Avoid heap allocations on the fast path for onces.

Capturing anything (including `this') is convenient, but
expensive due to the overhead of std::function<> objects.

Change-Id: Ibe8e91a1a09090d5abde1bb6d78d2617243045b9
Reviewed-on: https://code-review.googlesource.com/7532
Reviewed-by: Paul Wankadia <junyer@google.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/re2/re2.h b/re2/re2.h
index 377a04d..c49de05 100644
--- a/re2/re2.h
+++ b/re2/re2.h
@@ -905,7 +905,7 @@ class LazyRE2 {
 
   // Named accessor/initializer:
   RE2* get() const {
-    std::call_once(once_, [this]() { LazyRE2::Init(this); });
+    std::call_once(once_, &LazyRE2::Init, this);
     return ptr_;
   }