Debug Helper
This crate provides declarative macros to help you implement the Debug
trait manually.
Examples
For structs,
#[macro_use] extern crate debug_helper;
use std::fmt::{self, Formatter, Debug};
pub struct A {
pub f1: u8,
pub f2: i16,
pub f3: f64,
}
impl Debug for A {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> {
impl_debug_for_struct!(A, f, self, .f1, (.f3, "{:.3}", self.f3));
}
}
let a = A {
f1: 1,
f2: 2,
f3: std::f64::consts::PI,
};
println!("{:#?}", a);
For tuple structs,
#[macro_use] extern crate debug_helper;
use std::fmt::{self, Formatter, Debug};
pub struct A(pub u8, pub i16, pub f64);
impl Debug for A {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> {
impl_debug_for_tuple_struct!(A, f, self, .0, (.2, "{:.3}", self.2));
}
}
let a = A(1, 2, std::f64::consts::PI);
println!("{:#?}", a);
For enums,
#[macro_use] extern crate debug_helper;
use std::fmt::{self, Formatter, Debug};
pub enum A {
V1,
V2(u8, i16, f64),
V3 {
f1: u8,
f2: i16,
f3: f64,
},
}
impl Debug for A {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> {
impl_debug_for_enum!(A::{V1, (V2(f1, _, f3): (.f1, (.f3, "{:.3}", f3))), {V3{f1, f2: _, f3}: (.f1, (.f3, "{:.3}", f3))}}, f, self);
}
}
let a = A::V1;
let b = A::V2(1, 2, std::f64::consts::PI);
let c = A::V3{
f1: 1,
f2: 2,
f3: std::f64::consts::PI,
};
println!("{:#?}", a);
println!("{:#?}", b);
println!("{:#?}", c);
In most cases, you can use the derivative
crate to implement the Debug
trait.
Crates.io
https://crates.io/crates/debug-helper
Documentation
https://docs.rs/debug-helper
License
MIT