1 files changed, 40 insertions, 0 deletions
diff --git a/src/boost/libs/contract/example/features/loop.cpp b/src/boost/libs/contract/example/features/loop.cpp
new file mode 100644
index 00000000..1d8acdd7
--- /dev/null
+++ b/src/boost/libs/contract/example/features/loop.cpp
@@ -0,0 +1,40 @@
+
+// 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);
+
+    //[loop
+    int total = 0;
+    // Contract for a for-loop (same for while- and all other loops).
+    for(std::vector<int>::const_iterator i = v.begin(); i != v.end(); ++i) {
+        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() - *i);
+            })
+            .postcondition([&] {
+                BOOST_CONTRACT_ASSERT(total == *old_total + *i);
+            })
+        ;
+
+        total += *i; // For-loop body.
+    }
+    //]
+
+    assert(total == 6);
+    return 0;
+}
+