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Preserve type when applying optimize_mapper #240

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Merged
inducer merged 1 commit into from
Feb 27, 2026
Merged

Preserve type when applying optimize_mapper #240

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9 changes: 6 additions & 3 deletions pymbolic/mapper/optimize.py
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Original file line number Diff line number Diff line change
Expand Up @@ -262,18 +262,21 @@ def _set_and_return(
return value


MapperT = TypeVar("MapperT", bound=type)


def optimize_mapper(
*, drop_args: bool = False, drop_kwargs: bool = False,
inline_rec: bool = False, inline_cache: bool = False,
inline_get_cache_key: bool = False,
print_modified_code_file: TextIO | None = None) -> Callable[[type], type]:
print_modified_code_file: TextIO | None = None) -> Callable[[MapperT], MapperT]:
"""
:param print_modified_code_file: a file-like object to which the modified
code will be printed, or ``None``.
"""
# This is a crime, an abomination. But a somewhat effective one.

def wrapper(cls: type) -> type:
def wrapper(cls: MapperT) -> MapperT:
try:
# Introduced in Py3.9
ast.unparse # noqa: B018
Expand Down Expand Up @@ -398,7 +401,7 @@ def wrapper(cls: type) -> type:
"exec"),
compile_dict)

return cast("type", compile_dict[cls.__name__])
return cast("MapperT", compile_dict[cls.__name__])

return wrapper

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