From 95737d272152308327b287496298fafafd7acd86 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <chfast@gmail.com>
Date: Wed, 6 Nov 2019 13:06:58 +0100
Subject: [PATCH] cpp: Add default constructor for HostContext

---
 include/evmc/evmc.hpp       | 5 ++++-
 test/unittests/test_cpp.cpp | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/evmc/evmc.hpp b/include/evmc/evmc.hpp
index edc54f7..2e3af07 100644
--- a/include/evmc/evmc.hpp
+++ b/include/evmc/evmc.hpp
@@ -501,7 +501,10 @@ class HostContext : public HostInterface
     evmc_tx_context tx_context = {};
 
 public:
-    /// Implicit converting constructor from evmc_host_context.
+    /// Default constructor for null Host context.
+    HostContext() = default;
+
+    /// Constructor from the EVMC Host primitives.
     HostContext(const evmc_host_interface* interface, evmc_host_context* ctx) noexcept
       : host{interface}, context{ctx}
     {}
diff --git a/test/unittests/test_cpp.cpp b/test/unittests/test_cpp.cpp
index fd6260b..6637d25 100644
--- a/test/unittests/test_cpp.cpp
+++ b/test/unittests/test_cpp.cpp
@@ -404,9 +404,10 @@ TEST(cpp, host_call)
 {
     // Use example host to test Host::call() method.
 
+    auto host = evmc::HostContext{};  // Use default constructor.
     auto* host_interface = example_host_get_interface();
     auto* host_context = example_host_create_context(evmc_tx_context{});
-    auto host = evmc::HostContext{host_interface, host_context};
+    host = evmc::HostContext{host_interface, host_context};
 
     EXPECT_EQ(host.call({}).gas_left, 0);