Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/src/boost/libs/yap/example/calc2a.cpp b/src/boost/libs/yap/example/calc2a.cpp
new file mode 100644
index 00000000..8d28e5bf
--- /dev/null
+++ b/src/boost/libs/yap/example/calc2a.cpp
@@ -0,0 +1,45 @@
+// 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)
+//[ calc2a
+#include <boost/yap/expression.hpp>
+
+#include <iostream>
+
+
+int main ()
+{
+    using namespace boost::yap::literals;
+
+    auto expr_1 = 1_p + 2.0;
+
+    auto expr_1_fn = [expr_1](auto &&... args) {
+        return evaluate(expr_1, args...);
+    };
+
+    auto expr_2 = 1_p * 2_p;
+
+    auto expr_2_fn = [expr_2](auto &&... args) {
+        return evaluate(expr_2, args...);
+    };
+
+    auto expr_3 = (1_p - 2_p) / 2_p;
+
+    auto expr_3_fn = [expr_3](auto &&... args) {
+        return evaluate(expr_3, args...);
+    };
+
+    // Displays "5"
+    std::cout << expr_1_fn(3.0) << std::endl;
+
+    // Displays "6"
+    std::cout << expr_2_fn(3.0, 2.0) << std::endl;
+
+    // Displays "0.5"
+    std::cout << expr_3_fn(3.0, 2.0) << std::endl;
+
+    return 0;
+}
+//]