From 03c56bcc83c8984165208a3826fb06f68109d1ac Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Thu, 7 Aug 2025 13:39:54 +0200
Subject: Added subtraction

---
 modules/codec/c++/data_math.hpp | 11 +++++++++++
 modules/codec/tests/math.cpp    |  8 ++++++++
 2 files changed, 19 insertions(+)

(limited to 'modules/codec')

diff --git a/modules/codec/c++/data_math.hpp b/modules/codec/c++/data_math.hpp
index b5491eb..5791f00 100644
--- a/modules/codec/c++/data_math.hpp
+++ b/modules/codec/c++/data_math.hpp
@@ -104,6 +104,17 @@ public:
 
 		return c;
 	}
+
+	data<schema::Tensor<Inner, Dims...>, encode::Native> operator-(const data<schema::Tensor<Inner, Dims...>, encode::Native>& rhs) {
+		data<schema::Tensor<Inner, Dims...>, encode::Native> c;
+
+		rank_iterator<Dims...>::in_fixed_bounds([&](const data<schema::FixedArray<schema::UInt64, sizeof...(Dims)>, encode::Native>& index) -> error_or<void>{
+			c.at(index) = at(index) - rhs.at(index);
+			return make_void();
+		});
+
+		return c;
+	}
 };
 
 }
diff --git a/modules/codec/tests/math.cpp b/modules/codec/tests/math.cpp
index 8b3b6f9..ad2d9a6 100644
--- a/modules/codec/tests/math.cpp
+++ b/modules/codec/tests/math.cpp
@@ -46,5 +46,13 @@ SAW_TEST("Math/Tensor"){
 		SAW_EXPECT(c.at({{1u,0u}}).get() == 7.0, std::string{"Unexpected value at (1,0): "} + std::to_string(c.at({{1u,0u}}).get()));
 		SAW_EXPECT(c.at({{1u,1u}}).get() == 9.0, std::string{"Unexpected value at (1,1): "} + std::to_string(c.at({{1u,1u}}).get()));
 	}
+
+	auto d = b - a;
+	{
+		SAW_EXPECT(d.at({{0u,0u}}).get() == 1.0, std::string{"Unexpected value at (0,0): "} + std::to_string(d.at({{0u,0u}}).get()) );
+		SAW_EXPECT(d.at({{0u,1u}}).get() == 1.0, std::string{"Unexpected value at (0,1): "} + std::to_string(d.at({{0u,1u}}).get()));
+		SAW_EXPECT(d.at({{1u,0u}}).get() == 1.0, std::string{"Unexpected value at (1,0): "} + std::to_string(d.at({{1u,0u}}).get()));
+		SAW_EXPECT(d.at({{1u,1u}}).get() == 1.0, std::string{"Unexpected value at (1,1): "} + std::to_string(d.at({{1u,1u}}).get()));
+	}
 }
 }
-- 
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