Sync public subset from Flux

include/utils/matcast.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include "./core/omp_config.h"
+#include "./utils/matrix.h"
+
+
+namespace utils{
+
+    template <typename To, typename From>
+    void inplace_matcast(const utils::Matrix<From>& A, utils::Matrix<To>& B) {
+        if ((A.rows() != B.rows()) || (A.cols() != B.cols())){
+            throw std::runtime_error("inplace_matcast: dimension mismatch");
+        }
+        const uint64_t rows = A.rows();
+        const uint64_t cols = A.cols();
+
+        for (uint64_t i = 0; i < rows; ++i){
+            for (uint64_t j = 0; j < cols; ++j){
+                B(i,j) = static_cast<To>(A(i,j));
+            }
+        }
+    }
+
+
+    template <typename To, typename From>
+    utils::Matrix<To> matcast(const utils::Matrix<From>& A) {
+        utils::Matrix<To> B(A.rows(), A.cols(), To{0});
+
+        inplace_matcast(A,B);
+
+        return B;
+    }
+
+} // end namespace utils
+