Core/Misc: Move fmt::formatter forward declaration to a common header to reduce number of replacements needed when upgrading fmt to new major version

1 files changed, 51 insertions, 0 deletions

diff --git a/src/common/Utilities/StringFormatFwd.h b/src/common/Utilities/StringFormatFwd.h
new file mode 100644
index 00000000000..37990636f41
--- /dev/null
+++ b/src/common/Utilities/StringFormatFwd.h
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TRINITYCORE_STRING_FORMAT_FWD_H
+#define TRINITYCORE_STRING_FORMAT_FWD_H
+
+#include <stdexcept>
+
+namespace fmt
+{
+inline namespace v10
+{
+template <typename T, typename Char, typename Enable>
+struct formatter;
+}
+}
+
+namespace Trinity
+{
+struct NoArgFormatterBase
+{
+    template <typename ParseContext>
+    constexpr typename ParseContext::iterator parse(ParseContext& ctx)
+    {
+        auto begin = ctx.begin(), end = ctx.end();
+        if (begin == end)
+            return begin;
+
+        if (*begin != '}')
+            throw std::invalid_argument("invalid type specifier");
+
+        return begin;
+    }
+};
+}
+
+#endif // TRINITYCORE_STRING_FORMAT_FWD_H