Allow Compare and Allocator on map-like data structures; resolves #561

[liuzicheng1987]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @liuzicheng1987, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the flexibility of the rfl library by enabling it to correctly parse and serialize standard library map-like and set-like containers that employ custom comparison functions or memory allocators. This addresses a previous limitation, allowing developers to use these containers with their specific configurations without encountering parsing issues, thereby enhancing the library's compatibility and robustness.

Highlights

• Enhanced Map-like Container Support: The Parser templates for std::map, std::multimap, std::set, and std::multiset have been extended to correctly handle custom Compare and Allocator template parameters. This allows the library to serialize and deserialize these containers even when non-default comparators or allocators are used.
• Updated Type Traits: The is_map_like and is_map_like_not_multimap type traits were modified to accurately recognize std::map and std::multimap types that include custom Compare and Allocator parameters, ensuring correct type deduction within the parsing framework.
• New Test Case: A new test file, test_map_with_custom_less.cpp, was added to validate the serialization and deserialization of a std::map using a custom std::less<> comparator, confirming the functionality introduced by these changes.

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[gemini-code-assist]

Code Review

This pull request successfully extends the Parser and is_map_like specializations to correctly handle std::map, std::multimap, std::set, and std::multiset when custom Compare and Allocator template parameters are used. This resolves the issue of not being able to parse map-like data structures with non-default comparators or allocators. The addition of test_map_with_custom_less.cpp provides a good test case for the new functionality.