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Remove Anyhow::Result in system_piping.rs example (#7657)

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# Objective

Fixes: #7610 

## Solution

- Return a specific error type
This commit is contained in:
ZoOL 2023-02-14 03:33:47 +00:00
parent 9dadde06cb
commit 2efc0293ed
1 changed files with 5 additions and 5 deletions
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10
examples/ecs/system_piping.rs
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@ -1,8 +1,8 @@
//! Illustrates how to make a single system from multiple functions running in sequence, //! Illustrates how to make a single system from multiple functions running in sequence,
//! passing the output of the first into the input of the next. //! passing the output of the first into the input of the next.
use anyhow::Result;
use bevy::prelude::*; use bevy::prelude::*;
use std::num::ParseIntError;
use bevy::log::LogPlugin; use bevy::log::LogPlugin;
use bevy::utils::tracing::Level; use bevy::utils::tracing::Level;
@ -31,12 +31,12 @@ struct Message(String);
struct OptionalWarning(Result<(), String>); struct OptionalWarning(Result<(), String>);
// This system produces a Result<usize> output by trying to parse the Message resource. // This system produces a Result<usize> output by trying to parse the Message resource.
fn parse_message_system(message: Res<Message>) -> Result<usize> { fn parse_message_system(message: Res<Message>) -> Result<usize, ParseIntError> {
Ok(message.parse::<usize>()?) message.parse::<usize>()
} }
// This system produces a Result<()> output by trying to parse the Message resource. // This system produces a Result<()> output by trying to parse the Message resource.
fn parse_error_message_system(message: Res<Message>) -> Result<()> { fn parse_error_message_system(message: Res<Message>) -> Result<(), ParseIntError> {
message.parse::<usize>()?; message.parse::<usize>()?;
Ok(()) Ok(())
} }
@ -44,7 +44,7 @@ fn parse_error_message_system(message: Res<Message>) -> Result<()> {
// This system takes a Result<usize> input and either prints the parsed value or the error message // This system takes a Result<usize> input and either prints the parsed value or the error message
// Try changing the Message resource to something that isn't an integer. You should see the error // Try changing the Message resource to something that isn't an integer. You should see the error
// message printed. // message printed.
fn handler_system(In(result): In<Result<usize>>) { fn handler_system(In(result): In<Result<usize, ParseIntError>>) {
match result { match result {
Ok(value) => println!("parsed message: {value}"), Ok(value) => println!("parsed message: {value}"),
Err(err) => println!("encountered an error: {err:?}"), Err(err) => println!("encountered an error: {err:?}"),