Rust 选择性 model 库

Question

how can i have crate that depend on with feature use another version of same crate like below

[features]
serde_1 = ["dep_serde_1"]
serde_1_0_133 = ["dep_serde_1_0_133"]

[dependencies]
dep_serde_1 = { package = "serde", version = "1.0.0", optional = true}
dep_serde_1_0_133 = { package = "serde", version = "1.0.133", optional = true}

my problem is compiler force me to use

use dep_serde_1::*;

except like this

use serde::*;

i just enable one of them at time and in code with cfg(feature = serde_1) i'll chose what code must compile

sorry about my poor English

[Edit]

main idea drive form this problem, for example if my model use actix-0.10 and another crate that use my lib use actix-0.12 it generate compiler error

Answer 1

I'm not quite sure I understand what you want. If you want the name of the crate to be serde in your use statements, you can rename them back:

#[cfg(feature = "dep_serde_1")]
extern crate dep_serde_1 as serde;
#[cfg(feature = "dep_serde_1_0_133")]
extern crate dep_serde_1_0_133 as serde;

// Now you can
use serde::*;

Note, by the way, that mutually exclusive features are not a good idea . If you can, it's better to make one the default and the other to override it.