17 Language support library [support]

17.3 Implementation properties [support.limits]

17.3.4 Floating-point type properties [fp.style] Type float_­denorm_­style [denorm.style]

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