Version: 1.0

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]() returning a Reflected[T] handle (use r.name() and r.base_name() for type names)
Function name and linkage introspection (get_function_name, get_linkage_name)
Source location introspection (source_location, call_location)
Deprecated free functions: get_type_name (use reflect[T]().name()) and get_base_type_name (use reflect[T]().base_name())

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 r = reflect[T]()
    comptime names = r.field_names()
    comptime for i in range(r.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.
struct_fields: Deprecated free-function reflection API.
traits: Compile-time meta functions for checking trait conformance across variadic type lists.
type_info: Provides type and function name introspection utilities.

Modules​

Modules