Merge pull request #49 from VCTLabs/json-support-double

json.hh: get/set for double floating point values

inc/json.hh

@@ -18,7 +18,7 @@ class json_missing_field : public std::runtime_error
 class json {
  public:
     // normally want to take reference on underlying json_object*,
-    // except for case of initializing from an exising raw json_object*
+    // except for case of initializing from an existing raw json_object*
     // such as those returned by redis_ipc -- those start out with a reference
     explicit json(bool is_array = false) {
         if (is_array) obj = json_object_new_array();
@@ -52,6 +52,11 @@ class json {
         return !is_same;
     }
 
+    std::string dump(void) const {
+        std::string repr = json_object_to_json_string_ext(obj, JSON_C_TO_STRING_PRETTY);
+        return repr;
+    }
+
     std::string to_string() const {
         std::string value;
         if (obj) value = json_object_get_string(obj);
@@ -60,6 +65,12 @@ class json {
         return value;
     }
 
+    double to_double() const {
+        int value = -1;
+        if (obj) value = json_object_get_double(obj);
+        return value;
+    }
+
     int to_int() const {
         int value = -1;
         if (obj) value = json_object_get_int(obj);
@@ -117,6 +128,13 @@ class json {
         json_object_object_add(obj, field_name, string_obj);
     }
 
+    void set_field(const char *field_name, const double &value) {
+        if (!json_object_is_type(obj, json_type_object))
+            throw std::runtime_error("Not a hash-type object!");
+        json_object *double_obj = json_object_new_double(value);
+        json_object_object_add(obj, field_name, double_obj);
+    }
+
     void set_field(const char *field_name, const int &value) {
         if (!json_object_is_type(obj, json_type_object))
             throw std::runtime_error("Not a hash-type object!");

test/json_test.cpp

@@ -16,8 +16,13 @@ int main(int argc, char **argv)
         json wooka = snook;
         cout << wooka.get_field("betook").get_field("baggins").to_string() << endl;
     }
+    snook.set_field("blueness", 1.5e9);
+    cout << "Display individual fields..." << endl;
     cout << snook.get_field("betook").get_field("baggins").to_string() << endl;
     cout << snook.get_field("betook").get_field("bilbo").to_string() << endl;
+    cout << snook.get_field("blueness").to_string() << endl;
+    cout << "Display whole thing..." << endl;
+    cout << snook.dump() << endl;
 
     if (snook.has_field("betook"))
         cout << "OK this field exists" << endl;

test/json_test.out

@@ -1,6 +1,16 @@
 9999
+Display individual fields...
 9999
 hungry
+1500000000.0
+Display whole thing...
+{
+  "betook":{
+    "baggins":9999,
+    "bilbo":"hungry"
+  },
+  "blueness":1500000000.0
+}
 OK this field exists
 OK this field does not exist
 OK these objects match