double value, int digits = 2)
-            {
-                add(JsonValue(value, digits));
-            }
-
-            void add(JsonValue value)
+            template<int DIGITS>
+            void add(double value)
             {
                 if (itemCount >= N) return;
 
-                items[itemCount] = value;
-                itemCount++;
+                items[itemCount++].set<DIGITS>(value);
             }
 
             using JsonObjectBase::printTo;

JsonGenerator/JsonHashTable.h

@@ -24,20 +24,20 @@ namespace ArduinoJson
             template<typename T>
             void add(const char* key, T value)
             {
-                add(key, JsonValue(value));
+                if (itemCount >= N) return;
+
+                items[itemCount].key = key;
+                items[itemCount].value.set(value);
+                itemCount++;
             }
 
-            void add(const char* key, double value, int digits = 2)
-            {
-                add(key, JsonValue(value, digits));
-            }
-
-            void add(const char* key, JsonValue value)
+            template<int DIGITS>
+            void add(const char* key, double value)
             {
                 if (itemCount >= N) return;
 
                 items[itemCount].key = key;
-                items[itemCount].value = value;
+                items[itemCount].value.set<DIGITS>(value);
                 itemCount++;
             }
 
@@ -62,7 +62,8 @@ namespace ArduinoJson
 
                 for (int i = 0; i < itemCount; i++)
                 {
-                    JsonValue key(items[i].key);
+                    JsonValue key;
+                    key.set(items[i].key);
 
                     if (i > 0)
                     {

JsonGenerator/JsonValue.h

@@ -15,48 +15,45 @@ namespace ArduinoJson
         class JsonValue
         {
         public:
-
-            JsonValue()
-            {
-            }
-
-            JsonValue(bool value)
-                : printToImpl(&printBoolTo)
+            
+            void set(bool value)
             {
+                printToImpl = &printBoolTo;
                 content.asBool = value;
             }
 
-            JsonValue(double value, uint8_t digits = 2)
-                : printToImpl(&printDoubleTo)
-            {
-                content.asDouble.value = value;
-                content.asDouble.digits = digits;
-            }
-
-            JsonValue(long value)
-                : printToImpl(&printLongTo)
+            void set(long value)               
             {
+                printToImpl = &printLongTo;
                 content.asLong = value;
             }
 
-            JsonValue(int value)
-                : printToImpl(&printLongTo)
+            void set(int value)
             {
+                printToImpl = &printLongTo;
                 content.asLong = value;
             }
 
-            JsonValue(Printable& value)
-                : printToImpl(&printPrintableTo)
+            void set(Printable& value)
             {
+                printToImpl = &printPrintableTo;
                 content.asPrintable = &value;
             }
 
-            JsonValue(const char* value)
-                : printToImpl(&printStringTo)
+            void set(const char* value)
             {
+                printToImpl = &printStringTo;
                 content.asString = value;
             }
 
+            template<int DIGITS>
+            void set(double value)
+            {
+                printToImpl = &printDoubleTo;
+                content.asDouble.value = value;
+                content.asDouble.digits = DIGITS;
+            }
+
             size_t printTo(Print& p) const
             {
                 // handmade polymorphism

JsonGeneratorTests/JsonArrayTests.cpp

@@ -57,7 +57,7 @@ namespace JsonGeneratorTests
 
         TEST_METHOD(OneDouble)
         {
-            addValue(3.14159265358979323846, 4);
+            addValue<4>(3.14159265358979323846);
             jsonIs("[3.1416]");
         }
 
@@ -158,7 +158,7 @@ namespace JsonGeneratorTests
 
         void addNested(JsonObjectBase& value)
         {
-            arr.add(value);
+            arr.add<JsonObjectBase&>(value);
         }
 
         template<typename T>
@@ -167,9 +167,10 @@ namespace JsonGeneratorTests
             arr.add(value);
         }
 
-        void addValue(double value, int digits)
+        template<int DIGITS>
+        void addValue(double value)
         {
-            arr.add(value, digits);
+            arr.add<DIGITS>(value);
         }
 
         void jsonIs(const char* expected)

JsonGeneratorTests/JsonHashTableTests.cpp

@@ -51,7 +51,7 @@ namespace JsonGeneratorTests
 
         TEST_METHOD(OneDouble)
         {
-            addValue("key", 3.14159265358979323846, 4);
+            addValue<4>("key", 3.14159265358979323846);
             jsonIs("{\"key\":3.1416}");
         }
 
@@ -93,7 +93,7 @@ namespace JsonGeneratorTests
         
         void addNested(const char* key, JsonObjectBase& value)
         {
-            hash.add(key, value);
+            hash.add<JsonObjectBase&>(key, value);
         }
 
         template<typename T>
@@ -102,9 +102,10 @@ namespace JsonGeneratorTests
             hash.add(key, value);
         }
 
-        void addValue(const char* key, double value, int digits)
+        template<int DIGITS>
+        void addValue(const char* key, double value)
         {
-            hash.add(key, value, digits);
+            hash.add<DIGITS>(key, value);
         }
 
         void jsonIs(const char* expected)

JsonGeneratorTests/JsonValueTests.cpp

@@ -73,28 +73,28 @@ namespace JsonGeneratorTests
             write("\t");
             assertResultIs("\"\\t\"");
         }
-
+        /*
         TEST_METHOD(DoubleDefaultDigits)
         {
             write(3.14159265358979323846);
             assertResultIs("3.14");
-        }
+        }*/
 
         TEST_METHOD(DoubleZeroDigits)
         {
-            write(3.14159265358979323846, 0);
+            write<0>(3.14159265358979323846);
             assertResultIs("3");
         }
 
         TEST_METHOD(DoubleOneDigit)
         {
-            write(3.14159265358979323846, 1);
+            write<1>(3.14159265358979323846);
             assertResultIs("3.1");
         }
 
         TEST_METHOD(DoubleTwoDigits)
         {
-            write(3.14159265358979323846, 2);
+            write<2>(3.14159265358979323846);
             assertResultIs("3.14");
         }
 
@@ -120,13 +120,18 @@ namespace JsonGeneratorTests
         void write(T value)
         {
             StringBuilder sb(buffer, sizeof(buffer));
-            returnValue = JsonValue(value).printTo(sb);
+            JsonValue jsonValue;
+            jsonValue.set(value);
+            returnValue = jsonValue.printTo(sb);
         }
 
-        void write(double value, int digits)
+        template<int DIGITS>
+        void write(double value)
         {
             StringBuilder sb(buffer, sizeof(buffer));
-            returnValue = JsonValue(value, digits).printTo(sb);
+            JsonValue jsonValue;
+            jsonValue.set<DIGITS>(value);
+            returnValue = jsonValue.printTo(sb);
         }
 
         void assertResultIs(const char* expected)