Embedded Template Library 1.0
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sqrt.h
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1
2
3/******************************************************************************
4The MIT License(MIT)
5
6Embedded Template Library.
7https://github.com/ETLCPP/etl
8https://www.etlcpp.com
9
10Copyright(c) 2017 John Wellbelove
11
12Permission is hereby granted, free of charge, to any person obtaining a copy
13of this software and associated documentation files(the "Software"), to deal
14in the Software without restriction, including without limitation the rights
15to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
16copies of the Software, and to permit persons to whom the Software is
17furnished to do so, subject to the following conditions :
18
19The above copyright notice and this permission notice shall be included in all
20copies or substantial portions of the Software.
21
22THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
25AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
26LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
27OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
28SOFTWARE.
29******************************************************************************/
30
31#ifndef ETL_SQRT_INCLUDED
32#define ETL_SQRT_INCLUDED
33
34#include "platform.h"
35#include "type_traits.h"
36#include "constant.h"
37
38#include <stddef.h>
39
40namespace etl
41{
42 //***************************************************************************
44 //***************************************************************************
45 template <size_t VALUE, size_t I = 1>
46 struct sqrt
47 {
48 typedef typename etl::conditional<((I * I) > VALUE),
51
52#if ETL_USING_CPP11
53 static constexpr size_t value = type::value;
54#else
55 enum
56 {
57 // Recursive definition.
58 value = type::value
59 };
60#endif
61 };
62
63#if ETL_USING_CPP11
64 template <size_t VALUE, size_t I>
65 constexpr size_t sqrt<VALUE, I>::value;
66#endif
67
68#if ETL_USING_CPP17
69 template <size_t VALUE, size_t I = 1>
70 inline constexpr size_t sqrt_v = sqrt<VALUE, I>::value;
71#endif
72}
73
74#endif
Definition constant.h:45
conditional
Definition type_traits_generator.h:1160
bitset_ext
Definition absolute.h:38
pair holds two objects of arbitrary type
Definition utility.h:164
Calculates the smallest value that, when squared, will be not greater than VALUE.
Definition sqrt.h:47