1 files changed, 38 insertions, 0 deletions
diff --git a/src/boost/libs/local_function/example/add_global_functor.cpp b/src/boost/libs/local_function/example/add_global_functor.cpp
new file mode 100644
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+++ b/src/boost/libs/local_function/example/add_global_functor.cpp
@@ -0,0 +1,38 @@
+
+// Copyright (C) 2009-2012 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)
+// Home at http://www.boost.org/libs/local_function
+
+#include <boost/detail/lightweight_test.hpp>
+#include <algorithm>
+
+//[add_global_functor
+// Unfortunately, cannot be defined locally (so not a real alternative).
+struct global_add { // Unfortunately, boilerplate code to program the class.
+    global_add(int& _sum, int _factor): sum(_sum), factor(_factor) {}
+
+    inline void operator()(int num) { // Body uses C++ statement syntax.
+        sum += factor * num;
+    }
+
+private: // Unfortunately, cannot bind so repeat variable types.
+    int& sum; // Access `sum` by reference.
+    const int factor; // Make `factor` constant.
+};
+
+int main(void) {
+    int sum = 0, factor = 10;
+
+    global_add add(sum, factor);
+
+    add(1);
+    int nums[] = {2, 3};
+    std::for_each(nums, nums + 2, add); // Passed as template parameter.
+
+    BOOST_TEST(sum == 60);
+    return boost::report_errors();
+}
+//]
+