Add `createLiteral` convenience method

3 files changed, 16 insertions, 2 deletions

diff --git a/include/mbgl/style/expression/literal.hpp b/include/mbgl/style/expression/literal.hpp
index a00c468efc..d3b3a20cce 100644
--- a/include/mbgl/style/expression/literal.hpp
+++ b/include/mbgl/style/expression/literal.hpp
@@ -51,6 +51,9 @@ private:
     Value value;
 };
 
+std::unique_ptr<Literal> createLiteral(const char* value);
+std::unique_ptr<Literal> createLiteral(Value value);
+
 } // namespace expression
 } // namespace style
 } // namespace mbgl
diff --git a/src/mbgl/style/expression/literal.cpp b/src/mbgl/style/expression/literal.cpp
index 8a63980dba..f68cfd5cf5 100644
--- a/src/mbgl/style/expression/literal.cpp
+++ b/src/mbgl/style/expression/literal.cpp
@@ -109,6 +109,14 @@ mbgl::Value Literal::serialize() const {
         return *fromExpressionValue<mbgl::Value>(value);
     }
 }
+    
+std::unique_ptr<Literal> createLiteral(const char* value) {
+    return createLiteral(std::string(value));
+}
+
+std::unique_ptr<Literal> createLiteral(Value value) {
+    return std::make_unique<Literal>(value);
+}
 
 } // namespace expression
 } // namespace style
diff --git a/test/style/conversion/stringify.test.cpp b/test/style/conversion/stringify.test.cpp
index 851301d515..c3faf1f838 100644
--- a/test/style/conversion/stringify.test.cpp
+++ b/test/style/conversion/stringify.test.cpp
@@ -1,5 +1,6 @@
 #include <mbgl/test/util.hpp>
 
+#include <mbgl/style/expression/literal.hpp>
 #include <mbgl/style/conversion/stringify.hpp>
 #include <mbgl/style/types.hpp>
 #include <mbgl/style/layers/symbol_layer_properties.hpp>
@@ -75,10 +76,12 @@ TEST(Stringify, Value) {
 }
 
 TEST(Stringify, Filter) {
+    using namespace mbgl::style::expression;
+    
     ASSERT_EQ(stringify(Filter()), "null");
     
-    expression::ParsingContext context;
-    ASSERT_EQ(stringify(Filter(expression::createCompoundExpression("filter-==", std::make_unique<expression::Literal>(std::string("a")), std::make_unique<expression::Literal>(1.0), context))), "[\"filter-==\",\"a\",1.0]");
+    ParsingContext context;
+    ASSERT_EQ(stringify(Filter(createCompoundExpression("filter-==", createLiteral("a"), createLiteral(1.0), context))), "[\"filter-==\",\"a\",1.0]");
 }
 
 TEST(Stringify, CameraFunction) {