chore: define FMT_CONSTEVAL

Author: vinniefalco

include/mrdox/Platform.hpp

@@ -78,6 +78,10 @@ namespace mrdox {
 # endif
 #endif
 
+#if ! defined(__GNUC__) && defined(_MSC_VER)
+#define FMT_CONSTEVAL
+#endif
+
 } // mrdox
 } // clang
 

include/mrdox/Support/Format.hpp

@@ -0,0 +1,43 @@
+//
+// Licensed under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+// Copyright (c) 2023 Vinnie Falco ([email protected])
+//
+// Official repository: https://github.com/cppalliance/mrdox
+//
+
+#ifndef MRDOX_API_SUPPORT_FORMAT_HPP
+#define MRDOX_API_SUPPORT_FORMAT_HPP
+
+#include <mrdox/Platform.hpp>
+#include <fmt/format.h>
+#include <source_location>
+
+namespace clang {
+namespace mrdox {
+
+template<class... Args>
+struct FormatString
+{
+    template<class T>
+    FormatString(
+        T const& fs_,
+        std::source_location loc_ =
+            std::source_location::current())
+        : fs(fs_)
+        , loc(loc_)
+    {
+        static_assert(std::is_constructible_v<
+            std::string_view, T const&>);
+    }
+
+    std::string_view fs;
+    std::source_location loc;
+};
+
+} // mrdox
+} // clang
+
+#endif