Adding upstream version 18.2.2.upstream/18.2.2

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

1 files changed, 43 insertions, 0 deletions

diff --git a/src/boost/libs/contract/example/features/lambda.cpp b/src/boost/libs/contract/example/features/lambda.cpp
new file mode 100644
index 000000000..6eb999801
--- /dev/null
+++ b/src/boost/libs/contract/example/features/lambda.cpp
@@ -0,0 +1,43 @@
+
+// Copyright (C) 2008-2018 Lorenzo Caminiti
+// Distributed under the Boost Software License, Version 1.0 (see accompanying
+// file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
+// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
+
+#include <boost/contract.hpp>
+#include <vector>
+#include <algorithm>
+#include <limits>
+
+int main() {
+    std::vector<int> v;
+    v.push_back(1);
+    v.push_back(2);
+    v.push_back(3);
+
+    //[lambda
+    int total = 0;
+    std::for_each(v.cbegin(), v.cend(),
+        // Contract for a lambda function.
+        [&total] (int const x) {
+            boost::contract::old_ptr<int> old_total =
+                    BOOST_CONTRACT_OLDOF(total);
+            boost::contract::check c = boost::contract::function()
+                .precondition([&] {
+                    BOOST_CONTRACT_ASSERT(
+                            total < std::numeric_limits<int>::max() - x);
+                })
+                .postcondition([&] {
+                    BOOST_CONTRACT_ASSERT(total == *old_total + x);
+                })
+            ;
+
+            total += x; // Lambda function body.
+        }
+    );
+    //]
+
+    assert(total == 6);
+    return 0;
+}
+