Merge #10193: scripted-diff: Remove #include <boost/foreach.hpp>

b1268a1 clang-format: Delete ForEachMacros (Jorge Timón)
5995735 scripted-diff: Remove #include <boost/foreach.hpp> (Jorge Timón)
3eff827 scripted-diff: Remove BOOST_REVERSE_FOREACH (Jorge Timón)
33aed5b Fix const_reverse_iterator constructor (pass const ptr) (Jorge Timón)
300851e Introduce src/reverse_iterator.hpp and include it... (Jorge Timón)

Tree-SHA512: df3405328e9602d0a433ac134ba59a5c9a6202ef64188df2f94a59b2ce58dec7c988b25d0671c7937de516a96b2e6daeb9d04c82fa363b616ee4cf6e9cb0fac6

1 files changed, 39 insertions, 0 deletions

diff --git a/src/reverse_iterator.h b/src/reverse_iterator.h
new file mode 100644
index 0000000000..409f895ce0
--- /dev/null
+++ b/src/reverse_iterator.h
@@ -0,0 +1,39 @@
+// Taken from https://gist.github.com/arvidsson/7231973
+
+#ifndef BITCOIN_REVERSE_ITERATOR_HPP
+#define BITCOIN_REVERSE_ITERATOR_HPP
+
+/**
+ * Template used for reverse iteration in C++11 range-based for loops.
+ * 
+ *   std::vector<int> v = {1, 2, 3, 4, 5};
+ *   for (auto x : reverse_iterate(v))
+ *       std::cout << x << " ";
+ */
+
+template <typename T>
+class reverse_range
+{
+    T &x;
+    
+public:
+    reverse_range(T &x) : x(x) {}
+    
+    auto begin() const -> decltype(this->x.rbegin())
+    {
+        return x.rbegin();
+    }
+    
+    auto end() const -> decltype(this->x.rend())
+    {
+        return x.rend();
+    }
+};
+ 
+template <typename T>
+reverse_range<T> reverse_iterate(T &x)
+{
+    return reverse_range<T>(x);
+}
+
+#endif // BITCOIN_REVERSE_ITERATOR_HPP