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26 Numerics library [numerics]

26.8 Mathematical functions for floating-point types [c.math]

26.8.5 Classification / comparison functions [c.math.fpclass]

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The classification / comparison functions behave the same as the C macros with the corresponding names defined in the C standard library.
Each function is overloaded for the three floating-point types.
See also: ISO C 7.12.3, 7.12.4