feat(Exception)

include/basen.hpp

@@ -1,6 +1,7 @@
 #include <basen/base58.hpp>
 #include <basen/base64.hpp>
 #include <basen/baseN.hpp>
+#include <basen/Exception.hpp>
 #include <basen/hash/sha256.hpp>
 #include <basen/hex.hpp>
 

include/basen/Exception.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <cstdint>
+#include <exception>
+#include <source_location>
+#include <string>
+#include <unordered_map>
+
+namespace basen
+{
+    class Exception : public std::exception
+    {
+    public:
+        enum class Code
+        {
+            BASE,
+            PADDING,
+            CHECKSUM,
+            OVERFLOW,
+            LENGTH,
+            OUT_OF_ALPH,
+            ALPH_COLLISION
+        };
+        static const std::unordered_map<Code, std::string> messages;
+
+        Exception(Code code, const std::source_location &location = std::source_location::current());
+        const char *what() const noexcept override
+        {
+            return _what.c_str();
+        }
+        inline const char *message() const noexcept
+        {
+            return messages.at(_code).c_str();
+        }
+        inline Code code() const noexcept
+        {
+            return _code;
+        }
+
+    private:
+        Code _code;
+        std::string _what;
+    };
+}