Avoid an unnecessary string copy

mgreter · mgreter · commit 2bd96ac8d6f9 · 2017-02-24T22:17:42.000+01:00
diff --git a/src/expand.cpp b/src/expand.cpp
@@ -264,7 +264,7 @@ namespace Sass {
   Statement_Ptr Expand::operator()(Assignment_Ptr a)
   {
     Env* env = environment();
-    std::string var(a->variable());
+    const std::string& var(a->variable());
     if (a->is_global()) {
       if (a->is_default()) {
         if (env->has_global(var)) {

Original file line number	Diff line number	Diff line change
`@@ -264,7 +264,7 @@ namespace Sass {`
`264`	`264`	`Statement_Ptr Expand::operator()(Assignment_Ptr a)`
`265`	`265`	`{`
`266`	`266`	`Env* env = environment();`
`267`		`- std::string var(a->variable());`
	`267`	`+ const std::string& var(a->variable());`
`268`	`268`	`if (a->is_global()) {`
`269`	`269`	`if (a->is_default()) {`
`270`	`270`	`if (env->has_global(var)) {`