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use prelude::*; use crate_::ops::{FoldL_, Map_}; use crate_::fn_adaptors::ApplyNth; ///////////////////////////////////////////////////////////////////////////////////////// /// Gets the value of the fields of a ConstValue. pub trait GetField_<Field>: Sized { /// The type of the field. type Output; /// Returns the ConstValue field. fn get_field() -> Self::Output where Self::Output: MarkerType, { MarkerType::markertype_val() } /// Returns the ConstValue field by reference. fn get_field_ref<'a>() -> &'a Self::Output where Self::Output: MarkerType + 'a, { MarkerType::markertype_ref() } /// Returns the ConstValue field. fn field(self) -> Self::Output where Self::Output: MarkerType, { MarkerType::markertype_val() } /// Returns the ConstValue field by reference. fn field_ref<'a>(self) -> &'a Self::Output where Self::Output: MarkerType + 'a, { MarkerType::markertype_ref() } } /// Gets the runtime value of a field of a ConstValue. pub trait GetFieldRuntime_<Field, RuntimeType>: GetField_<Field> { /// The type of the runtime equivalent of `Field`. type Runtime; /// Returns the runtime value of the field. fn get_val() -> Self::Runtime where GetField<Self, Field>: IntoRuntime<Self::Runtime>, { Self::Output::to_runtime() } /// Returns a VariantPhantom wrapping the type of the runtime equivalent of `Field`. fn runtime_field_ty( self, _: Field, _: VariantPhantom<RuntimeType>, ) -> VariantPhantom<Self::Runtime> { PhantomData } } ////////////////////////////////////////////////////////////////////////////////////////// type_fn!{ /// Equivalent to `|Struct,Field| Struct[Field] `. alias GetFieldOp[This,Field]=GetField_ } /// Returns the compile-time value of a field. pub type GetField<This, FieldName> = <This as GetField_<FieldName>>::Output; /// Returns the runtime type of a field. pub type GetFieldRuntime<This, FieldName, RuntimeTy> = <This as GetFieldRuntime_<FieldName, RuntimeTy>>::Runtime; ////////////////////////////////////////////////////////////////////////////////////////// /// Allows setting a field of a type-level struct. pub trait SetField_<Field, Value: ?Sized>: Sized { type Output; } /// Changes the compile-time value of a field,returning a new struct. pub type SetField<This, FieldName, Value> = <This as SetField_<FieldName, Value>>::Output; type_fn!{ /// Equivalent to `|Struct,Field,Value|{ Struct[Field]=Value; Struct }`. alias SetFieldOp[This,Field,Value]=SetField_ } /** Sets the fields of Self with the `FVPairs` list of (FieldAccessor,Value) pairs. `FVPairs` example:tlist![ (field::x,U10), (field::y,U5) ] . # Example This example uses the `generic type as type alias` pattern. ``` # #[macro_use] # extern crate derive_type_level; # #[macro_use] # extern crate type_level_values; # use type_level_values::prelude::*; use type_level_values::field_traits::{SetField,SetFields_}; #[derive(TypeLevel)] #[typelevel(reexport(Struct))] pub struct Rectangle{ pub x:u32, pub y:u32, pub w:u32, pub h:u32, } use self::type_level_Rectangle::fields; type InitialRectangle=SetField< Rectangle_Uninit, fields::All, U50 >; fn reset_width_height<Rect,__RectOut>(_:Rect)->__RectOut where Rect:SetFields_<tlist![ (fields::w, U0 ), (fields::h, U0 ), ],Output=__RectOut>, __RectOut:ConstValue, { __RectOut::MTVAL } fn main(){ let initial:ConstRectangle<U50,U50,U50,U50>= InitialRectangle::MTVAL; let _=reset_width_height(initial) ; let _:ConstRectangle<U50,U50,U0,U0>= reset_width_height(initial) ; } ``` */ pub trait SetFields_<FVPairs>{ type Output; } impl<This,FVPairs,Out> SetFields_<FVPairs> for This where FVPairs:FoldL_<This,SetFieldValuePair,Output=Out> { type Output=Out; } /// Sets the values of fields in This initializing all the fields with FVPairs. /// /// `FVPairs` example:tlist![ (field::x,U10), (field::y,U5) ] . pub type SetFields<This, FVPairs> = <This as SetFields_<FVPairs>>::Output; ////////////////////////////////////////////////////////////////////////////////////////// /// Set all the fields mentioned in the `Fields` list to the `Value` value . pub type SetFieldsTo<Struct, Fields, Value> = TypeFn<SetFieldsToOp<Value>, (Struct, Fields)>; type_fn!{ captures(Value) /// Set all the fields mentioned in the `Fields` list to the `Value` value . pub fn SetFieldsToOp[Struct,Fields](Struct,Fields) where[ Fields:FoldL_< Struct ,ApplyNth<SetFieldOp,U2,Value>> ]{ Fields::Output } } type_fn!{ /// Sets the fields of Struc with the `FVPairs` list of (FieldAccessor,Value) pairs. pub fn SetFieldsOp[Struc,FVPairs](Struc,FVPairs) where [ FVPairs:FoldL_<Struc,SetFieldValuePair,Output=Out> ] { let Out;Out } } type_fn!{ /// Type-level equivalent of `|Struc,(Field,Value)|{ Struc[Field]=Value; Struc }` pub fn SetFieldValuePair[Struc,Field,Value](Struc,(Field,Value)) where [ Struc:SetField_<Field,Value,Output=Out> ] { let Out;Out } } ////////////////////////////////////////////////////////////////////////////////////////// /// Type-level equivalent of "|This, Field, Mapper|{ This[Field]=Mapper(This[Field]); This }". pub type MapField<This, Field, Mapper> = TypeFn<MapFieldOp, (This, Field, Mapper)>; type_fn!{ /// Type-level equivalent of "|This, Field, Mapper|{ This[Field]=Mapper(This[Field]); This }". pub fn MapFieldOp[This, Field, Mapper](This, Field, Mapper) where[ This: GetField_<Field, Output = Res0>, Mapper: TypeFn_<Res0, Output = NewValue>, This: SetField_<Field, NewValue, Output = Res2>, ]{ let Res0;let NewValue;let Res2; Res2 } } ///////////////////////////////////////////////////////////////////////////////////////////// /// Type-level equivalent of "|This, Field, Mapper|{ This[Field]=Mapper(This); This }". pub type MapIntoField<This, Field, Mapper> = TypeFn<MapIntoFieldOp, (This, Field, Mapper)>; type_fn!{ /// Type-level equivalent of "|This, Field, Mapper|{ This[Field]=Mapper(This); This }". pub fn MapIntoFieldOp[This, Field, Mapper](This, Field, Mapper) where[ Mapper: TypeFn_<This, Output = NewValue>, This: SetField_<Field, NewValue,Output=Out>, ]{ let NewValue;let Out; Out } } ////////////////////////////////////////////////////////////////////////////////////////// /// Trait for field accessors. pub trait Field_ { /// What type this field is stored inside of. type Inside: ConstType; } ////////////////////////////////////////////////////////////////////////////////////////// /** Macro for setting the fields of a compile-time struct. When constructing a ConstValue prefer using the construct macro instead to ensure that all fields are initialized. # Example ``` # #[macro_use] # extern crate derive_type_level; # #[macro_use] # extern crate type_level_values; # use type_level_values::prelude::*; # use type_level_values::field_traits::SetField; #[derive(TypeLevel)] #[typelevel(reexport(Struct))] pub struct Rectangle{ pub x:u32, pub y:u32, pub w:u32, pub h:u32, } use self::type_level_Rectangle::fields; type InitialRectangle=SetField< Rectangle_Uninit, fields::All, U0 >; type MovedRectangle=set_fields!{InitialRectangle=> fields::w=U10, fields::h=U5, }; fn main(){ let _:ConstRectangle<U0,U0,U0,U0>=InitialRectangle::MTVAL; let _:ConstRectangle<U0,U0,U10,U5>=MovedRectangle::MTVAL; } ``` */ #[macro_export] macro_rules! set_fields { ()=>{}; ($this:ty) => { $this }; ($this:ty => $($field_name:ty=$field_val:ty),* $(,)* ) => { <$this as $crate::field_traits::SetFields_< tlist![ $( ($field_name,$field_val) ),* ] > >::Output }; }