Add helpers for invoking some of the VM instance methods

include/evmc/helpers.h

@@ -0,0 +1,54 @@
+/* EVMC: Ethereum Client-VM Connector API.
+ * Copyright 2018 Pawel Bylica.
+ * Licensed under the MIT License. See the LICENSE file.
+ */
+
+/**
+ * EVMC Helpers
+ *
+ * A collection of helper functions for invoking a VM instance methods.
+ * These are convenient for languages where invoking function pointers
+ * is "ugly" or impossible (such as Go).
+ *
+ * @defgroup helpers EVMC Helpers
+ * @{
+ */
+#pragma once
+
+#include <evmc/evmc.h>
+
+/**
+ * Destroys the VM instance.
+ *
+ * @see evmc_destroy_fn
+ */
+static inline void evmc_destroy(struct evmc_instance* instance)
+{
+    instance->destroy(instance);
+}
+
+/**
+ * Sets the option for the VM instance, if the feature is supported by the VM.
+ *
+ * @see evmc_set_option_fn
+ */
+static inline int evmc_set_option(struct evmc_instance* instance,
+                                  char const* name,
+                                  char const* value)
+{
+    if (instance->set_option)
+        return instance->set_option(instance, name, value);
+    return 0;
+}
+
+/**
+ * Releases the resources allocated to the execution result.
+ *
+ * @see evmc_release_result_fn
+ */
+static inline void evmc_release_result(struct evmc_result* result)
+{
+    result->release(result);
+}
+
+/** @} */