Thrill  0.1
sgn.hpp
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1 /*******************************************************************************
2  * tlx/math/sgn.hpp
3  *
4  * sgn() return the signum (-1, 0, +1) of a value.
5  *
6  * Part of tlx - http://panthema.net/tlx
7  *
8  * Copyright (C) 2018 Timo Bingmann <[email protected]>
9  *
10  * All rights reserved. Published under the Boost Software License, Version 1.0
11  ******************************************************************************/
12 
13 #ifndef TLX_MATH_SGN_HEADER
14 #define TLX_MATH_SGN_HEADER
15 
16 namespace tlx {
17 
18 //! \addtogroup tlx_math
19 //! \{
20 
21 /******************************************************************************/
22 //! sgn() - signum
23 
24 //! return the signum (-1, 0, +1) of a value.
25 template <typename T>
26 int sgn(const T& val) {
27  // from https://stackoverflow.com/questions/1903954
28  return (T(0) < val) - (val < T(0));
29 }
30 
31 //! \}
32 
33 } // namespace tlx
34 
35 #endif // !TLX_MATH_SGN_HEADER
36 
37 /******************************************************************************/
T
double T
Definition: logistic_regression.cpp:34
tlx::sgn
int sgn(const T &val)
sgn() - signum
Definition: sgn.hpp:26