MRPT  1.9.9
round.h
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1 /* +------------------------------------------------------------------------+
2  | Mobile Robot Programming Toolkit (MRPT) |
3  | https://www.mrpt.org/ |
4  | |
5  | Copyright (c) 2005-2019, Individual contributors, see AUTHORS file |
6  | See: https://www.mrpt.org/Authors - All rights reserved. |
7  | Released under BSD License. See: https://www.mrpt.org/License |
8  +------------------------------------------------------------------------+ */
9 
10 #pragma once
11 
12 #include <mrpt/core/SSE_types.h> // needed by SSE intrinsics used in some inline functions below.
13 #include <mrpt/core/cpu.h>
14 #include <cmath> // pow(), lrint()
15 
16 namespace mrpt
17 {
18 /** \addtogroup mrpt_round Round functions (in #include <mrpt/core/round.h>)
19  * \ingroup mrpt_core_grp
20  * @{ */
21 
22 /** Returns the closer integer (int) to x */
23 template <typename T>
24 inline int round(const T value)
25 {
26 #if MRPT_HAS_SSE2
28  {
29  __m128d t = _mm_set_sd(value);
30  return _mm_cvtsd_si32(t);
31  }
32  else
33 #endif
34  return static_cast<int>(lrint(value));
35 }
36 
37 /** Returns the closer integer (long) to x */
38 template <typename T>
39 inline long round_long(const T value)
40 {
41 #if MRPT_HAS_SSE2 && MRPT_WORD_SIZE == 64
43  {
44  __m128d t = _mm_set_sd(value);
45  return _mm_cvtsd_si64(t);
46  }
47  else
48 #endif
49  return lrint(value);
50 }
51 
52 /** Round a decimal number up to the given 10'th power (eg, to 1000,100,10, and
53  * also fractions)
54  * power10 means round up to: 1 -> 10, 2 -> 100, 3 -> 1000, ... -1 -> 0.1, -2
55  * -> 0.01, ...
56  */
57 template <class T>
58 T round_10power(T val, int power10)
59 {
60  long double F = ::pow((long double)10.0, -(long double)power10);
61  long int t = round_long(val * F);
62  return T(t / F);
63 }
64 
65 /** @} */
66 } // namespace mrpt
GLdouble GLdouble t
Definition: glext.h:3695
long round_long(const T value)
Returns the closer integer (long) to x.
Definition: round.h:39
bool supports(feature f) noexcept
Returns true if CPU (and OS) supports the given CPU feature, and that instruction set or feature was ...
Definition: cpu.h:77
int val
Definition: mrpt_jpeglib.h:957
T round_10power(T val, int power10)
Round a decimal number up to the given 10&#39;th power (eg, to 1000,100,10, and also fractions) power10 m...
Definition: round.h:58
This is the global namespace for all Mobile Robot Programming Toolkit (MRPT) libraries.
GLsizei const GLfloat * value
Definition: glext.h:4134
int round(const T value)
Returns the closer integer (int) to x.
Definition: round.h:24



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