More conversion fixes for gcc

Author: cdunn2001

include/json/writer.h

@@ -302,7 +302,7 @@ class JSON_API StyledStreamWriter {
   ChildValues childValues_;
   std::ostream* document_;
   std::string indentString_;
-  int rightMargin_;
+  unsigned int rightMargin_;
   std::string indentation_;
   bool addChildValues_ : 1;
   bool indented_ : 1;

src/lib_json/json_writer.cpp

@@ -524,7 +524,7 @@ bool StyledWriter::isMultineArray(const Value& value) {
         isMultiLine = true;
       }
       writeValue(value[index]);
-      lineLength += childValues_[index].length();
+      lineLength += static_cast<ArrayIndex>(childValues_[index].length());
     }
     addChildValues_ = false;
     isMultiLine = isMultiLine || lineLength >= rightMargin_;
@@ -743,7 +743,7 @@ bool StyledStreamWriter::isMultineArray(const Value& value) {
         isMultiLine = true;
       }
       writeValue(value[index]);
-      lineLength += childValues_[index].length();
+      lineLength += static_cast<ArrayIndex>(childValues_[index].length());
     }
     addChildValues_ = false;
     isMultiLine = isMultiLine || lineLength >= rightMargin_;
@@ -1026,7 +1026,7 @@ bool BuiltStyledStreamWriter::isMultineArray(Value const& value) {
         isMultiLine = true;
       }
       writeValue(value[index]);
-      lineLength += childValues_[index].length();
+      lineLength += static_cast<ArrayIndex>(childValues_[index].length());
     }
     addChildValues_ = false;
     isMultiLine = isMultiLine || lineLength >= rightMargin_;