Split void_type into its own header and rename it to void_t

src/CMakeLists.txt

@@ -140,6 +140,7 @@ set(INTERNAL_HEADERS
     ${SOURCES_DIR}/catch_translate_exception.hpp
     ${SOURCES_DIR}/internal/catch_uncaught_exceptions.hpp
     ${SOURCES_DIR}/internal/catch_unique_ptr.hpp
+    ${SOURCES_DIR}/internal/catch_void_type.hpp
     ${SOURCES_DIR}/catch_version.hpp
     ${SOURCES_DIR}/catch_version_macros.hpp
     ${SOURCES_DIR}/internal/catch_wildcard_pattern.hpp

src/catch2/catch_all.hpp

@@ -106,6 +106,7 @@
 #include <catch2/internal/catch_uncaught_exceptions.hpp>
 #include <catch2/internal/catch_unique_name.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
+#include <catch2/internal/catch_void_type.hpp>
 #include <catch2/internal/catch_wildcard_pattern.hpp>
 #include <catch2/internal/catch_windows_h_proxy.hpp>
 #include <catch2/internal/catch_xmlwriter.hpp>

src/catch2/catch_tostring.hpp

@@ -14,9 +14,11 @@
 #include <type_traits>
 #include <string>
 #include <string.h>
+
 #include <catch2/internal/catch_compiler_capabilities.hpp>
 #include <catch2/internal/catch_config_wchar.hpp>
 #include <catch2/internal/catch_stream.hpp>
+#include <catch2/internal/catch_void_type.hpp>
 #include <catch2/interfaces/catch_interfaces_enum_values_registry.hpp>
 
 #ifdef CATCH_CONFIG_CPP17_STRING_VIEW
@@ -474,19 +476,11 @@ namespace Catch {
     using std::end;
 
     namespace Detail {
-        template <typename...>
-        struct void_type {
-            using type = void;
-        };
-
-        template <typename... Ts>
-        using void_type_t = typename void_type<Ts...>::type;
-
         template <typename T, typename = void>
         struct is_range_impl : std::false_type {};
 
         template <typename T>
-        struct is_range_impl<T, void_type_t<decltype(begin(std::declval<T>()))>> : std::true_type {};
+        struct is_range_impl<T, void_t<decltype(begin(std::declval<T>()))>> : std::true_type {};
     } // namespace Detail
 
     template <typename T>

src/catch2/internal/catch_void_type.hpp

@@ -0,0 +1,25 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_VOID_TYPE_HPP_INCLUDED
+#define CATCH_VOID_TYPE_HPP_INCLUDED
+
+
+namespace Catch {
+    namespace Detail {
+
+        template <typename...>
+        struct make_void { using type = void; };
+
+        template <typename... Ts>
+        using void_t = typename make_void<Ts...>::type;
+
+    } // namespace Detail
+} // namespace Catch
+
+
+#endif // CATCH_VOID_TYPE_HPP_INCLUDED