Add guard so code compiles in old compilers.

0f06d78e · Davis King · d635a7ee · 0f06d78e
Commit 0f06d78e authored Jul 22, 2016 by Davis King
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dlib/test/threads.cpp dlib/test/threads.cpp +2 -0

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--- a/dlib/test/threads.cpp
+++ b/dlib/test/threads.cpp
@@ -21,6 +21,7 @@ namespace

    void test_async()
    {
+#if __cplusplus >= 201103
        print_spinner();
        auto v1 = dlib::async([]() { dlib::sleep(500); return 1; }).share();
        auto v2 = dlib::async([v1]() { dlib::sleep(400); return v1.get()+1; }).share();
@@ -42,6 +43,7 @@ namespace
            DLIB_TEST(e.what() == string("oops"));
        }
        DLIB_TEST(got_exception);
+#endif
    }

    class threads_tester : public tester