Added a new method to Expression so it can be used with multiple threads simultenously.

core/math/expression.cpp

@@ -2209,6 +2209,33 @@ Variant Expression::execute(Array p_inputs, Object *p_base, bool p_show_error) {
 	return output;
 }
 
+Array Expression::execute_arr(Array p_inputs, Object *p_base, bool p_show_error) {
+	Array ret;
+	ret.resize(3);
+
+	ERR_FAIL_COND_V_MSG(error_set, ret, "There was previously a parse error: " + error_str + ".");
+
+	execution_error = false;
+	Variant output;
+	String error_txt;
+
+	bool err = _execute(p_inputs, p_base, root, output, error_txt);
+
+	ret[0] = output;
+
+	if (err) {
+		ret[1] = true;
+		ret[2] = error_txt;
+
+		ERR_FAIL_COND_V_MSG(p_show_error, ret, error_str);
+	} else {
+		ret[1] = false;
+		ret[2] = "";
+	}
+
+	return ret;
+}
+
 bool Expression::has_execute_failed() const {
 	return execution_error;
 }
@@ -2220,6 +2247,7 @@ String Expression::get_error_text() const {
 void Expression::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("parse", "expression", "input_names"), &Expression::parse, DEFVAL(Vector<String>()));
 	ClassDB::bind_method(D_METHOD("execute", "inputs", "base_instance", "show_error"), &Expression::execute, DEFVAL(Array()), DEFVAL(Variant()), DEFVAL(true));
+	ClassDB::bind_method(D_METHOD("execute_arr", "inputs", "base_instance", "show_error"), &Expression::execute_arr, DEFVAL(Array()), DEFVAL(Variant()), DEFVAL(true));
 	ClassDB::bind_method(D_METHOD("has_execute_failed"), &Expression::has_execute_failed);
 	ClassDB::bind_method(D_METHOD("get_error_text"), &Expression::get_error_text);
 }

core/math/expression.h

@@ -34,6 +34,8 @@
 
 #include "core/object/reference.h"
 
+#include "core/variant/array.h"
+
 class Expression : public Reference {
 	GDCLASS(Expression, Reference);
 
@@ -358,7 +360,10 @@ protected:
 
 public:
 	Error parse(const String &p_expression, const Vector<String> &p_input_names = Vector<String>());
+
 	Variant execute(Array p_inputs, Object *p_base = nullptr, bool p_show_error = true);
+	Array execute_arr(Array p_inputs, Object *p_base = nullptr, bool p_show_error = true);
+
 	bool has_execute_failed() const;
 	String get_error_text() const;
 

doc/classes/Expression.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="Expression" inherits="Reference" version="4.2">
+<class name="Expression" inherits="Reference" version="4.3">
 	<brief_description>
 		A class that stores an expression you can execute.
 	</brief_description>
@@ -36,6 +36,15 @@
 				If you defined input variables in [method parse], you can specify their values in the inputs array, in the same order.
 			</description>
 		</method>
+		<method name="execute_arr">
+			<return type="Array" />
+			<argument index="0" name="inputs" type="Array" default="[  ]" />
+			<argument index="1" name="base_instance" type="Object" default="null" />
+			<argument index="2" name="show_error" type="bool" default="true" />
+			<description>
+				Same as [method execute] except it does not set member variables. ret[0] is the result, ret[1] is a bool telling you whether execute was successful or not, ret[2] is a String contanining the error string if there was any.
+			</description>
+		</method>
 		<method name="get_error_text" qualifiers="const">
 			<return type="String" />
 			<description>