add error print output for dml status code

test-project/error.hpp

@@ -0,0 +1,26 @@
+#include <dml/dml.hpp>
+#include <iostream>
+
+inline std::ostream& operator<<(std::ostream& strm, const dml::status_code code) {
+    switch(code) {
+        case dml::status_code::ok: strm << "[ok]"; break;
+        case dml::status_code::false_predicate: strm << "[false predicate]"; break;
+        case dml::status_code::partial_completion: strm << "[partial completion]"; break;
+        case dml::status_code::nullptr_error: strm << "[nullptr error]"; break;
+        case dml::status_code::bad_size: strm << "[bad size]"; break;
+        case dml::status_code::bad_length: strm << "[bad length]"; break;
+        case dml::status_code::inconsistent_size: strm << "[inconsistent size]"; break;
+        case dml::status_code::dualcast_bad_padding: strm << "[dualcast bad padding]"; break;
+        case dml::status_code::bad_alignment: strm << "[bad alignment]"; break;
+        case dml::status_code::buffers_overlapping: strm << "[buffers overlapping]"; break;
+        case dml::status_code::delta_delta_empty: strm << "[delta delta empty]"; break;
+        case dml::status_code::batch_overflow: strm << "[batch overflow]"; break;
+        case dml::status_code::execution_failed: strm << "[execution failed]"; break;
+        case dml::status_code::unsupported_operation: strm << "[unsupported operation]"; break;
+        case dml::status_code::queue_busy: strm << "[queue busy]"; break;
+        case dml::status_code::error: strm << "[unknown error]"; break;
+        case dml::status_code::config_error: strm << "[config error]"; break;
+        default: strm << "[unhandled error]"; break;
+    }
+    return strm;
+}

test-project/main.cpp

@@ -1,8 +1,11 @@
 #include <dml/dml.hpp>
+
 #include <numeric>
 #include <vector>
 #include <iostream>
 
+#include "error.hpp"
+
 constexpr auto size = 1024u;
 
 template <typename path>
@@ -23,7 +26,7 @@ int execute_mem_move() {
         std::cout << "Finished successfully." << std::endl;
     }
     else {
-        std::cout << "Failure occurred." << std::endl;
+        std::cout << "Failure occurred: " << result.status << std::endl;
         return -1;
     }