Rename `EvaluationContext::heatmapDensity` to `colorRampParameter`

More generic name as the same class member is to be used by the
linear gradient properties.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mbgl/style/expression/compound_expression.cpp b/src/mbgl/style/expression/compound_expression.cpp
index 53ce91f0b7..4c476a3749 100644
--- a/src/mbgl/style/expression/compound_expression.cpp
+++ b/src/mbgl/style/expression/compound_expression.cpp
@@ -343,12 +343,12 @@ std::unordered_map<std::string, CompoundExpressionRegistry::Definition> initiali
     });
 
     define("heatmap-density", [](const EvaluationContext& params) -> Result<double> {
-        if (!params.heatmapDensity) {
+        if (!params.colorRampParameter) {
             return EvaluationError {
                 "The 'heatmap-density' expression is unavailable in the current evaluation context."
             };
         }
-        return *(params.heatmapDensity);
+        return *(params.colorRampParameter);
     });
 
     define("has", [](const EvaluationContext& params, const std::string& key) -> Result<bool> {