1 files changed, 114 insertions, 0 deletions
diff --git a/src/boost/libs/outcome/test/tests/hooks.cpp b/src/boost/libs/outcome/test/tests/hooks.cpp
new file mode 100644
index 00000000..e5a7bca8
--- /dev/null
+++ b/src/boost/libs/outcome/test/tests/hooks.cpp
@@ -0,0 +1,114 @@
+/* Unit testing for outcomes
+(C) 2013-2019 Niall Douglas <http://www.nedproductions.biz/> (14 commits)
+
+
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+#define _CRT_SECURE_NO_WARNINGS
+
+#include <boost/outcome/outcome.hpp>
+#include <boost/test/unit_test.hpp>
+#include <boost/test/unit_test_monitor.hpp>
+
+#include <iostream>
+
+namespace hook_test
+{
+  using BOOST_OUTCOME_V2_NAMESPACE::in_place_type;
+  // Use static storage to convey extended error info from result construction to outcome conversion
+  static char extended_error_info[256];
+
+  // Use the error_code type as the ADL bridge for the hooks by creating a type here
+  struct error_code : public boost::system::error_code
+  {
+    using boost::system::error_code::error_code;
+    error_code() = default;
+    error_code(boost::system::error_code ec)  // NOLINT
+    : boost::system::error_code(ec)
+    {
+    }
+  };
+  // Localise result to using the local error_code so this namespace gets looked up for the hooks
+  template <class R> using result = BOOST_OUTCOME_V2_NAMESPACE::result<R, error_code>;
+  // Specialise the result construction hook for our localised result
+  template <class U> constexpr inline void hook_result_construction(result<int> *res, U && /*unused*/) noexcept
+  {
+    // Write the value in the result into the static storage
+    snprintf(extended_error_info, sizeof(extended_error_info), "%d", res->assume_value());  // NOLINT
+  }
+  template <class U> constexpr inline void hook_result_construction(result<std::string> *res, U && /*unused*/) noexcept
+  {
+    // Write the value in the result into the static storage
+    snprintf(extended_error_info, sizeof(extended_error_info), "%s", res->assume_value().c_str());  // NOLINT
+  }
+}  // namespace hook_test
+
+BOOST_OUTCOME_AUTO_TEST_CASE(works_result_hooks, "Tests that you can hook result's construction")
+{
+  using namespace hook_test;
+  result<int> a(5);
+  BOOST_CHECK(!strcmp(extended_error_info, "5"));  // NOLINT
+  result<std::string> b("niall");
+  BOOST_CHECK(!strcmp(extended_error_info, "niall"));  // NOLINT
+}
+
+//! [extended_error_coding2]
+namespace hook_test
+{
+  // Localise outcome to using the local error_code so this namespace gets looked up for the hooks
+  template <class R> using outcome = BOOST_OUTCOME_V2_NAMESPACE::outcome<R, error_code, std::string>;
+
+  // Specialise the outcome copy and move conversion hook for our localised result
+  template <class T, class U> constexpr inline void hook_outcome_copy_construction(outcome<T> *res, const result<U> & /*unused*/) noexcept
+  {
+    // when copy constructing from a result<T>, place extended_error_coding::extended_error_info into the payload
+    std::cout << "hook_outcome_copy_construction fires" << std::endl;
+    BOOST_OUTCOME_V2_NAMESPACE::hooks::override_outcome_exception(res, extended_error_info);
+  }
+  template <class T, class U> constexpr inline void hook_outcome_move_construction(outcome<T> *res, result<U> && /*unused*/) noexcept
+  {
+    // when move constructing from a result<T>, place extended_error_coding::extended_error_info into the payload
+    std::cout << "hook_outcome_move_construction fires" << std::endl;
+    BOOST_OUTCOME_V2_NAMESPACE::hooks::override_outcome_exception(res, extended_error_info);
+  }
+}  // namespace hook_test
+
+BOOST_OUTCOME_AUTO_TEST_CASE(works_outcome_hooks, "Tests that you can hook outcome's conversion from a result")
+{
+  using namespace hook_test;
+  outcome<int> a(result<int>(5));
+  BOOST_REQUIRE(a.has_exception());  // NOLINT
+  BOOST_CHECK(a.exception() == "5");
+  outcome<std::string> b(result<std::string>("niall"));
+  BOOST_CHECK(b.exception() == "niall");
+
+  // Make sure hook does not fire for any other kind of outcome copy or move, only when converting from our custom result only
+  outcome<int> c(5);
+  outcome<long> d(c);  // can't be the same type as source, else copy elision takes place and no ADL hook calling
+  BOOST_CHECK(!d.has_exception());
+  outcome<int> e(BOOST_OUTCOME_V2_NAMESPACE::result<int>(5));
+  BOOST_CHECK(!e.has_exception());
+}