ann_assign_map.json - api link

ann_assign_map.json can only be used with the custom_mapping and custom_mapping_starts_with options.

If you put a file .pypp/transpiler_config/ann_assign_map.json in your project:

{
    "custom_mapping": {
        "CustomType[int]": {
            "mapping_function": "ann_assign.py"
        }
    }
}

# ann_assign.py
def mapping_function(
    _type_cpp: str, target_str: str, _value_str: str, value_str_stripped: str
):
    return (
        "CustomType<int> "
        + target_str
        + "="
        + "CustomType<int>("
        + value_str_stripped
        + ")"
    )

then, when you write an annotated assignment, like a: CustomType[int] = CustomType(4, 2), it will be converted to CustomType<int> a = CustomType<int>(4, 2) in the generated C++ code.