upload codebase

Signed-off-by: Double Sine <xiao_ai_yu@live.cn>

common/exceptions/index_exception.hpp

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+#pragma once
+#include "../exception.hpp"
+
+namespace nkg::exceptions {
+
+    class index_exception : public ::nkg::exception {
+    public:
+        index_exception(std::string_view file, int line, std::string_view message) noexcept :
+            ::nkg::exception(file, line, message) {}
+    };
+
+}

common/exceptions/key_exception.hpp

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+#pragma once
+#include "../exception.hpp"
+
+namespace nkg::exceptions {
+
+    class key_exception : public ::nkg::exception {
+    public:
+        key_exception(std::string_view file, int line, std::string_view message) noexcept :
+            ::nkg::exception(file, line, message) {}
+    };
+
+}

common/exceptions/operation_canceled_exception.hpp

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+#pragma once
+#include "../exception.hpp"
+
+namespace nkg::exceptions {
+
+    class operation_canceled_exception : public ::nkg::exception {
+    public:
+        operation_canceled_exception(std::string_view file, int line, std::string_view message) noexcept :
+            ::nkg::exception(file, line, message) {}
+    };
+
+}

common/exceptions/unix_exception.hpp

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+#pragma once
+#include <errno.h>
+#include <string.h>
+#include "../exception.hpp"
+
+namespace nkg::exceptions {
+
+    class unix_exception : public ::nkg::exception {
+    public:
+        using error_code_t = decltype(errno);
+
+    private:
+        error_code_t m_error_code;
+        std::string m_error_string;
+
+    public:
+        unix_exception(std::string_view file, int line, error_code_t unix_errno, std::string_view message) noexcept :
+            ::nkg::exception(file, line, message), m_error_code(unix_errno), m_error_string(strerror(unix_errno)) {}
+
+        [[nodiscard]]
+        virtual bool error_code_exists() const noexcept override {
+            return true;
+        }
+
+        [[nodiscard]]
+        virtual intptr_t error_code() const noexcept override {
+            return m_error_code;
+        }
+
+        [[nodiscard]]
+        virtual const std::string& error_string() const noexcept override {
+            return m_error_string;
+        }
+    };
+
+}