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Helper macro for Morph impls (#11570)

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* Helper macro for Morph impls

* No need to deprecate for now

* Improved macro

* Doc tests

* Grumbles
This commit is contained in:
Gavin Wood
2022-06-01 17:27:47 +01:00
committed by GitHub
parent bb6bbab687
commit 838dbcbe91
5 changed files with 376 additions and 95 deletions
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substrate/frame/support/src/traits/misc.rs
+5 -67
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@@ -21,6 +21,11 @@ use crate::dispatch::Parameter;
use codec::{CompactLen, Decode, DecodeAll, Encode, EncodeLike, Input, MaxEncodedLen};
use scale_info::{build::Fields, meta_type, Path, Type, TypeInfo, TypeParameter};
use sp_arithmetic::traits::{CheckedAdd, CheckedMul, CheckedSub, Saturating};
#[doc(hidden)]
pub use sp_runtime::traits::{
ConstBool, ConstI128, ConstI16, ConstI32, ConstI64, ConstI8, ConstU128, ConstU16, ConstU32,
ConstU64, ConstU8, Get, GetDefault, TypedGet,
};
use sp_runtime::{traits::Block as BlockT, DispatchError};
use sp_std::{cmp::Ordering, prelude::*};
@@ -387,73 +392,6 @@ where
}
}
/// A trait for querying a single value from a type defined in the trait.
///
/// It is not required that the value is constant.
pub trait TypedGet {
/// The type which is returned.
type Type;
/// Return the current value.
fn get() -> Self::Type;
}
/// A trait for querying a single value from a type.
///
/// It is not required that the value is constant.
pub trait Get<T> {
/// Return the current value.
fn get() -> T;
}
impl<T: Default> Get<T> for () {
fn get() -> T {
T::default()
}
}
/// Implement Get by returning Default for any type that implements Default.
pub struct GetDefault;
impl<T: Default> Get<T> for GetDefault {
fn get() -> T {
T::default()
}
}
macro_rules! impl_const_get {
($name:ident, $t:ty) => {
#[derive($crate::RuntimeDebug)]
pub struct $name<const T: $t>;
impl<const T: $t> Get<$t> for $name<T> {
fn get() -> $t {
T
}
}
impl<const T: $t> Get<Option<$t>> for $name<T> {
fn get() -> Option<$t> {
Some(T)
}
}
impl<const T: $t> TypedGet for $name<T> {
type Type = $t;
fn get() -> $t {
T
}
}
};
}
impl_const_get!(ConstBool, bool);
impl_const_get!(ConstU8, u8);
impl_const_get!(ConstU16, u16);
impl_const_get!(ConstU32, u32);
impl_const_get!(ConstU64, u64);
impl_const_get!(ConstU128, u128);
impl_const_get!(ConstI8, i8);
impl_const_get!(ConstI16, i16);
impl_const_get!(ConstI32, i32);
impl_const_get!(ConstI64, i64);
impl_const_get!(ConstI128, i128);
/// A type for which some values make sense to be able to drop without further consideration.
pub trait TryDrop: Sized {
/// Drop an instance cleanly. Only works if its value represents "no-operation".