diff --git a/include/stdex/curl.hpp b/include/stdex/curl.hpp
index 50600c192..5069c3c61 100644
--- a/include/stdex/curl.hpp
+++ b/include/stdex/curl.hpp
@@ -6,6 +6,7 @@
 #pragma once
 
 #include "compat.hpp"
+#include "exception.hpp"
 #include <curl/curl.h>
 #include <memory>
 #include <string>
@@ -16,7 +17,7 @@ namespace stdex
 	///
 	/// CURL runtime error
 	///
-	class curl_runtime_error : public std::runtime_error
+	class curl_runtime_error : public num_runtime_error<CURLcode>
 	{
 	public:
 		///
@@ -24,10 +25,9 @@ namespace stdex
 		///
 		/// \param[in] num CURL error code
 		///
-		curl_runtime_error(_In_ CURLcode num) :
-			runtime_error(curl_easy_strerror(num)),
-			m_num(num)
-		{}
+		curl_runtime_error(_In_ error_type num) : stdex::num_runtime_error<CURLcode>(num, curl_easy_strerror(num))
+		{
+		}
 
 		///
 		/// Constructs an exception
@@ -35,10 +35,9 @@ namespace stdex
 		/// \param[in] num CURL error code
 		/// \param[in] msg Error message
 		///
-		curl_runtime_error(_In_ CURLcode num, _In_ const std::string& msg) :
-			runtime_error(msg + ": " + curl_easy_strerror(num)),
-			m_num(num)
-		{}
+		curl_runtime_error(_In_ error_type num, _In_ const std::string& msg) : stdex::num_runtime_error<CURLcode>(num, msg + ": " + curl_easy_strerror(num))
+		{
+		}
 
 		///
 		/// Constructs an exception
@@ -46,21 +45,12 @@ namespace stdex
 		/// \param[in] num  CURL error code
 		/// \param[in] msg  Error message
 		///
-		curl_runtime_error(_In_ CURLcode num, _In_z_ const char *msg) :
-			runtime_error(std::string(msg) + ": " + curl_easy_strerror(num)),
-			m_num(num)
-		{}
-
-		///
-		/// Returns the error number
-		///
-		CURLcode number() const
+		curl_runtime_error(_In_ error_type num, _In_z_ const char *msg) : stdex::num_runtime_error<CURLcode>(num, std::string(msg) + ": " + curl_easy_strerror(num))
 		{
-			return m_num;
 		}
 
 	protected:
-		CURLcode m_num;  ///< Numeric error code
+		error_type m_num;  ///< Numeric error code
 	};
 
 	///
diff --git a/include/stdex/exception.hpp b/include/stdex/exception.hpp
index 88b1ef4f4..a688d2134 100644
--- a/include/stdex/exception.hpp
+++ b/include/stdex/exception.hpp
@@ -41,4 +41,48 @@ namespace stdex
 		catch (...) {}
 		return ex.what();
 	}
+
+	///
+	/// Numerical runtime error
+	///
+	template <typename _Tn>
+	class num_runtime_error : public std::runtime_error
+	{
+	public:
+		typedef _Tn error_type; ///< Error number type
+
+	public:
+		///
+		/// Constructs an exception
+		///
+		/// \param[in] num  Numeric error code
+		/// \param[in] msg  Error message
+		///
+		num_runtime_error(_In_ error_type num, _In_ const std::string& msg) :
+			m_num(num),
+			runtime_error(msg)
+		{}
+
+		///
+		/// Constructs an exception
+		///
+		/// \param[in] num  Numeric error code
+		/// \param[in] msg  Error message
+		///
+		num_runtime_error(_In_ error_type num, _In_z_ const char *msg) :
+			m_num(num),
+			runtime_error(msg)
+		{}
+
+		///
+		/// Returns the error number
+		///
+		error_type number() const
+		{
+			return m_num;
+		}
+
+	protected:
+		error_type m_num;  ///< Numeric error code
+	};
 }