Move constify to own header

Author: steve-downey

src/Beman/Optional26/tests/CMakeLists.txt

@@ -19,7 +19,8 @@ target_sources(
   optional_ref.t.cpp
   optional.t.cpp
   optional_constexpr.t.cpp
-  test_types.cpp)
+  test_types.cpp
+  test_utilities.cpp)
 
 target_link_libraries(
   beman_optional26_test

src/Beman/Optional26/tests/optional_constexpr.t.cpp

@@ -3,6 +3,7 @@
 
 #include <Beman/Optional26/optional.hpp>
 #include <Beman/Optional26/tests/test_types.hpp>
+#include <Beman/Optional26/tests/test_utilities.hpp>
 
 #include <functional>
 #include <ranges>
@@ -220,7 +221,7 @@ consteval bool testConstexprInPlace() {
     return retval;
 }
 
-auto consteval constify(auto expr) { return (expr); }
+using beman::optional26::tests::constify;
 
 TEST(OptionalConstexprTest, InPlace) {
     EXPECT_TRUE(constify(testConstexprInPlace()));

src/Beman/Optional26/tests/test_utilities.cpp

@@ -0,0 +1,4 @@
+// src/Beman/Optional26/test/test_utilities.cpp                       -*-C++-*-
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include <Beman/Optional26/tests/test_utilities.hpp>

src/Beman/Optional26/tests/test_utilities.hpp

@@ -0,0 +1,15 @@
+// src/Beman/Optional26/tests/test_utilities.hpp                      -*-C++-*-
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#ifndef BEMAN_OPTIONAL26_TESTS_TEST_UTILITIES_HPP
+#define BEMAN_OPTIONAL26_TESTS_TEST_UTILITIES_HPP
+
+namespace beman::optional26::tests {
+/***
+ * Evaluate and return an expression in a consteval context for testing
+ * constexpr correctness.
+ */
+auto consteval constify(auto expr) { return (expr); }
+} // namespace beman::optional26::tests
+
+#endif