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1 | // Copyright (c) 1998-1999 Matra Datavision |
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2 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
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3 | // |
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4 | // This file is part of Open CASCADE Technology software library. |
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5 | // |
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6 | // This library is free software; you can redistribute it and/or modify it under |
7 | // the terms of the GNU Lesser General Public License version 2.1 as published |
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8 | // by the Free Software Foundation, with special exception defined in the file |
9 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
10 | // distribution for complete text of the license and disclaimer of any warranty. |
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11 | // |
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12 | // Alternatively, this file may be used under the terms of Open CASCADE |
13 | // commercial license or contractual agreement. |
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14 | |
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15 | #include <Standard_math.hxx> |
16 | |
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17 | // MSVC versions prior to 12 did not provided acosh, asinh, atanh functions in standard library |
18 | #if defined(_MSC_VER) && (_MSC_VER < 1800) |
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19 | |
20 | Standard_EXPORT double __cdecl acosh( double X) |
21 | { |
22 | double res; |
23 | res = log(X + sqrt(X * X - 1)); |
24 | return res; |
25 | }; |
26 | Standard_EXPORT double __cdecl asinh( double X) |
27 | { |
28 | double res; |
29 | // Modified by Sergey KHROMOV - Mon Nov 11 16:27:11 2002 Begin |
30 | // Correction of the formula to avoid numerical problems. |
31 | // res = log(X + sqrt(X * X + 1)); |
32 | if (X > 0.) |
33 | res = log(X + sqrt(X * X + 1)); |
34 | else |
35 | res = -log(sqrt(X * X + 1) - X); |
36 | // Modified by Sergey KHROMOV - Mon Nov 11 16:27:13 2002 End |
37 | return res; |
38 | }; |
39 | Standard_EXPORT double __cdecl atanh( double X) |
40 | { |
41 | double res; |
42 | res = log((1 + X) / (1 - X)) / 2; |
43 | return res; |
44 | }; |
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45 | |
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46 | #endif |