1 | #pragma once |
2 | |
3 | #include <cmath> |
4 | #include <limits> |
5 | #include <type_traits> |
6 | |
7 | |
8 | /// To be sure, that this function is zero-cost for non-floating point types. |
9 | template <typename T> |
10 | inline std::enable_if_t<std::is_floating_point_v<T>, bool> isNaN(T x) |
11 | { |
12 | return std::isnan(x); |
13 | } |
14 | |
15 | template <typename T> |
16 | inline std::enable_if_t<!std::is_floating_point_v<T>, bool> isNaN(T) |
17 | { |
18 | return false; |
19 | } |
20 | |
21 | template <typename T> |
22 | inline std::enable_if_t<std::is_floating_point_v<T>, bool> isFinite(T x) |
23 | { |
24 | return std::isfinite(x); |
25 | } |
26 | |
27 | template <typename T> |
28 | inline std::enable_if_t<!std::is_floating_point_v<T>, bool> isFinite(T) |
29 | { |
30 | return true; |
31 | } |
32 | |
33 | template <typename T> |
34 | std::enable_if_t<std::is_floating_point_v<T>, T> NaNOrZero() |
35 | { |
36 | return std::numeric_limits<T>::quiet_NaN(); |
37 | } |
38 | |
39 | template <typename T> |
40 | std::enable_if_t<std::numeric_limits<T>::is_integer, T> NaNOrZero() |
41 | { |
42 | return 0; |
43 | } |
44 | |
45 | template <typename T> |
46 | std::enable_if_t<std::is_class_v<T>, T> NaNOrZero() |
47 | { |
48 | return T{}; |
49 | } |
50 | |
51 | #if 1 /// __int128 |
52 | template <typename T> |
53 | std::enable_if_t<std::is_same_v<T, __int128> && !std::numeric_limits<T>::is_integer, __int128> NaNOrZero() |
54 | { |
55 | return __int128(0); |
56 | } |
57 | #endif |
58 | |