improved cuda error checking

src/cuda_error.cpp

@@ -0,0 +1,13 @@
+#include "cuda_error.h"
+
+#include "cuda_runtime.h"
+#include <iostream>
+
+
+void check_cuda(cudaError_t res, char const* const func, const char* const file, int const line) {
+  if (res) {
+    std::cout << "CUDA encountered an error: " << cudaGetErrorString(res) << " in " << file << ":" << line << std::endl;
+    cudaDeviceReset();
+    exit(1);
+  }
+}