Version: Nightly

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).

reflection

Compile-time reflection utilities for introspecting Mojo types and functions.

This module provides compile-time reflection capabilities including:

Unified type and struct reflection via reflect[T], a comptime alias for the Reflected[T] handle type. Use reflect[T].name(), reflect[T].base_name(), reflect[T].field_count(), etc.
Function name and linkage introspection (get_function_name, get_linkage_name).
Source location introspection (source_location, call_location).

reflect is auto-imported via the prelude. The other names listed above must be imported explicitly from std.reflection.

Example:

struct Point:
    var x: Int
    var y: Float64

def print_fields[T: AnyType]():
    comptime names = reflect[T].field_names()
    comptime for i in range(reflect[T].field_count()):
        print(names[i])

def main():
    print_fields[Point]()  # Prints: x, y

Modules

location: Implements utilities to capture and represent source code location.
reflect: Provides the unified reflect[T] / Reflected[T] reflection API.
traits: Compile-time meta functions for checking trait conformance across variadic type lists.
type_info: Provides function name introspection utilities.

Modules​

Modules