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4cff3ded AW |
1 | /* |
2 | This file is part of Smoothie (http://smoothieware.org/). The motion control part is heavily based on Grbl (https://github.com/simen/grbl). | |
3 | Smoothie is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. | |
4 | Smoothie is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. | |
5 | You should have received a copy of the GNU General Public License along with Smoothie. If not, see <http://www.gnu.org/licenses/>. | |
6 | ||
7 | With chucks taken from http://en.wikipedia.org/wiki/Circular_buffer, see licence there also | |
8 | */ | |
9 | ||
10 | #ifndef RINGBUFFER_H | |
11 | #define RINGBUFFER_H | |
12 | ||
13 | ||
14 | template<class kind, int length> class RingBuffer { | |
15 | public: | |
16 | RingBuffer(); | |
17 | int size(); | |
18 | int capacity(); | |
19 | void push_back(kind object); | |
20 | void pop_front(kind &object); | |
21 | void get( int index, kind &object); | |
22 | kind* get_ref( int index); | |
23 | void delete_first(); | |
24 | ||
25 | kind buffer[length]; | |
26 | int head; | |
27 | int tail; | |
28 | }; | |
29 | ||
30 | ||
31 | template<class kind, int length> RingBuffer<kind, length>::RingBuffer(){ | |
32 | this->head = this->tail = 0; | |
33 | } | |
34 | ||
35 | template<class kind, int length> int RingBuffer<kind, length>::capacity(){ | |
36 | return length-1; | |
37 | } | |
38 | ||
39 | template<class kind, int length> int RingBuffer<kind, length>::size(){ | |
40 | return((this->head>this->tail)?length:0)+this->tail-head; | |
41 | } | |
42 | ||
43 | template<class kind, int length> void RingBuffer<kind, length>::push_back(kind object){ | |
44 | this->buffer[this->tail] = object; | |
45 | this->tail = (tail+1)&(length-1); | |
46 | } | |
47 | ||
48 | template<class kind, int length> void RingBuffer<kind, length>::get(int index, kind &object){ | |
49 | int j= 0; | |
50 | int k= this->head; | |
51 | while (k != this->tail){ | |
52 | if (j == index) break; | |
53 | j++; | |
54 | k= (k + 1) & (length - 1); | |
55 | } | |
56 | if (k == this->tail){ | |
57 | //return NULL; | |
58 | } | |
59 | object = this->buffer[k]; | |
60 | } | |
61 | ||
62 | ||
63 | template<class kind, int length> kind* RingBuffer<kind, length>::get_ref(int index){ | |
64 | int j= 0; | |
65 | int k= this->head; | |
66 | while (k != this->tail){ | |
67 | if (j == index) break; | |
68 | j++; | |
69 | k= (k + 1) & (length - 1); | |
70 | } | |
71 | if (k == this->tail){ | |
72 | return NULL; | |
73 | } | |
74 | return &(this->buffer[k]); | |
75 | } | |
76 | ||
77 | template<class kind, int length> void RingBuffer<kind, length>::pop_front(kind &object){ | |
78 | object = this->buffer[this->head]; | |
79 | this->head = (this->head+1)&(length-1); | |
80 | } | |
81 | ||
82 | template<class kind, int length> void RingBuffer<kind, length>::delete_first(){ | |
83 | kind dummy; | |
84 | this->pop_front(dummy); | |
85 | } | |
86 | ||
87 | ||
88 | #endif |