feat: FIX library improvements, prepping release.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

7 files changed, 78 insertions, 19 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1829925..19ca3fa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,7 @@ find_package(Boost REQUIRED)
 
 add_library(ocl_fix src/fix/parser_impl.cpp)
 target_link_libraries(ocl_fix boost_core)
+target_include_directories(ocl_fix PUBLIC ${BOOST_INCLUDE_DIRS})
 
 install(DIRECTORY include/ DESTINATION include)
 install(TARGETS ocl_fix DESTINATION lib)
diff --git a/example/fix_tag_example/CMakeLists.txt b/example/fix_tag_example/CMakeLists.txt
index 56afa24..ca6d6dd 100644
--- a/example/fix_tag_example/CMakeLists.txt
+++ b/example/fix_tag_example/CMakeLists.txt
@@ -9,6 +9,7 @@ project(
 find_package(Boost REQUIRED)
 
 add_executable(FixExample example.cpp)
+target_include_directories(FixExample PUBLIC ${BOOST_INCLUDE_DIRS})
 
 set_property(TARGET FixExample PROPERTY CXX_STANDARD 20)
 target_include_directories(FixExample PUBLIC ../../include/ocl)
diff --git a/example/fix_tag_example/example.cpp b/example/fix_tag_example/example.cpp
index cb758c2..efd66f8 100644
--- a/example/fix_tag_example/example.cpp
+++ b/example/fix_tag_example/example.cpp
@@ -1,3 +1,8 @@
+// Copyright 2025-2026, Amlal El Mahrouss (amlal@nekernel.org)
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+// Official repository: https://github.com/ocl-org/fix
+
 #include <ocl/fix/parser.hpp>
 #include <ocl/fix/checksum.hpp>
 
@@ -15,18 +20,16 @@ constexpr char const default_fix[] = {
 };
 
 constexpr char default_fix_unchecked[] = {
-        '8', '=', 'F', 'I', 'X', '.', '4', '.', '2', 0x01,
-        '9', '=', '8', '0', 0x01, // BodyLength = 80
-        '3', '5', '=', 'A', 0x01,
-        '4', '9', '=', 'S', 'E', 'R', 'V', 'E', 'R', 0x01,
-        '5', '6', '=', 'C', 'L', 'I', 'E', 'N', 'T', 0x01,
-        '3', '4', '=', '1', '7', '7', 0x01,
-        '5', '2', '=', '2', '0', '0', '9', '0', '1', '0', '7', '-', '1', '8', ':', '1', '5', ':', '1', '6', 0x01,
-        '9', '8', '=', '0', 0x01,
-        '1', '0', '8', '=', '3', '0', 0x01,
-        0x00
-};
-
+	'8', '=', 'F', 'I', 'X', '.', '4', '.', '2', 0x01,
+	'9', '=', '8', '0', 0x01, // BodyLength = 80
+	'3', '5', '=', 'A', 0x01,
+	'4', '9', '=', 'S', 'E', 'R', 'V', 'E', 'R', 0x01,
+	'5', '6', '=', 'C', 'L', 'I', 'E', 'N', 'T', 0x01,
+	'3', '4', '=', '1', '7', '7', 0x01,
+	'5', '2', '=', '2', '0', '0', '9', '0', '1', '0', '7', '-', '1', '8', ':', '1', '5', ':', '1', '6', 0x01,
+	'9', '8', '=', '0', 0x01,
+	'1', '0', '8', '=', '3', '0', 0x01,
+	0x00};
 
 int main(int argc, char** argv)
 {
diff --git a/include/ocl/fix/checksum.hpp b/include/ocl/fix/checksum.hpp
index 6492acf..a5e4469 100644
--- a/include/ocl/fix/checksum.hpp
+++ b/include/ocl/fix/checksum.hpp
@@ -18,12 +18,17 @@ namespace ocl::fix
 	/// \brief Returns the checksum index of a FIX message.
 	/// \param range the range_buffer containing the message.
 	/// \throws runtime_error if the FIX message is invalid (missing tag "8").
+
 	inline std::string try_index_checksum(range_buffer& fix)
 	{
 		if (fix.is_valid())
 			return fix["10"];
 		else
-			detail::throw_runtime_error();
+			::ocl::fix::detail::throw_runtime_error();
+
+		::ocl::fix::detail::unreachable();
+
+		return {};
 	}
 
 	/// \brief FIX message operators namespace.
@@ -41,9 +46,8 @@ namespace ocl::fix
 			checksum_type cks{};
 
 			for (std::size_t idx{};
-			     idx < in_.size(); ++idx)
-		          cks += static_cast<uint8_t>(in_[idx]);
-		        
+				 idx < in_.size(); ++idx)
+				cks += static_cast<uint8_t>(in_[idx]);
 
 			// add \0
 			cks += 1;
diff --git a/include/ocl/fix/detail/config.hpp b/include/ocl/fix/detail/config.hpp
index 0568f90..b73454e 100644
--- a/include/ocl/fix/detail/config.hpp
+++ b/include/ocl/fix/detail/config.hpp
@@ -12,4 +12,25 @@
 #include <ocl/crc_hash.hpp>
 #include <ocl/print.hpp>
 
+namespace ocl::fix::detail
+{
+
+	inline void throw_runtime_error(const boost::source_location& location = BOOST_CURRENT_LOCATION)
+	{
+		throw std::runtime_error(location.to_string());
+	}
+
+	inline void unreachable() noexcept
+	{
+#if defined(__GNUC__) || defined(__clang__)
+		__builtin_unreachable();
+#elif defined(_MSC_VER)
+		__assume(false);
+#else
+		std::abort();
+#endif
+	}
+
+} // namespace ocl::fix::detail
+
 #endif
diff --git a/include/ocl/fix/parser.hpp b/include/ocl/fix/parser.hpp
index ceba660..9268662 100644
--- a/include/ocl/fix/parser.hpp
+++ b/include/ocl/fix/parser.hpp
@@ -5,10 +5,16 @@
  * Copyright 2025, Amlal El Mahrouss, licensed under the Boost Software License.
  */
 
+// Copyright 2025-2026, Amlal El Mahrouss (amlal@nekernel.org)
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+// Official repository: https://github.com/ocl-org/fix
+
 #ifndef __OCL_FIX_PARSER
 #define __OCL_FIX_PARSER
 
 #include <ocl/fix/detail/config.hpp>
+#include <fstream>
 #include <string>
 #include <memory>
 
@@ -52,6 +58,14 @@ namespace ocl::fix
 		return std::string(range.bytes_, range.length_);
 	}
 
+	inline std::string to_string(const range& range) noexcept
+	{
+		if (range.length_ < 1)
+			return std::string{};
+
+		return std::string(range.bytes_, range.length_);
+	}
+
 	/// @brief a range object containing the FIX packet values.
 	class range_buffer final
 	{
@@ -60,7 +74,7 @@ namespace ocl::fix
 		std::string					magic_{};
 		string_hash_map<value_type> message_{};
 
-		static inline const char* begin;
+		static boost::string_view& begin;
 
 		explicit range_buffer() = default;
 		~range_buffer()			= default;
@@ -120,4 +134,16 @@ namespace ocl::fix
 
 } // namespace ocl::fix
 
+inline std::ostream& operator<<(std::ostream& os, ocl::fix::range& r)
+{
+	os << ocl::fix::to_string(r);
+	return os;
+}
+
+inline std::ostream& operator<<(std::ostream& os, const ocl::fix::range& r)
+{
+	os << ocl::fix::to_string(r);
+	return os;
+}
+
 #endif // ifndef __OCL_FIX_PARSER
diff --git a/src/fix/parser_impl.cpp b/src/fix/parser_impl.cpp
index b776dcd..27ea01d 100644
--- a/src/fix/parser_impl.cpp
+++ b/src/fix/parser_impl.cpp
@@ -13,10 +13,13 @@ namespace ocl::fix
 
 	namespace detail
 	{
-		inline const char* begin_fix() noexcept
+
+		inline boost::string_view& begin_fix() noexcept
 		{
-			return "FIX.4.2";
+			static boost::string_view begin_fix{"FIX.4.2"};
+			return begin_fix;
 		}
+
 	} // namespace detail
 
 	struct visitor::impl final