Create header for example_host

examples/example_host/example_host.cpp

@@ -5,7 +5,8 @@
 /// @file
 /// Example implementation of an EVMC Host.
 
-#include <evmc/evmc.h>
+#include "example_host.h"
+
 #include <evmc/helpers.h>
 
 static evmc_uint256be balance(evmc_context* context, const evmc_address* address)
@@ -138,6 +139,8 @@ struct example_host_context : evmc_context
     example_host_context() : evmc_context{&methods} {}
 };
 
+extern "C" {
+
 evmc_context* example_host_create_context()
 {
     return new example_host_context;
@@ -146,4 +149,5 @@ evmc_context* example_host_create_context()
 void example_host_destroy_context(evmc_context* context)
 {
     delete context;
-}
+}
+}

examples/example_host/example_host.h

@@ -0,0 +1,18 @@
+/* EVMC: Ethereum Client-VM Connector API.
+ * Copyright 2018 The EVMC Authors.
+ * Licensed under the Apache License, Version 2.0. See the LICENSE file.
+ */
+
+#include <evmc/evmc.h>
+
+#if __cplusplus
+extern "C" {
+#endif
+
+struct evmc_context* example_host_create_context();
+
+void example_host_destroy_context(struct evmc_context* context);
+
+#if __cplusplus
+}
+#endif

test/vmtester/tests.cpp

@@ -1,7 +1,8 @@
-// EVMC -- Ethereum Client-VM Connector API
+// EVMC: Ethereum Client-VM Connector API
 // Copyright 2018 The EVMC Authors.
 // Licensed under the Apache License, Version 2.0. See the LICENSE file.
 
+#include "../../examples/example_host/example_host.h"
 #include "vmtester.hpp"
 
 #include <evmc/helpers.h>
@@ -9,12 +10,6 @@
 #include <array>
 #include <cstring>
 
-// Declarations of functions from example host:
-
-evmc_context* example_host_create_context();
-void example_host_destroy_context(evmc_context* context);
-
-
 // Compile time checks:
 
 static_assert(sizeof(evmc_uint256be) == 32, "evmc_uint256be is too big");