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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191

use crate::core::*;
use crate::Result;
use std::ops::*;

pub enum MatExprResult<T> {
	Ok(T),
	Err(crate::Error),
}

impl<T> From<Result<T, crate::Error>> for MatExprResult<T> {
	fn from(r: Result<T, crate::Error>) -> Self {
		match r {
			Result::Ok(val) => MatExprResult::Ok(val),
			Result::Err(e) => MatExprResult::Err(e),
		}
	}
}

impl<T> MatExprResult<T> {
	pub fn into_result(self) -> Result<T, crate::Error> {
		match self {
			MatExprResult::Ok(val) => std::result::Result::Ok(val),
			MatExprResult::Err(e) => std::result::Result::Err(e),
		}
	}
}

/// elementwise multiplication
pub trait ElemMul<Rhs = Self> {
	type Output;
	fn elem_mul(self, rhs: Rhs) -> Self::Output;
}

// only for internal usage
trait ToUnderlyingArg<'a, T: 'a> {
	fn to_underlying_arg(&'a self) -> T;
}
impl<'a> ToUnderlyingArg<'a, &'a Mat> for Mat {
	fn to_underlying_arg(&'a self) -> &'a Mat {
		self
	}
}
impl<'a> ToUnderlyingArg<'a, &'a MatExpr> for MatExpr {
	fn to_underlying_arg(&'a self) -> &'a MatExpr {
		self
	}
}
impl<'a> ToUnderlyingArg<'a, Scalar> for Scalar {
	fn to_underlying_arg(&'a self) -> Scalar {
		*self
	}
}
impl<'a> ToUnderlyingArg<'a, f64> for f64 {
	fn to_underlying_arg(&'a self) -> f64 {
		*self
	}
}

macro_rules! impl_ops_core {
	($func_name:ident, $op_type:ident, $lhs_type:ty, $rhs_type:ty, $op_func:ident) => {
		// Lhs op Rhs
		impl $op_type<$rhs_type> for $lhs_type {
			type Output = MatExprResult<MatExpr>;

			fn $op_func(self, rhs: $rhs_type) -> Self::Output {
				let lhs = self;
				$func_name(lhs.to_underlying_arg(), rhs.to_underlying_arg()).into()
			}
		}

		// MatExprResult<Lhs> op Rhs
		impl $op_type<$rhs_type> for MatExprResult<$lhs_type> {
			type Output = MatExprResult<MatExpr>;

			fn $op_func(self, rhs: $rhs_type) -> Self::Output {
				let lhs = self;
				match lhs {
					MatExprResult::Ok(lhs) => $func_name(lhs.to_underlying_arg(), rhs.to_underlying_arg()).into(),
					MatExprResult::Err(e) => MatExprResult::Err(e),
				}
			}
		}

		// Lhs op MatExprResult<Rhs>
		impl $op_type<MatExprResult<$rhs_type>> for $lhs_type {
			type Output = MatExprResult<MatExpr>;

			fn $op_func(self, rhs: MatExprResult<$rhs_type>) -> Self::Output {
				let lhs = self;
				match rhs {
					MatExprResult::Ok(rhs) => $func_name(lhs.to_underlying_arg(), rhs.to_underlying_arg()).into(),
					MatExprResult::Err(e) => MatExprResult::Err(e),
				}
			}
		}

		// MatExprResult<Lhs> op MatExprResult<Rhs>
		impl $op_type<MatExprResult<$rhs_type>> for MatExprResult<$lhs_type> {
			type Output = MatExprResult<MatExpr>;

			fn $op_func(self, rhs: MatExprResult<$rhs_type>) -> Self::Output {
				let lhs = self;
				match (lhs, rhs) {
					(MatExprResult::Ok(lhs), MatExprResult::Ok(rhs)) => {
						$func_name(lhs.to_underlying_arg(), rhs.to_underlying_arg()).into()
					}
					(MatExprResult::Err(e), MatExprResult::Ok(_)) => MatExprResult::Err(e),
					(MatExprResult::Ok(_), MatExprResult::Err(e)) => MatExprResult::Err(e),
					(MatExprResult::Err(lhs_e), MatExprResult::Err(rhs_e)) => MatExprResult::Err(crate::Error::new(
						0,
						format!(
							"Both side of operator has error: lhs-error={} rhs-error={}",
							lhs_e, rhs_e
						),
					)),
				}
			}
		}
	};
}

macro_rules! impl_ops {
	($func_name:ident, $op_type:ident, $lhs_type:ty, $rhs_type:ty, $op_func:ident) => {
		impl_ops_core!($func_name, $op_type, $lhs_type, $rhs_type, $op_func);
		impl_ops_core!($func_name, $op_type, $lhs_type, &$rhs_type, $op_func);
		impl_ops_core!($func_name, $op_type, &$lhs_type, $rhs_type, $op_func);
		impl_ops_core!($func_name, $op_type, &$lhs_type, &$rhs_type, $op_func);
	};
}

impl_ops!(add_mat_mat, Add, Mat, Mat, add);
impl_ops!(add_mat_matexpr, Add, Mat, MatExpr, add);
impl_ops!(add_matexpr_mat, Add, MatExpr, Mat, add);
impl_ops!(add_matexpr_matexpr, Add, MatExpr, MatExpr, add);

impl_ops!(add_mat_scalar, Add, Mat, Scalar, add);
impl_ops!(add_matexpr_scalar, Add, MatExpr, Scalar, add);
impl_ops!(add_scalar_mat, Add, Scalar, Mat, add);
impl_ops!(add_scalar_matexpr, Add, Scalar, MatExpr, add);

impl_ops!(sub_mat_mat, Sub, Mat, Mat, sub);
impl_ops!(sub_mat_matexpr, Sub, Mat, MatExpr, sub);
impl_ops!(sub_matexpr_mat, Sub, MatExpr, Mat, sub);
impl_ops!(sub_matexpr_matexpr, Sub, MatExpr, MatExpr, sub);

impl_ops!(sub_mat_scalar, Sub, Mat, Scalar, sub);
impl_ops!(sub_matexpr_scalar, Sub, MatExpr, Scalar, sub);
impl_ops!(sub_scalar_mat, Sub, Scalar, Mat, sub);
impl_ops!(sub_scalar_matexpr, Sub, Scalar, MatExpr, sub);

impl_ops!(mul_mat_mat, Mul, Mat, Mat, mul);
impl_ops!(mul_mat_matexpr, Mul, Mat, MatExpr, mul);
impl_ops!(mul_matexpr_mat, Mul, MatExpr, Mat, mul);
impl_ops!(mul_matexpr_matexpr, Mul, MatExpr, MatExpr, mul);

impl_ops!(mul_mat_f64, Mul, Mat, f64, mul);
impl_ops!(mul_matexpr_f64, Mul, MatExpr, f64, mul);
impl_ops!(mul_f64_mat, Mul, f64, Mat, mul);
impl_ops!(mul_f64_matexpr, Mul, f64, MatExpr, mul);

impl_ops!(div_mat_mat, Div, Mat, Mat, div);
impl_ops!(div_mat_matexpr, Div, Mat, MatExpr, div);
impl_ops!(div_matexpr_mat, Div, MatExpr, Mat, div);
impl_ops!(div_matexpr_matexpr, Div, MatExpr, MatExpr, div);

impl_ops!(div_mat_f64, Div, Mat, f64, div);
impl_ops!(div_matexpr_f64, Div, MatExpr, f64, div);
impl_ops!(div_f64_mat, Div, f64, Mat, div);
impl_ops!(div_f64_matexpr, Div, f64, MatExpr, div);

fn elemmul_mat_mat(a: &Mat, b: &Mat) -> Result<MatExpr> {
	MatTraitConst::mul(a, b, 1.0)
}
fn elemmul_mat_matexpr(a: &Mat, b: &MatExpr) -> Result<MatExpr> {
	MatTraitConst::mul(a, b, 1.0)
}
fn elemmul_matexpr_mat(a: &MatExpr, b: &Mat) -> Result<MatExpr> {
	MatExprTraitConst::mul(a, b, 1.0)
}
fn elemmul_matexpr_matexpr(a: &MatExpr, b: &MatExpr) -> Result<MatExpr> {
	MatExprTraitConst::mul_matexpr(a, b, 1.0)
}

impl_ops!(elemmul_mat_mat, ElemMul, Mat, Mat, elem_mul);
impl_ops!(elemmul_mat_matexpr, ElemMul, Mat, MatExpr, elem_mul);
impl_ops!(elemmul_matexpr_mat, ElemMul, MatExpr, Mat, elem_mul);
impl_ops!(elemmul_matexpr_matexpr, ElemMul, MatExpr, MatExpr, elem_mul);

// not implemented yet, but can use `0 - mat`
// fn sub_mat(Mat);
// fn sub_matexpr(MatExpr);