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slick-object-pool - Documentation Guide

Overview

This document provides a comprehensive guide to the documentation in slick/object_pool.h.

Documentation Style

The code uses Doxygen-style documentation comments for automatic API documentation generation.

Doxygen Tags Used

Tag Purpose Example
@file File description File-level overview
@brief Short description One-line summary
@details Detailed description In-depth explanation
@tparam Template parameter Template type requirements
@param Function parameter Parameter description
@return Return value What the function returns
@throws Exception specification When exceptions are thrown
@note Important note Additional information
@warning Warning Critical warnings
@pre Precondition Requirements before calling
@post Postcondition State after calling
@par Paragraph heading Subsection headers
@code/@endcode Code example Inline code examples
@section Documentation section Major sections
/// Inline comment Member variable docs

Documentation Coverage

File-Level Documentation

Includes:

  • Brief description of the library
  • Detailed feature list
  • Memory layout diagram
  • Type requirements
  • Thread safety guarantees
  • Usage examples
  • Author and version information

Class Documentation

ObjectPool Template Class

Comprehensive documentation covering:

  • Purpose and design
  • Template type requirements
  • Thread safety model
  • Performance characteristics
  • Example usage patterns

Public API Documentation

Constructors

  1. ObjectPool(uint32_t size)
    • Full parameter documentation
    • Exception specifications
    • Preconditions and postconditions
    • Usage examples

Destructor

  • Cleanup behavior documentation
  • Important warnings

Public Methods

  1. uint32_t size() const

    • Pool size query
    • Power-of-2 note

  2. T allocate()*

    • Comprehensive documentation
    • Behavior under different conditions
    • Performance characteristics
    • Thread safety guarantees
    • Usage examples
    • Important warnings

  3. void free(T obj)*

    • Dual behavior (pool vs heap)
    • Automatic detection mechanism
    • Performance notes
    • Critical warnings

  4. void reset()

    • Purpose and use cases
    • Thread safety warnings
    • Testing vs production use

Private Implementation Documentation

Internal Methods

  1. uint64_t reserve(uint32_t n)

    • Lock-free reservation mechanism
    • Ring buffer wrapping
    • Exception specification

  2. operator[](uint64_t index)

    • Array access semantics
    • Both const and non-const versions

  3. void publish(uint64_t index, uint32_t n)

    • Synchronization mechanism
    • Memory ordering notes

  4. std::pair<T, uint32_t> consume()*

    • Consumption logic
    • Lock-free guarantees
    • Return value meaning

Member Variables

All member variables are documented with inline comments (///):

  • Configuration: size_, mask_
  • Storage: buffer_, lower_bound_, upper_bound_, free_objects_
  • Control: control_, reserved_, consumed_

Internal Structures

  1. struct slot

    • Purpose and usage
    • Member documentation

  2. struct reserved_info

    • Producer coordination
    • Field meanings

Generating API Documentation

Using Doxygen

  1. Install Doxygen:

    # Ubuntu/Debian
sudo apt-get install doxygen graphviz

# macOS
brew install doxygen graphviz

# Windows
# Download from https://www.doxygen.nl/download.html

  2. Create Doxyfile:

    cd d:\repo\slick-object-pool
doxygen -g

  3. Configure Doxyfile:

    PROJECT_NAME           = "slick-object-pool"
PROJECT_BRIEF          = "Lock-free object pool for C++20"
PROJECT_VERSION        = "0.1.0"
OUTPUT_DIRECTORY       = docs
INPUT                  = include/slick
RECURSIVE              = YES
EXTRACT_ALL            = YES
EXTRACT_PRIVATE        = NO
EXTRACT_STATIC         = YES
GENERATE_HTML          = YES
GENERATE_LATEX         = NO
SOURCE_BROWSER         = YES
INLINE_SOURCES         = YES
HAVE_DOT               = YES
CALL_GRAPH             = YES
CALLER_GRAPH           = YES

  4. Generate Documentation:

    doxygen Doxyfile

  5. View Documentation:

    # Open in browser
open docs/html/index.html  # macOS
xdg-open docs/html/index.html  # Linux
start docs/html/index.html  # Windows

Documentation Best Practices

What's Documented

✅ All public APIs - Complete parameter and return value docs ✅ Examples - Working code examples for common use cases ✅ Thread safety - Explicit guarantees and warnings ✅ Performance - Expected performance characteristics ✅ Exceptions - What exceptions are thrown and when ✅ Preconditions - Requirements before calling ✅ Postconditions - Expected state after calling ✅ Warnings - Critical usage warnings ✅ Platform notes - Platform-specific behavior

Documentation Quality

Aspect Coverage
Public API 100%
Private methods 100%
Member variables 100%
Code examples Extensive
Thread safety Explicit
Performance notes Detailed
Platform specifics Complete

Reading the Documentation

For Users (Public API)

Focus on:

  • Constructor documentation
  • allocate() and free() methods
  • Thread safety guarantees
  • Code examples
  • Warnings and notes

For Contributors (Implementation)

Additionally review:

  • Private method documentation
  • Internal structure documentation
  • Memory layout details
  • Platform-specific implementations

For Library Maintainers

Full documentation including:

  • Implementation algorithms
  • Memory ordering semantics
  • Platform-specific details
  • Performance characteristics

Documentation Examples

Well-Documented Function

/**
 * @brief Allocate an object from the pool
 *
 * @details
 * Attempts to allocate an object from the pool using lock-free operations.
 * If the pool is exhausted, allocates a new object from the heap instead.
 *
 * This method is thread-safe and lock-free for multiple concurrent callers.
 *
 * @return Pointer to an object (never returns nullptr)
 *
 * @par Behavior
 * - Pool has available objects: Returns pooled object (fast path)
 * - Pool is exhausted: Allocates from heap (slower fallback)
 *
 * @par Performance
 * - Average: O(1) with low latency (~10-30ns typical)
 * - Worst case: O(number of concurrent allocators) due to CAS retry
 *
 * @par Thread Safety
 * Lock-free, safe for concurrent calls from multiple threads
 *
 * @par Example
 * @code
 * slick::ObjectPool<MyStruct> pool(1024);
 * MyStruct* obj = pool.allocate();
 * obj->field = value;
 * pool.free(obj);
 * @endcode
 *
 * @note Must be paired with free() to avoid memory leaks
 * @note Returned object is NOT automatically initialized
 */
T* allocate();

Key Elements

  1. Brief - One line summary
  2. Details - In-depth explanation
  3. Return - What it returns
  4. Behavior - Different scenarios
  5. Performance - Expected performance
  6. Thread Safety - Concurrency guarantees
  7. Example - Working code
  8. Notes - Important information

Updating Documentation

When to Update

  • Adding new public methods
  • Changing method signatures
  • Modifying behavior
  • Adding new features
  • Fixing bugs that change semantics
  • Performance improvements

Documentation Checklist

When adding/modifying code:

  • Add/update @brief description
  • Add/update @details if complex
  • Document all parameters with @param
  • Document return value with @return
  • List exceptions with @throws
  • Add thread safety notes
  • Include performance characteristics
  • Add code example if helpful
  • Add warnings if needed
  • Update file-level docs if major change

Related Documentation

  • README.md - User-facing documentation and examples
  • CHANGES.md - Migration guide and changelog
  • Comments in code - Implementation notes (not in public API docs)

Documentation Version: 1.0 Last Updated: 2025 Maintained By: SlickQuant