Summary

Create C++20 module files for container_system as part of the Tier 1 core libraries.

Parent Epic

Part of kcenon/common_system#256 (C++20 Module Migration - Cross-System Preparation)

Prerequisites

• Remove deprecation.h ([REFACTOR] Remove deprecation.h - C++20 Module preparation #221)
• [MODULE] Create C++20 module files for kcenon.common common_system#269 - common_system module (Tier 0)

Proposed Module Structure

// Primary module interface (single module - small codebase)
export module kcenon.container;

import kcenon.common;  // Tier 0 dependency

// Export all container functionality

Module Design

Container system is small enough to be a single module without partitions.

File Structure

src/modules/
└── container.cppm           # Single module file

CMake Configuration

cmake_minimum_required(VERSION 3.28)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_SCAN_FOR_MODULES ON)

add_library(kcenon_container)
target_sources(kcenon_container
    PRIVATE FILE_SET CXX_MODULES
    FILES
        src/modules/container.cppm
)

Tasks

• Complete deprecation.h removal ([REFACTOR] Remove deprecation.h - C++20 Module preparation #221) first
• Wait for common_system module (Tier 0) completion
• Create module directory structure
• Create container.cppm module file
• Update CMakeLists.txt for module support
• Verify no circular module dependencies
• Update all tests to use modules
• Update documentation

Acceptance Criteria

• Module builds successfully with CMake 3.28+
• Successfully imports kcenon.common module
• All existing tests pass with module
• No circular dependencies
• Header-based build still works (transition period)

Migration Timeline

This is Phase 2 work (Release N+3) per EPIC:

• Blocked by: common_system module, deprecation.h removal

Related

• C++20 Module Migration Epic ([EPIC] C++20 Module Migration - Cross-System Preparation common_system#256)
• Remove deprecation.h ([REFACTOR] Remove deprecation.h - C++20 Module preparation #221) - prerequisite