Macro field_of

field_of!() { /* proc-macro */ }

devela_macros Generates an expression for accessing a field of a tuple or struct.

Constructs an expression in the form <value>.<field>, where <value> is a tuple or struct, and <field> is the field to access, either a zero-based index (for tuples) or a named field (for structs).

Example

let my_tuple = (42, 100, 300);
let value = field_of!(my_tuple, 1); // expands to `my_tuple.1`
assert_eq!(value, 100);

struct MyStruct { x: i32, y: i32 }
let my_struct = MyStruct { x: 10, y: 20 };
let value = field_of!(my_struct, y); // expands to `my_struct.y`
assert_eq!(value, 20);