Test mp_fold and mp_reverse_fold with std::pair. Refs #108.

Author: pdimov

test/mp_fold.cpp

@@ -1,18 +1,14 @@
-
-//  Copyright 2015 Peter Dimov.
-//
+// Copyright 2015-2025 Peter Dimov.
 // Distributed under the Boost Software License, Version 1.0.
-//
-// See accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt
-
+// 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/core/lightweight_test_trait.hpp>
 #include <type_traits>
 #include <tuple>
+#include <utility>
 
 struct X1 {};
 struct X2 {};
@@ -69,6 +65,10 @@ int main()
         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::tuple<X1, X2, X3, X4>, void, F>, F<F<F<F<void, X1>, X2>, X3>, X4>>));
     }
 
+    {
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold<std::pair<X1, X2>, void, F>, F<F<void, X1>, X2>>));
+    }
+
     using boost::mp11::mp_push_back;
 
     {

test/mp_fold_q.cpp

@@ -1,11 +1,6 @@
-
-// Copyright 2015, 2017 Peter Dimov.
-//
+// Copyright 2015-2025 Peter Dimov.
 // Distributed under the Boost Software License, Version 1.0.
-//
-// See accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt
-
+// https://www.boost.org/LICENSE_1_0.txt
 
 #include <boost/mp11/algorithm.hpp>
 #include <boost/mp11/list.hpp>
@@ -14,6 +9,7 @@
 #include <boost/core/lightweight_test_trait.hpp>
 #include <type_traits>
 #include <tuple>
+#include <utility>
 
 struct X1 {};
 struct X2 {};
@@ -46,6 +42,10 @@ int main()
         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold_q<std::tuple<X1, X2, X3, X4>, void, Q>, F<F<F<F<void, X1>, X2>, X3>, X4>>));
     }
 
+    {
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_fold_q<std::pair<X1, X2>, void, Q>, F<F<void, X1>, X2>>));
+    }
+
     using boost::mp11::mp_push_back;
 
     {

test/mp_reverse_fold.cpp

@@ -1,18 +1,14 @@
-
-// Copyright 2015-2017 Peter Dimov.
-//
+// Copyright 2015-2025 Peter Dimov.
 // Distributed under the Boost Software License, Version 1.0.
-//
-// See accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt
-
+// 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/core/lightweight_test_trait.hpp>
 #include <type_traits>
 #include <tuple>
+#include <utility>
 
 struct X1 {};
 struct X2 {};
@@ -50,6 +46,10 @@ int main()
         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<X1, X2, X3, X4>, void, F>, F<X1, F<X2, F<X3, F<X4, void>>>>>));
     }
 
+    {
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::pair<X1, X2>, void, F>, F<X1, F<X2, void>>>));
+    }
+
     {
         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold<std::tuple<X1, X2, X3, X4>, mp_list<>, rev_push_back>, mp_list<X4, X3, X2, X1>>));
     }

test/mp_reverse_fold_q.cpp

@@ -1,11 +1,6 @@
-
-// Copyright 2015-2017 Peter Dimov.
-//
+// Copyright 2015-2017, 2025 Peter Dimov.
 // Distributed under the Boost Software License, Version 1.0.
-//
-// See accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt
-
+// https://www.boost.org/LICENSE_1_0.txt
 
 #include <boost/mp11/algorithm.hpp>
 #include <boost/mp11/list.hpp>
@@ -14,6 +9,7 @@
 #include <boost/core/lightweight_test_trait.hpp>
 #include <type_traits>
 #include <tuple>
+#include <utility>
 
 struct X1 {};
 struct X2 {};
@@ -46,6 +42,10 @@ int main()
         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold_q<std::tuple<X1, X2, X3, X4>, void, Q>, F<X1, F<X2, F<X3, F<X4, void>>>>>));
     }
 
+    {
+        BOOST_TEST_TRAIT_TRUE((std::is_same<mp_reverse_fold_q<std::pair<X1, X2>, void, Q>, F<X1, F<X2, void>>>));
+    }
+
     using boost::mp11::mp_bind;
     using boost::mp11::_1;
     using boost::mp11::_2;