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-# CLAUDE.md
-
-This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
-
-## Project Overview
-
-OCL.FIX is a C++20 library for parsing Financial Information Exchange (FIX) protocol messages. The library is part of the Open C++ Libraries (OCL) family and follows the Boost Software License.
-
-## Build System
-
-The project uses CMake as its build system.
-
-### Building the Library
-
-```bash
-# Configure and build from project root
-cmake -B build
-cmake --build build
-
-# Install the library
-cmake --install build
-```
-
-### Building and Running Tests
-
-Tests use Google Test and are located in `test/fix_basic/`:
-
-```bash
-# Build and run all tests
-cd test/fix_basic
-cmake -B build
-cmake --build build
-cd build && ctest
-
-# Run specific test binary directly
-./FIXTestBasic
-```
-
-### Building Examples
-
-```bash
-cd example/fix_tag_example
-cmake -B build
-cmake --build build
-./build/FixExample
-```
-
-## Architecture
-
-### Core Components
-
-1. **Parser (`include/ocl/fix/parser.hpp`, `src/fix/parser_impl.cpp`)**
-   - `ocl::fix::visitor`: The main parser class using the Pimpl idiom
-   - `ocl::fix::range_buffer`: Container for parsed FIX message tags and values
-   - `ocl::fix::range`: Buffer+Length structure for byte ranges
-   - FIX message format: SOH-delimited (0x01) tag=value pairs
-
-2. **Implementation Pattern**
-   - Uses Pimpl (Pointer to Implementation) idiom to hide implementation details
-   - `visitor::impl` is defined in `parser_impl.cpp` and forward-declared in the header
-   - Conditional compilation controlled by `OCL_FIX_HAS_IMPL` macro
-   - When `OCL_FIX_HAS_IMPL` is not defined, a stub `impl` struct is provided
-
-3. **FIX Message Parsing**
-   - Parses tag=value pairs separated by SOH (Start of Header, 0x01) character
-   - Tag "8" contains the FIX version (e.g., "FIX.4.2")
-   - `range_buffer::operator[]` retrieves values by tag number
-   - `range_buffer::is_valid()` checks if tag "8" exists
-
-### Dependencies
-
-- **OCL.Core**: Parent library providing `ocl/detail/config.hpp`, `ocl/crc_hash.hpp`, and `ocl/print.hpp`
-- **Boost**: Required for `boost::string_view` and other utilities
-- **C++20**: Required for language features
-
-### Directory Structure
-
-```
-include/ocl/fix/          # Public API headers
-  parser.hpp              # Main parser interface
-  checksum.hpp            # Checksum utilities (currently stub)
-  detail/config.hpp       # Configuration and OCL dependencies
-src/fix/                  # Implementation
-  parser_impl.cpp         # Parser implementation with Pimpl
-test/fix_basic/           # Google Test unit tests
-example/fix_tag_example/  # Example usage
-```
-
-## Development Notes
-
-### Code Style
-
-- C++20 standard enforced
-- Includes `.clang-format` configuration
-- Run `./format.sh` to format code
-
-### Working with the Parser
-
-When modifying the parser:
-- Implementation goes in `src/fix/parser_impl.cpp` with `OCL_FIX_HAS_IMPL` defined
-- Public API changes go in `include/ocl/fix/parser.hpp`
-- The `visitor::impl` struct contains the actual parsing logic
-- Remember to handle both the constructor initialization and the Pimpl pointer
-
-### Testing
-
-- Test files should verify both valid and invalid FIX messages
-- Use constexpr character arrays with SOH (0x01) separators for test messages
-- Verify tag retrieval returns correct values and empty strings for missing tags