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|
macro_rules! try_option {
($expr: expr) => {
match $expr {
Ok(value) => value,
Err(err) => {
return Some(Err(err.into()));
}
}
};
}
use std::mem::ManuallyDrop;
use std::ops::{Deref, DerefMut};
pub(crate) use try_option;
macro_rules! or {
(($($tt: tt)+) else ($($else_tt: tt)*)) => {
$($tt)+
};
(() else ($($else_tt: tt)*)) => {
$($else_tt)*
};
}
pub(crate) use or;
macro_rules! builder {
(
$(#[doc = $doc: literal])*
#[builder(
name = $builder_name: ident
$(, derives = ($($builder_derive: ident),+))?
)]
$(#[$attr: meta])*
$visibility: vis struct $name: ident
{
$(
$(#[$field_attr: meta])*
$field_visibility: vis $field: ident: $field_type: ty,
)*
}
) => {
$(#[doc = $doc])*
$(#[$attr])*
$visibility struct $name
{
$(
$(#[$field_attr])*
$field_visibility $field: $field_type,
)*
}
$(#[derive($($builder_derive),+)])?
$visibility struct $builder_name
{
$(
$field: $field_type,
)*
}
impl $builder_name
{
$(
#[must_use]
$visibility fn $field(mut self, $field: $field_type) -> Self
{
self.$field = $field;
self
}
)*
#[must_use]
$visibility fn build(self) -> $name {
$name {
$(
$field: self.$field,
)*
}
}
}
impl From<$name> for $builder_name
{
fn from(built: $name) -> Self
{
Self {
$(
$field: built.$field,
)*
}
}
}
};
}
pub(crate) use builder;
/// Wrapper that ensures the contained value will never be dropped.
#[derive(Debug)]
pub struct NeverDrop<Value>
{
value: ManuallyDrop<Value>,
}
impl<Value> NeverDrop<Value>
{
#[must_use]
pub fn new(value: Value) -> Self
{
Self { value: ManuallyDrop::new(value) }
}
}
impl<Value> Deref for NeverDrop<Value>
{
type Target = Value;
fn deref(&self) -> &Self::Target
{
&*self.value
}
}
impl<Value> DerefMut for NeverDrop<Value>
{
fn deref_mut(&mut self) -> &mut Self::Target
{
&mut *self.value
}
}
|
