Add helper for iterating over a range defined by a pair of iterators

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/collections.hpp b/lib/collections.hpp
index 2b83500..59cec6f 100644
--- a/lib/collections.hpp
+++ b/lib/collections.hpp
@@ -117,3 +117,18 @@ materializeRange(const std::pair<In, In> & in)
 {
 	return Rtn(in.first, in.second);
 }
+
+template<typename T> struct pair_range {
+	constexpr auto &
+	begin() const noexcept
+	{
+		return pair.first;
+	}
+	constexpr auto &
+	end() const noexcept
+	{
+		return pair.second;
+	}
+	const std::pair<T, T> & pair;
+};
+template<typename T> pair_range(std::pair<T, T>) -> pair_range<T>;