ipa: libipa: vector: Add sum() function

Add a function to calculate the sum of a vector. It will be useful for
algorithms.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/ipa/libipa/vector.h b/src/ipa/libipa/vector.h
index 937a28e9..9bdd54b6 100644
--- a/src/ipa/libipa/vector.h
+++ b/src/ipa/libipa/vector.h
@@ -10,6 +10,7 @@
 #include <array>
 #include <cmath>
 #include <functional>
+#include <numeric>
 #include <optional>
 #include <ostream>
 
@@ -239,6 +240,12 @@ public:
 		return std::sqrt(length2());
 	}
 
+	template<typename R = T>
+	constexpr R sum() const
+	{
+		return std::accumulate(data_.begin(), data_.end(), R{});
+	}
+
 private:
 	template<class BinaryOp>
 	static constexpr Vector apply(const Vector &lhs, const Vector &rhs, BinaryOp op)