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29 Numerics library [numerics]

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

29.7.5 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.
See also: ISO/IEC 9899:2024, 7.12.4, 7.12.18