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Showing content from https://timsong-cpp.github.io/cppwp/n4659/fp.style below:

21 Language support library [language.support]

namespace std {
  enum float_round_style {
    round_indeterminate       = -1,
    round_toward_zero         =  0,
    round_to_nearest          =  1,
    round_toward_infinity     =  2,
    round_toward_neg_infinity =  3
  };
}

The rounding mode for floating-point arithmetic is characterized by the values:

• round_­indeterminate if the rounding style is indeterminable

• round_­toward_­zero if the rounding style is toward zero

• round_­to_­nearest if the rounding style is to the nearest representable value

• round_­toward_­infinity if the rounding style is toward infinity

• round_­toward_­neg_­infinity if the rounding style is toward negative infinity

namespace std {
  enum float_denorm_style {
    denorm_indeterminate = -1,
    denorm_absent = 0,
    denorm_present = 1
  };
}

The presence or absence of subnormal numbers (variable number of exponent bits) is characterized by the values:

• denorm_­indeterminate if it cannot be determined whether or not the type allows subnormal values

• denorm_­absent if the type does not allow subnormal values

• denorm_­present if the type does allow subnormal values

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