C++ version of isnormal()

Question

Is there a C++ version of the isnormal, isnan and so C functions? I know I can use the C functions from C++, but I'm always interested to know if there are some C++-only alternatives.

score 5 · Answer 1 · answered Oct 05 '09 at 14:17

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They're included in <cmath> in the C++0x draft:

template <class T> int fpclassify(T x);
template <class T> bool isfinite(T x);
template <class T> bool isinf(T x);
template <class T> bool isnan(T x);
template <class T> bool isnormal(T x);

answered Oct 05 '09 at 14:17

Stephen Canon

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Have they been included in the published version of the standard? – static_rtti Feb 19 '13 at 13:55

bua · Answer 2 · 2009-10-05T14:07:28.250

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There is no such a functionality in stl. You could check that in reference: cppreference

C functionalities was placed in C++ and APIs are available through headers without postfix "*.h" and with prefix "c" example

<cstdlib>

But I'm certain You know about it.

If You're looking for something simmilar you probably would find many C like functions in amazing boost library. Most of classes would be introduced to new C++ standard so its worth to learn.

boost

edited Oct 05 '09 at 14:07

answered Oct 05 '09 at 13:57

bua

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Maybe not. You (http://stackoverflow.com/users/147845/you) seems to prefer PHP and Web based questions. – graham.reeds Oct 05 '09 at 14:02

score 1 · Accepted Answer · answered Oct 05 '09 at 14:00

1

Not as far as I know. Doesn't look like there's one in the STL. Since that's such a simple function I would guess they didn't want to take the time to replace it. The old C version works fine. I would say just continue to use the C isnormal().

answered Oct 05 '09 at 14:00

Daniel Bingham

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C++ version of isnormal()

3 Answers3