1 files changed, 65 insertions, 0 deletions
diff --git a/src/boost/libs/yap/test/placeholder_eval.cpp b/src/boost/libs/yap/test/placeholder_eval.cpp
new file mode 100644
index 000000000..76f9c378c
--- /dev/null
+++ b/src/boost/libs/yap/test/placeholder_eval.cpp
@@ -0,0 +1,65 @@
+// Copyright (C) 2016-2018 T. Zachary Laine
+//
+// 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)
+#include <boost/yap/expression.hpp>
+
+#include <boost/test/minimal.hpp>
+
+#include <sstream>
+
+
+template<typename T>
+using term = boost::yap::terminal<boost::yap::expression, T>;
+
+template<long long I>
+using place_term =
+    boost::yap::terminal<boost::yap::expression, boost::yap::placeholder<I>>;
+
+template<typename T>
+using ref = boost::yap::expression_ref<boost::yap::expression, T>;
+
+namespace yap = boost::yap;
+namespace bh = boost::hana;
+
+
+int test_main(int, char * [])
+{
+    {
+        using namespace boost::yap::literals;
+
+        place_term<3> p3 = 3_p;
+        int i_ = 42;
+        term<int> i{std::move(i_)};
+        yap::expression<
+            yap::expr_kind::plus,
+            bh::tuple<ref<place_term<3> &>, term<int>>>
+            expr = p3 + std::move(i);
+        yap::expression<
+            yap::expr_kind::plus,
+            bh::tuple<
+                ref<place_term<3> &>,
+                yap::expression<
+                    yap::expr_kind::plus,
+                    bh::tuple<ref<place_term<3> &>, term<int>>>>>
+            unevaluated_expr = p3 + std::move(expr);
+
+        {
+            double result = evaluate(p3, 5, 6, 7);
+            BOOST_CHECK(result == 7);
+        }
+
+        {
+            double result = evaluate(expr, std::string("15"), 3, 1);
+            BOOST_CHECK(result == 43);
+        }
+
+        {
+            double result = evaluate(unevaluated_expr, std::string("15"), 2, 3);
+            BOOST_CHECK(result == 48);
+        }
+    }
+
+    return 0;
+}