From e5e09c1c041eee6aa0597a83a312c6f0e1f838c8 Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@gmail.com>
Date: Tue, 5 Mar 2019 01:14:09 +0200
Subject: [PATCH] Only use mp_invoke_q on mp11 1.70 and above

---
 include/boost/variant2/variant.hpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/boost/variant2/variant.hpp b/include/boost/variant2/variant.hpp
index 12e58ab..7ecc25f 100644
--- a/include/boost/variant2/variant.hpp
+++ b/include/boost/variant2/variant.hpp
@@ -224,8 +224,16 @@ template<std::size_t I, class... T> struct variant_alternative<I, variant<T...>
 namespace detail
 {
 
+#if defined( BOOST_MP11_VERSION ) && BOOST_MP11_VERSION >= 107000
+
 template<class I, class T, class Q> using var_alt_impl = mp11::mp_invoke_q<Q, variant_alternative_t<I::value, T>>;
 
+#else
+
+template<class I, class T, class Q> using var_alt_impl = mp11::mp_invoke<Q, variant_alternative_t<I::value, T>>;
+
+#endif
+
 } // namespace detail
 
 template<std::size_t I, class T> struct variant_alternative