structural 0.2.2

Abstractions over fields.
Documentation 
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use crate::GetFieldExt;

#[cfg(feature="alloc")]
use crate::pmr::Box;

use core_extensions::{SelfOps,Void};
use core_extensions::type_asserts::AssertEq;


#[cfg(feature="alloc")]
#[test]
fn boxed_fields() {
    let mut f = Box::new((0, 1, Box::new((20, 21)), 3));
    let (f_0, f_1, f_2_0, f_2_1, f_3) = f.fields_mut(fp!(0, 1, 2.0, 2.1, 3));

    *f_0 = 0;
    *f_1 = 0;
    *f_2_0 = 0;
    *f_2_1 = 0;
    *f_3 = 0;

    *f_0 = 5;
    *f_1 = 6;
    *f_2_0 = 7;
    *f_2_1 = 8;
    *f_3 = 9;

    assert_eq!(f.0, 5);
    assert_eq!(f.1, 6);
    assert_eq!((f.2).0, 7);
    assert_eq!((f.2).1, 8);
    assert_eq!(f.3, 9);
}

fn wrap_single<T>(value:T)->(T,){
    (value,) 
}

#[test]
fn deeply_nested(){

    {
        let mut f=make_struct!{
            a:make_struct!{
                aa:(101,103),
                ab:"hello",
            },
            b:false,
        };

        let (f_aa_0,f_aa_1,f_ab,f_b)=f.fields_mut(fp!( a.aa.0, a.aa.1, a.ab, b ));
        assert_eq!(f_aa_0 , &mut 101);
        assert_eq!(f_aa_1, &mut 103);
        assert_eq!(f_ab, &mut "hello");
        *f_aa_0*=3;
        *f_aa_1*=2;
        *f_ab="shoot";
        *f_b=true;
        assert_eq!(f_aa_0 , &mut 303);
        assert_eq!(f_aa_1, &mut 206);
        assert_eq!(f_ab, &mut "shoot");
        assert_eq!(f_b, &mut true);
        
        assert_eq!(f.a.aa.0, 303);
        assert_eq!(f.a.aa.1, 206);
        assert_eq!(f.a.ab, "shoot");
        assert_eq!(f.b, true);
    }

    {
        let mut this=10
            .piped(wrap_single)
            .piped(wrap_single)
            .piped(wrap_single)
            .piped(wrap_single);

        assert_eq!( (((this.0).0).0).0, 10 );
        let num=this.field_mut(fp!(0.0.0.0));
        *num*=2;
        assert_eq!( (((this.0).0).0).0, 20 );
    }


}

#[test]
fn identity_getters(){
    #[cfg(feature="alloc")]
    {
        let mut this=Box::new((0,1));
        let ()=this.fields_mut(fp!());
    }
    /*
    {
        let other=this.field_mut(fp!(()));
        *other=Default::default();
        assert_eq!(this, Default::default());
    }

    {
        let _:FieldPathSet<(),UniquePaths>=
            fp!();

        let _:FieldPath<()>=
            fp!(());

        let _:FieldPathSet<(FieldPath<()>,FieldPath<()>),AliasedPaths>=
            fp!((),());

        let _:FieldPathSet<(FieldPath<()>,FieldPath<()>,FieldPath<()>),AliasedPaths>=
            fp!((),(),());
    }
    */
}



field_path_aliases!{
    FP_0_0=0.0,
    FP_0_1=0.1,
    FP_0_2_0=0.2.0,
    FP_0_2_1=0.2.1,
    FP_0_2_1_0=0.2.1.0,
    FP_0_2_1_1=0.2.1.1,
}

#[test]
fn get_nested_field_types(){
    use crate::{
        GetFieldType,GetFieldType2,GetFieldType3,GetFieldType4,
        RevGetFieldType,
    };


    type FP0=FP!(0);
    type FP1=FP!(1);
    type FP2=FP!(2);

    type Unary<T>=(T,);

    type SStr=&'static str;
    type VVec=&'static [()];

    {
        type Tuple=Unary<SStr>;
        let _:AssertEq<GetFieldType<Tuple,FP0>,SStr>;
    }
    {
        type Tuple=Unary<(Void,SStr)>;
        let _:AssertEq<GetFieldType2<Tuple,FP0,FP0>,Void>;
        let _:AssertEq<GetFieldType2<Tuple,FP0,FP1>,SStr>;

        let _:AssertEq<RevGetFieldType<FP_0_0,Tuple>,Void>;
        let _:AssertEq<RevGetFieldType<FP_0_1,Tuple>,SStr>;
    }
    {
        type Tuple=Unary<((),(),(u64,SStr))>;
        let _:AssertEq<GetFieldType3<Tuple,FP0,FP2,FP0>,u64>;
        let _:AssertEq<GetFieldType3<Tuple,FP0,FP2,FP1>,SStr>;

        let _:AssertEq<RevGetFieldType<FP_0_2_0,Tuple>,u64>;
        let _:AssertEq<RevGetFieldType<FP_0_2_1,Tuple>,SStr>;
    }
    {
        type Tuple=Unary<((),(),((),(SStr,VVec)))>;
        let _:AssertEq<GetFieldType4<Tuple,FP0,FP2,FP1,FP0>,SStr>;
        let _:AssertEq<GetFieldType4<Tuple,FP0,FP2,FP1,FP1>,VVec>;

        let _:AssertEq<RevGetFieldType<FP_0_2_1_0,Tuple>,SStr>;
        let _:AssertEq<RevGetFieldType<FP_0_2_1_1,Tuple>,VVec>;
    }
}