catch by const reference

stan-dev · Jan 11, 2020 · 98a8cad · 98a8cad
1 parent dbce270
commit 98a8cad
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/stan/math/prim/core/init_threadpool_tbb.hpp b/stan/math/prim/core/init_threadpool_tbb.hpp
@@ -47,7 +47,7 @@ inline int get_num_threads() {
                          "The STAN_NUM_THREADS environment variable is '",
                          "' but it must be positive or -1");
       }
-    } catch (boost::bad_lexical_cast) {
+    } catch (const boost::bad_lexical_cast&) {
       invalid_argument("get_num_threads(int)", "STAN_NUM_THREADS",
                        env_stan_num_threads,
                        "The STAN_NUM_THREADS environment variable is '",