commit a959678ca810529e886adc40bcc4c8c59c0ee0e4
author Patrick Williams <patrick@stwcx.xyz> Fri Apr 15 10:20:07 2022 -0500
committer Patrick Williams <patrick@stwcx.xyz> Fri Apr 15 10:20:10 2022 -0500
tree 28e7904366c1506c7e2722ab874d62c90e51fde2
parent 03c4c8e263d1c756299e1f63398412b247c19760

expression: limit JSON value copy

Switch 'auto' to 'auto&' to minimize the unnecessary JSON object copy.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: If2f89f1b7a895051f1fc240d8199b721788509ec

virtualSensor.cpp

diff --git a/virtualSensor.cpp b/virtualSensor.cpp
index 5883d23..304e874 100644
--- a/virtualSensor.cpp
+++ b/virtualSensor.cpp
@@ -292,7 +292,7 @@
     static constexpr auto exprKey = "Expression";
     if (sensorConfig.contains(exprKey))
     {
-        auto ref = sensorConfig.at(exprKey);
+        auto& ref = sensorConfig.at(exprKey);
         if (ref.is_array())
         {
             exprStr = std::string{};