xreflect 0.1.0

Basic macros for dynamic reflection of structs/enums
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138

#![feature(const_type_id)]

use std::any::{Any, TypeId};

use xreflect::{Reflect, ReflectError, StructReflect, StructType};

struct Test<T: 'static> {
	a: i32,
	b: T,
}
impl<N: 'static> Reflect for Test<N> {
	fn amount_of_fields(&self) -> usize {
		2
	}

	fn try_get_index_of_field(&self, field_name: &str) -> Result<usize, ReflectError> {
		match field_name {
			"a" => Ok(0),
			"b" => Ok(1),
			_ => Err(ReflectError::FieldNotFound),
		}
	}

	fn try_get_field_at<T: 'static>(&self, field_index: usize) -> Result<&T, ReflectError> {
		match field_index {
			0 => (&self.a as &dyn Any)
				.downcast_ref::<T>()
				.ok_or(ReflectError::WrongType),
			1 => (&self.b as &dyn Any)
				.downcast_ref::<T>()
				.ok_or(ReflectError::WrongType),
			_ => Err(ReflectError::FieldNotFound),
		}
	}

	fn try_get_field_mut_at<T: 'static>(
		&mut self,
		field_index: usize,
	) -> Result<&mut T, ReflectError> {
		match field_index {
			0 => (&mut self.a as &mut dyn Any)
				.downcast_mut::<T>()
				.ok_or(ReflectError::WrongType),
			1 => (&mut self.b as &mut dyn Any)
				.downcast_mut::<T>()
				.ok_or(ReflectError::WrongType),
			_ => Err(ReflectError::FieldNotFound),
		}
	}

	fn try_get_type_of_field_at(&self, field_index: usize) -> Result<TypeId, ReflectError> {
		match field_index {
			0 => Ok(TypeId::of::<i32>()),
			1 => Ok(TypeId::of::<N>()),
			_ => Err(ReflectError::FieldNotFound),
		}
	}
}
impl<N: 'static> StructReflect for Test<N> {
	const TYPE: StructType =
		StructType::Record(&[("a", TypeId::of::<i32>()), ("b", TypeId::of::<N>())]);
	const FIELD_NAMES: &'static [&'static str] = &["a", "b"];

	fn try_get_index_of_field(field_name: &str) -> Result<usize, ReflectError> {
		match field_name {
			"aaa" => Ok(0),
			"b" => Ok(1),
			_ => Err(ReflectError::FieldNotFound),
		}
	}
}

mod __xreflect_builders0x121839438923924398234898924 {
	use xreflect_core::Builder;

	use crate::Test;

	pub(crate) struct TestBuilder<T> {
		a: Option<i32>,
		b: Option<T>,
	}
	impl<N> Builder<Test<N>> for TestBuilder<N> {
		fn with_field<T: 'static>(mut self, field_name: &'static str, field_value: T) -> Self {
			match field_name {
				"a" => {
					if std::any::TypeId::of::<T>() == std::any::TypeId::of::<i32>() {
						self.a = Some(unsafe { std::mem::transmute_copy::<T, i32>(&field_value) });
					} else {
						panic!("Wrong type")
					}
				}
				"b" => {
					if std::any::TypeId::of::<T>() == std::any::TypeId::of::<N>() {
						self.b = Some(unsafe { std::mem::transmute_copy::<T, N>(&field_value) });
					} else {
						panic!("Wrong type")
					}
				}
				_ => panic!("Field not found"),
			}
			self
		}

		fn with_field_at<T: 'static>(mut self, field_index: usize, field_value: T) -> Self {
			match field_index {
				0 => {
					if std::any::TypeId::of::<T>() == std::any::TypeId::of::<i32>() {
						self.a = Some(unsafe { std::mem::transmute_copy::<T, i32>(&field_value) });
					} else {
						panic!("Wrong type")
					}
				}
				1 => {
					if std::any::TypeId::of::<T>() == std::any::TypeId::of::<N>() {
						self.b = Some(unsafe { std::mem::transmute_copy::<T, N>(&field_value) });
					} else {
						panic!("Wrong type")
					}
				}
				_ => panic!("Field not found"),
			}
			self
		}

		fn try_build(self) -> Result<Test<N>, ()> {
			let Some(a) = self.a else { return Err(()) };
			let Some(b) = self.b else { return Err(()) };
			Ok(Test { a, b })
		}
	}
}
#[test]
fn main() {
	let a = Test { a: 32i32, b: 8u8 };
	let b = a.get_field::<u8>("b");
	dbg!(b);

}