Macro structural::FP

macro_rules! FP {
    ($($char:tt)*) => { ... };
}

Constructs a FieldPath(Set) for use as a generic parameter.

Improved macro

To get an improved version of this macro which can use the same syntax as the fp macro,you can do any of:

• Use Rust 1.40 or greater

• Use the nightly_better_macros cargo feature.

• Use the better_macros cargo feature.

Examples

This demonstrates how one can bound types by the accessor traits in a where clause.

use structural::{GetField,GetFieldExt,fp,FP};

fn greet_entity<This,S>(entity:&This)
where
    // From 1.40 onwards you can also write `FP!(name)`.
    //
    // Before 1.40, you can use `field_path_aliases!{ name }` before this function,
    // then write this as `This:GetField<name,Ty=S>`
    This:GetField<FP!(n a m e),Ty=S>,
    S:AsRef<str>,
{
    println!("Hello, {}!",entity.field_(fp!(name)).as_ref() );
}

Example

This demonstrates the improved version of this macro.

use structural::{GetField,GetFieldExt,fp,FP};

fn greet_entity<This,S>(entity:&This)
where
    This:GetField<FP!(name),Ty=S>,
    S:AsRef<str>,
{
    println!("Hello, {}!",entity.field_(fp!(name)).as_ref() );
}

type NumericIdent=FP!(0);
type StringyIdent=FP!(huh);