Added check for vector dimensions to cpp proximal decoder

sw/cpp/src/cpp_decoders.cpp

@@ -1,14 +1,13 @@
 #include <Eigen/Dense>
+#include <bit>
 #include <iostream>
+#include <stdexcept>
 
+#include <pybind11/eigen.h>
 #include <pybind11/numpy.h>
 #include <pybind11/pybind11.h>
 #include <pybind11/stl.h>
 
-#include <pybind11/eigen.h>
-
-#include <bit>
-
 
 namespace py11 = pybind11;
 using namespace pybind11::literals;
@@ -33,6 +32,9 @@ public:
 
     std::pair<std::optional<Eigen::RowVectorXi>, int>
     decode(const Eigen::Ref<const Eigen::VectorXd>& y) {
+        if (y.size() != mH.cols())
+            throw std::runtime_error("Length of vector must match H matrix");
+
         Eigen::RowVectorXd s = Eigen::RowVectorXd::Zero(mH.cols());
         Eigen::RowVectorXi x_hat;
         Eigen::RowVectorXd r;
@@ -129,4 +131,6 @@ PYBIND11_MODULE(cpp_decoders, proximal) {
                                        t[2].cast<double>(), t[3].cast<double>(),
                                        t[4].cast<double>()};
             }));
+
+    pybind11::register_exception<std::runtime_error>(proximal, "CppException");
 }