• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2  * Copyright  2019 Google LLC
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     https://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ANDROID_FXLAB_DELAYLINE_H
18 #define ANDROID_FXLAB_DELAYLINE_H
19 
20 #include <vector>
21 
22 
23 template<class T>
24 class DelayLine {
25 public:
DelayLine(std::size_t size)26     DelayLine(std::size_t size): N(size), mArr(N, 0) { }
push(const T & value)27     void push(const T& value) {
28         mArr[mfront++] = value;
29         if (mfront == N) mfront = 0;
30     }
31     // indexed from last value written backwards
32     // i.e T-1 to T-N
33     const T& operator[](int i) {
34         int index = mfront - i;
35         if (index < 0) index += N;
36         return mArr[index];
37     }
38 
39 private:
40     const int N;
41     int mfront = 0;
42     std::vector<T> mArr;
43 };
44 #endif //ANDROID_FXLAB_DELAYLINE_H
45