Add support for value lists to mp_pop_front. Refs #53.

include/boost/mp11/list.hpp

@@ -123,6 +123,15 @@ template<template<class...> class L, class T1, class... T> struct mp_pop_front_i
     using type = L<T...>;
 };
 
+#if defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
+
+template<template<auto...> class L, auto A1, auto... A> struct mp_pop_front_impl<L<A1, A...>>
+{
+    using type = L<A...>;
+};
+
+#endif
+
 } // namespace detail
 
 template<class L> using mp_pop_front = typename detail::mp_pop_front_impl<L>::type;

test/Jamfile

@@ -36,6 +36,7 @@ run mp_clear_2.cpp ;
 run mp_front.cpp ;
 run mp_front_2.cpp ;
 run mp_pop_front.cpp ;
+run mp_pop_front_2.cpp ;
 run mp_second.cpp ;
 run mp_third.cpp ;
 run mp_push_front.cpp ;

test/mp_pop_front_2.cpp

@@ -0,0 +1,37 @@
+// Copyright 2023 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/mp11/list.hpp>
+
+#if !defined(BOOST_MP11_HAS_TEMPLATE_AUTO)
+
+#pragma message("Test skipped because BOOST_MP11_HAS_TEMPLATE_AUTO is not defined")
+int main() {}
+
+#else
+
+#include <boost/core/lightweight_test_trait.hpp>
+
+template<auto... A> struct L1 {};
+template<int... I> struct L2 {};
+
+int main()
+{
+    using boost::mp11::mp_list_v;
+    using boost::mp11::mp_pop_front;
+    using boost::mp11::mp_rest;
+
+    BOOST_TEST_TRAIT_SAME(mp_pop_front<mp_list_v<false>>, mp_list_v<>);
+    BOOST_TEST_TRAIT_SAME(mp_rest<mp_list_v<false>>, mp_list_v<>);
+
+    BOOST_TEST_TRAIT_SAME(mp_pop_front<L1<-1, true>>, L1<true>);
+    BOOST_TEST_TRAIT_SAME(mp_rest<L1<-1, true>>, L1<true>);
+
+    BOOST_TEST_TRAIT_SAME(mp_pop_front<L2<0, 1, 2>>, L2<1, 2>);
+    BOOST_TEST_TRAIT_SAME(mp_rest<L2<0, 1, 2>>, L2<1, 2>);
+
+    return boost::report_errors();
+}
+
+#endif