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For the complete Mojo documentation index, see llms.txt. Markdown versions of all pages are available by appending .md to any URL (e.g. /docs/manual/basics.md).

function

Compile-time reflection over function values.

reflect_fn[func] is a comptime alias for the ReflectedFn[func] handle type, exposing function introspection through static methods. This is the function-side counterpart to reflect[T] / Reflected[T] for types.

from std.reflection import reflect_fn

def my_func(x: Int) -> Int:
    return x + 1

def main():
    print(reflect_fn[my_func].display_name())   # "my_func"
    print(reflect_fn[my_func].linkage_name())   # mangled symbol name

comptime values​

reflect_fn​

comptime reflect_fn[func_type: AnyType, //, func: func_type] = ReflectedFn[func]

A compile-time alias for the reflection handle type of function func.

Resolves to ReflectedFn[func], a type whose static methods expose function introspection. Use it as reflect_fn[my_func].display_name() rather than constructing an instance.

Example:

from std.reflection import reflect_fn

def add(a: Int, b: Int) -> Int:
    return a + b

def main():
    print(reflect_fn[add].display_name())  # "add"

Parameters​

  • ​func_type (AnyType): The function's type (inferred).
  • ​func (func_type): The function value to introspect.

Structs​

  • ​ReflectedFn: A compile-time reflection handle type for a function value.
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