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libs/Catch2/include/internal/benchmark/detail/catch_complete_invoke.hpp

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+/*
+ *  Created by Joachim on 16/04/2019.
+ *  Adapted from donated nonius code.
+ *
+ *  Distributed under the Boost Software License, Version 1.0. (See accompanying
+ *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+// Invoke with a special case for void
+
+#ifndef TWOBLUECUBES_CATCH_DETAIL_COMPLETE_INVOKE_HPP_INCLUDED
+#define TWOBLUECUBES_CATCH_DETAIL_COMPLETE_INVOKE_HPP_INCLUDED
+
+#include "../../catch_enforce.h"
+#include "../../catch_meta.hpp"
+
+#include <type_traits>
+#include <utility>
+
+namespace Catch {
+    namespace Benchmark {
+        namespace Detail {
+            template <typename T>
+            struct CompleteType { using type = T; };
+            template <>
+            struct CompleteType<void> { struct type {}; };
+
+            template <typename T>
+            using CompleteType_t = typename CompleteType<T>::type;
+
+            template <typename Result>
+            struct CompleteInvoker {
+                template <typename Fun, typename... Args>
+                static Result invoke(Fun&& fun, Args&&... args) {
+                    return std::forward<Fun>(fun)(std::forward<Args>(args)...);
+                }
+            };
+            template <>
+            struct CompleteInvoker<void> {
+                template <typename Fun, typename... Args>
+                static CompleteType_t<void> invoke(Fun&& fun, Args&&... args) {
+                    std::forward<Fun>(fun)(std::forward<Args>(args)...);
+                    return {};
+                }
+            };
+
+            // invoke and not return void :(
+            template <typename Fun, typename... Args>
+            CompleteType_t<FunctionReturnType<Fun, Args...>> complete_invoke(Fun&& fun, Args&&... args) {
+                return CompleteInvoker<FunctionReturnType<Fun, Args...>>::invoke(std::forward<Fun>(fun), std::forward<Args>(args)...);
+            }
+
+            const std::string benchmarkErrorMsg = "a benchmark failed to run successfully";
+        } // namespace Detail
+
+        template <typename Fun>
+        Detail::CompleteType_t<FunctionReturnType<Fun>> user_code(Fun&& fun) {
+            CATCH_TRY{
+                return Detail::complete_invoke(std::forward<Fun>(fun));
+            } CATCH_CATCH_ALL{
+                getResultCapture().benchmarkFailed(translateActiveException());
+                CATCH_RUNTIME_ERROR(Detail::benchmarkErrorMsg);
+            }
+        }
+    } // namespace Benchmark
+} // namespace Catch
+
+#endif // TWOBLUECUBES_CATCH_DETAIL_COMPLETE_INVOKE_HPP_INCLUDED