Add test/mp_repeat_3.cpp

include/boost/mp11/detail/mp_plus.hpp

@@ -20,7 +20,10 @@ namespace mp11
 namespace detail
 {
 
-#if defined( BOOST_MP11_HAS_FOLD_EXPRESSIONS ) && !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, < 1920 )
+#if defined( BOOST_MP11_HAS_FOLD_EXPRESSIONS ) && !BOOST_MP11_WORKAROUND( BOOST_MP11_MSVC, != 0 ) && !BOOST_MP11_WORKAROUND( BOOST_MP11_CLANG, != 0 )
+
+// msvc fails with parser stack overflow for large sizeof...(T)
+// clang exceeds -fbracket-depth, which defaults to 256
 
 template<class... T> struct mp_plus_impl
 {

test/Jamfile

@@ -86,6 +86,7 @@ run mp_starts_with.cpp ;
 run mp_starts_with_sf.cpp ;
 run mp_repeat.cpp ;
 run mp_repeat_2.cpp ;
+run mp_repeat_3.cpp ;
 run mp_product.cpp ;
 run mp_drop.cpp ;
 run mp_iota.cpp ;

test/mp_repeat_3.cpp

@@ -0,0 +1,42 @@
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/mp11/algorithm.hpp>
+#include <boost/mp11/list.hpp>
+#include <boost/mp11/integral.hpp>
+#include <boost/mp11/function.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+int main()
+{
+    using boost::mp11::mp_repeat_c;
+    using boost::mp11::mp_list;
+    using boost::mp11::mp_int;
+    using boost::mp11::mp_plus;
+    using boost::mp11::mp_apply;
+
+    int const N = 529;
+
+    {
+        using L1 = mp_repeat_c< mp_list<mp_int<1>, mp_int<2>>, N >;
+        using R1 = mp_apply<mp_plus, L1>;
+
+        BOOST_TEST_EQ( R1::value, N * 3 );
+    }
+
+#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
+
+    using boost::mp11::mp_list_v;
+
+    {
+        using L1 = mp_repeat_c< mp_list_v<1, 2>, N >;
+        using R1 = mp_apply<mp_plus, L1>;
+
+        BOOST_TEST_EQ( R1::value, N * 3 );
+    }
+
+#endif
+
+    return boost::report_errors();
+}