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

use std::fmt;

use traits::{MatrixRawGet, MatrixRawSet, MatrixShape, MatrixHStack, SameShape};
use matrix::write_mat;

impl<L: MatrixShape,
     R: MatrixShape>
MatrixHStack<R> for
L
{
	unsafe fn unsafe_hstack(self, right: R) -> HStack<L, R>
	{
		HStack::unsafe_new(self, right)
	}

	fn hstack(self, right: R) -> HStack<L, R>
	{
		HStack::new(self, right)
	}
}

#[derive(Copy)]
pub struct HStack<L, R>
{
	left: L,
	right: R,
}

impl<L: MatrixShape,
     R: MatrixShape>
HStack<L, R>
{
	unsafe fn unsafe_new(left: L, right: R) -> HStack<L, R>
	{
		HStack{ left: left, right: right }
	}

	fn new(left: L, right: R) -> HStack<L, R>
	{
		assert_eq!(left.nrow(), right.nrow());
		HStack{ left: left, right: right }
	}
}

impl<L: MatrixRawGet + MatrixShape,
     R: MatrixRawGet>
MatrixRawGet for
HStack<L, R>
{
	unsafe fn raw_get(&self, r: usize, c: usize) -> f64
	{
		if c < self.left.ncol()
		{
			self.left.raw_get(r, c)
		}
		else
		{
			self.right.raw_get(r, c - self.left.ncol())
		}
	}
}

impl<L: MatrixRawSet + MatrixShape,
     R: MatrixRawSet>
MatrixRawSet for
HStack<L, R>
{
	unsafe fn raw_set(&self, r: usize, c: usize, val: f64)
	{
		if c < self.left.ncol()
		{
			self.left.raw_set(r, c, val)
		}
		else
		{
			self.right.raw_set(r, c - self.left.ncol(), val)
		}
	}
}

impl<L: MatrixShape,
     R: MatrixShape>
MatrixShape for
HStack<L, R>
{
	fn nrow(&self) -> usize
	{
		self.left.nrow()
	}

	fn ncol(&self) -> usize
	{
		self.left.ncol() + self.right.ncol()
	}
}

impl<L: MatrixShape,
     R: MatrixShape>
SameShape for
HStack<L, R>
{
	fn same_shape(&self, nrow: usize, ncol: usize) -> bool
	{
		self.nrow() == nrow && self.ncol() == ncol
	}
}

impl<L: Clone,
     R: Clone>
Clone for
HStack<L, R>
{
	fn clone(&self) -> HStack<L, R>
	{
		HStack{ left: self.left.clone(), right: self.right.clone() }
	}
}

impl<L: MatrixRawGet + MatrixShape,
     R: MatrixRawGet + MatrixShape>
fmt::Display for
HStack<L, R>
{
	fn fmt(&self, buf: &mut fmt::Formatter) -> fmt::Result
	{
		write_mat(buf, self)
	}
}