2 files changed, 34 insertions, 6 deletions
diff --git a/src/common/Cryptography/Authentication/SRP6.cpp b/src/common/Cryptography/Authentication/SRP6.cpp
index a2266f35f71..c172bbc1d3d 100644
--- a/src/common/Cryptography/Authentication/SRP6.cpp
+++ b/src/common/Cryptography/Authentication/SRP6.cpp
@@ -24,12 +24,7 @@
 using SHA1 = Trinity::Crypto::SHA1;
 using SRP6 = Trinity::Crypto::SRP6;
 
-/*static*/ std::array<uint8, 1> const SRP6::g = []()
-{
-    std::array<uint8, 1> g_temp;
-    g_temp[0] = 7;
-    return g_temp;
-}();
+/*static*/ std::array<uint8, 1> const SRP6::g = { 7 };
 /*static*/ std::array<uint8, 32> const SRP6::N = HexStrToByteArray<32>("894B645E89E1535BBDAD5B8B290650530801B18EBFBF5E8FAB3C82872A3E9BB7", true);
 /*static*/ BigNumber const SRP6::_g(SRP6::g);
 /*static*/ BigNumber const SRP6::_N(N);
diff --git a/src/common/Utilities/Concepts.h b/src/common/Utilities/Concepts.h
new file mode 100644
index 00000000000..4cfa52c029c
--- /dev/null
+++ b/src/common/Utilities/Concepts.h
@@ -0,0 +1,33 @@
+/*
+ * 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_CONCEPTS_H
+#define TRINITYCORE_CONCEPTS_H
+
+#include <concepts>
+#include <functional> // std::invoke
+
+namespace Trinity
+{
+template <typename Callable, typename R, typename... Args>
+concept invocable_r = requires(Callable && callable, Args&&... args)
+{
+    { std::invoke(static_cast<Callable&&>(callable), static_cast<Args&&>(args)...) } -> std::convertible_to<R>;
+};
+}
+
+#endif // TRINITYCORE_CONCEPTS_H