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
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package vector
export Vector, New;
/*
import vector "vector"
v := vector.New();
v.Insert(0, new(Foo));
v.Append(new(Foo));
v.Delete(0);
for i := 0; i < v.Len(); i++ { f(v.At(i)); }
*/
type Element interface {
}
type Vector struct {
nalloc int;
nelem int;
elem *[]Element;
}
// BUG: workaround for non-constant allocation.
// i must be a power of 10.
func Alloc(i int) *[]Element {
switch i {
case 1:
return new([1]Element);
case 10:
return new([10]Element);
case 100:
return new([100]Element);
case 1000:
return new([1000]Element);
}
print "bad size ", i, "\n";
panic "not known size\n";
}
func is_pow10(i int) bool {
switch i {
case 1, 10, 100, 1000:
return true;
}
return false;
}
func New() *Vector {
v := new(Vector);
v.nelem = 0;
v.nalloc = 1;
v.elem = Alloc(v.nalloc);
return v;
}
func (v *Vector) Len() int {
return v.nelem;
}
func (v *Vector) At(i int) Element {
if i < 0 || i >= v.nelem {
panic "Vector.At(", i, ") out of range (size ", v.nelem, ")\n";
return nil;
}
return v.elem[i];
}
func (v *Vector) Delete(i int) {
if i < 0 || i >= v.nelem {
panic "Delete out of range\n";
}
for j := i+1; j < v.nelem; j++ {
v.elem[j-1] = v.elem[j];
}
v.nelem--;
v.elem[v.nelem] = nil;
}
func (v *Vector) Insert(i int, e Element) {
if i > v.nelem {
panic "Del too large\n";
}
if v.nelem == v.nalloc && is_pow10(v.nalloc) {
n := Alloc(v.nalloc * 10);
for j := 0; j < v.nalloc; j++ {
n[j] = v.elem[j];
}
v.elem = n;
v.nalloc *= 10;
}
// make a hole
for j := v.nelem; j > i; j-- {
v.elem[j] = v.elem[j-1];
}
v.elem[i] = e;
v.nelem++;
}
func (v *Vector) Append(e Element) {
v.Insert(v.nelem, e);
}
/*
type I struct { val int; }; // BUG: can't be local;
func Test() {
i0 := new(I); i0.val = 0;
i1 := new(I); i1.val = 11;
i2 := new(I); i2.val = 222;
i3 := new(I); i3.val = 3333;
i4 := new(I); i4.val = 44444;
v := New();
print "hi\n";
v.Insert(0, i4);
v.Insert(0, i3);
v.Insert(0, i2);
v.Insert(0, i1);
v.Insert(0, i0);
for i := 0; i < v.Len(); i++ {
print i, " ", v.At(i).(*I).val, "\n";
}
}
export Test;
*/
|
