#[derive(Debug, Clone, Builder, StructOpt)]
//#[builder(build_fn(validate = "Self::validate_parameters"))]
pub struct FileParametres{
#[builder(public)]
pub equation_type:i8,
#[builder(default = "(0 as f32, 1 as f32)")]
pub margin_domain:(f32,f32),
add_args: (Option<TypeTsk>, Option<i8>, Option<bool>)//will be last background_mc additional_correction
}
Please, discribe me anerror and how can avoid it (it will appear if Builder and StructOpt together in use)
the trait bound (f32, f32): std::str::FromStr is not satisfied
the trait std::str::FromStr is not implemented for (f32, f32)
note: required by std::str::FromStr::from_strrustc(E0277)
main.rs(30, 5): the trait std::str::FromStr is not implemented for (f32, f32)
Thanks)
derive_builder crate appears to use FromStr impls to set the "default" values. Tuples (e.g. (f32, f32) in your case) don't implement FromStr, hence the error.
Can you elaborate a bit? If you don't specify the "default" attribute, they're likely using the value's Default impl, which (f32, f32) does have (i.e. (0.0, 0.0)).