ddl2cpp: Cleanup part 4.2#78

Merged

rbock merged 11 commits intorbock:mainfrom

MeanSquaredError:ddl2cpp_cleanup_4

Oct 21, 2025

Commits on Oct 20, 2025

ddl2cpp: Rename command-line option --path-to-datatype-file -> --path-to-custom-types
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ddl2cpp: Rename get_extended_types() -> get_custom_types().
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ddl2cpp: Move the code that cleans custom type names into an inner function.
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ddl2cpp: If custom types are defined, check if the base types are valid. If not then display a meaningful error message and exit with a specific error code.
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ddl2cpp: When defining custom types accept both snake_case and CamelCase names for the base types. This provides compatibility with the old behavior where only CamelCase names were accepted.
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ddl2cpp: Rename a function parameter: key -> base_type.
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ddl2cpp: Display all errors and warnings in a uniform fashion.
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