Replace Hash CRTP base with a concept.

Chaos/Hash/Hash.hpp

@@ -1,38 +1,17 @@
 #ifndef CHAOS_HASH_HASH_HPP
 #define CHAOS_HASH_HASH_HPP
 
+#include <concepts>
 #include <string>
 
 namespace Chaos::Hash
 {
 
 template<typename T>
-class Hash
+concept Hash = requires(T hash)
 {
-public:
+    hash.GetRawDigest();
-    auto GetRawDigest() const
+    { hash.ToHexString() } -> std::same_as<std::string>;
-    {
-        return Impl().GetRawDigest();
-    }
-
-    std::string ToHexString() const
-    {
-        return Impl().ToHexString();
-    }
-
-protected:
-    Hash() = default;
-
-private:
-    const T & Impl() const
-    {
-        return static_cast<const T &>(*this);
-    }
-
-    T & Impl()
-    {
-        return static_cast<T &>(*this);
-    }
 };
 
 } // namespace Chaos::Hash

Chaos/Hash/Md4.hpp

@@ -136,7 +136,7 @@ private:
 namespace Chaos::Hash::Md4
 {
 
-struct Md4Hash : public Hash<Md4Hash>
+struct Md4Hash
 {
     std::array<uint8_t, 16> GetRawDigest() const
     {
@@ -161,6 +161,8 @@ struct Md4Hash : public Hash<Md4Hash>
     std::array<uint8_t, 16> RawDigest_;
 };
 
+static_assert(Hash<Md4Hash>);
+
 class Md4Hasher : public Hasher<Md4Hasher>
 {
 public:

Chaos/Hash/Md5.hpp

@@ -160,7 +160,7 @@ private:
 namespace Chaos::Hash::Md5
 {
 
-struct Md5Hash : public Hash<Md5Hash>
+struct Md5Hash
 {
     std::array<uint8_t, 16> GetRawDigest() const
     {
@@ -185,6 +185,8 @@ struct Md5Hash : public Hash<Md5Hash>
     std::array<uint8_t, 16> RawDigest_;
 };
 
+static_assert(Hash<Md5Hash>);
+
 class Md5Hasher : public Hasher<Md5Hasher>
 {
 public:

Chaos/Hash/Sha1.hpp

@@ -129,7 +129,7 @@ private:
 namespace Chaos::Hash::Sha1
 {
 
-struct Sha1Hash : public Hash<Sha1Hash>
+struct Sha1Hash
 {
     std::array<uint8_t, 20> GetRawDigest() const
     {
@@ -155,6 +155,8 @@ struct Sha1Hash : public Hash<Sha1Hash>
     std::array<uint8_t, 20> RawDigest_;
 };
 
+static_assert(Hash<Sha1Hash>);
+
 class Sha1Hasher : public Hasher<Sha1Hasher>
 {
 public: