1 /**
2    Copyright (c) 2016 Mariano Gonzalez
3 
4    Permission is hereby granted, free of charge, to any person obtaining a copy
5    of this software and associated documentation files (the "Software"), to deal
6    in the Software without restriction, including without limitation the rights
7    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    copies of the Software, and to permit persons to whom the Software is
9    furnished to do so, subject to the following conditions:
10 
11    The above copyright notice and this permission notice shall be included in all
12    copies or substantial portions of the Software.
13 
14    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20    SOFTWARE.
21 */
22 
23 #ifndef spp_timer_h_guard
24 #define spp_timer_h_guard
25 
26 #include <chrono>
27 
28 namespace spp
29 {
30     template<typename time_unit = std::milli>
31     class Timer
32     {
33     public:
Timer()34         Timer()                 { reset(); }
reset()35         void reset()            { _start = _snap = clock::now();  }
snap()36         void snap()             { _snap = clock::now();  }
37 
get_total()38         float get_total() const { return get_diff<float>(_start, clock::now()); }
get_delta()39         float get_delta() const { return get_diff<float>(_snap, clock::now());  }
40 
41     private:
42         using clock = std::chrono::high_resolution_clock;
43         using point = std::chrono::time_point<clock>;
44 
45         template<typename T>
get_diff(const point & start,const point & end)46         static T get_diff(const point& start, const point& end)
47         {
48             using duration_t = std::chrono::duration<T, time_unit>;
49 
50             return std::chrono::duration_cast<duration_t>(end - start).count();
51         }
52 
53         point _start;
54         point _snap;
55     };
56 }
57 
58 #endif // spp_timer_h_guard
59