Add documentation for the enum descriptions

[liuzicheng1987]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request introduces new documentation for a feature in reflect-cpp that enables developers to embed descriptive text for enum values directly into generated JSON schemas. This enhancement significantly improves the clarity and self-documenting nature of API specifications by providing richer context for enum types, all without affecting the underlying serialization and deserialization processes.

Highlights

• New Documentation for Enum Descriptions: A new documentation page, docs/enum_descriptions.md, has been added to explain how to incorporate descriptions for enum values within JSON schemas generated by reflect-cpp.
• Enhanced JSON Schema Generation: The documentation details the use of rfl::config::enum_descriptions to specialize enum types, allowing individual enum values to carry descriptive text that appears in the generated JSON schema using oneOf with const and description fields.
• No Impact on Serialization/Deserialization: The new feature for adding enum descriptions is clarified to only affect JSON schema generation and does not alter the existing serialization or deserialization behavior of enum values.
• Documentation Integration: The mkdocs.yaml configuration has been updated to include the new enum_descriptions.md page in the project's navigation structure.

Changelog

• docs/enum_descriptions.md
  • Added a new documentation page explaining how to add descriptions to enum values for JSON schema generation in reflect-cpp.
• mkdocs.yaml
  • Updated the navigation configuration to include the new enum_descriptions.md documentation page under the 'JSON schema' section.

Activity

• No human activity (comments, reviews) has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the new enum descriptions feature. The documentation is clear and covers the main aspects of usage. I've found a small inconsistency in one of the JSON examples and have a suggestion to improve the C++ code example to promote better maintenance practices. Overall, a good addition to the documentation.

[gemini-code-assist]

While using a default case is safe, it might be worth adding a note to the documentation about an alternative approach. By omitting the default case and explicitly handling all enum values, developers can leverage compiler warnings (e.g., -Wswitch on GCC/Clang) to detect unhandled enum values when the enum is updated. This helps ensure that descriptions are always provided for all values and is a common C++ best practice.

[gemini-code-assist]

The generated JSON schema in this example is inconsistent with the one in the 'Basic usage' section. It's missing the top-level schema structure ($schema, $ref, $defs) and the required property. To avoid confusion and maintain consistency, this example should also show a complete and valid JSON schema for the Config struct.

Suggested change

	{
	"type": "object",
	"properties": {
	"size": {
	"type": "string",
	"enum": ["small", "medium", "large"]
	}
	}
	}
	{
	"$schema": "https://json-schema.org/draft/2020-12/schema",
	"$ref": "#/$defs/Config",
	"$defs": {
	"Config": {
	"type": "object",
	"properties": {
	"size": {
	"type": "string",
	"enum": ["small", "medium", "large"]
	}
	},
	"required": ["size"]
	}
	}
	}