std::numeric_limits(3)

NAME
std::numeric_limits - Properties of fundamental types.

SYNOPSIS

Inherits std::__numeric_limits_base.

  Static Public Member Functions
static _Tp denorm_min () throw ()
static _Tp epsilon () throw ()
static _Tp infinity () throw ()
static _Tp max () throw ()
static _Tp min () throw ()
static _Tp quiet_NaN () throw ()
static _Tp round_error () throw ()
static _Tp signaling_NaN () throw ()

  Static Public Attributes
static const int digits
static const int digits10
static const float_denorm_style has_denorm
static const bool has_denorm_loss
static const bool has_infinity
static const bool has_quiet_NaN
static const bool has_signaling_NaN
static const bool is_bounded
static const bool is_exact
static const bool is_iec559
static const bool is_integer
static const bool is_modulo
static const bool is_signed
static const bool is_specialized
static const int max_exponent
static const int max_exponent10
static const int min_exponent
static const int min_exponent10
static const int radix
static const float_round_style round_style
static const bool tinyness_before
static const bool traps

Detailed Description

  template<typename _Tp> struct std::numeric_limits< _Tp >
Properties of fundamental types. This class allows a program to obtain information about the representation of a fundamental type on a given platform. For non-fundamental types, the functions will return 0 and the data members will all be false.

_GLIBCXX_RESOLVE_LIB_DEFECTS: DRs 201 and 184 (hi Gaby!) are noted, but not incorporated in this documented (yet).

Definition at line 283 of file limits.

Member Function Documentation

  template<typename _Tp> static _Tp std::numeric_limits< _Tp >::denorm_min () throw () [inline, static]

The minimum positive denormalized value. For types where has_denorm is false, this is the minimum positive normalized value.

Definition at line 305 of file limits.

  template<typename _Tp> static _Tp std::numeric_limits< _Tp >::epsilon () throw () [inline, static]

The machine epsilon: the difference between 1 and the least value greater than 1 that is representable.

Definition at line 292 of file limits.

  template<typename _Tp> static _Tp std::numeric_limits< _Tp >::infinity () throw () [inline, static]

The representation of positive infinity, if has_infinity.

Definition at line 296 of file limits.

  template<typename _Tp> static _Tp std::numeric_limits< _Tp >::max () throw () [inline, static]

The maximum finite value.

Definition at line 289 of file limits.

  template<typename _Tp> static _Tp std::numeric_limits< _Tp >::min () throw () [inline, static]

The minimum finite value, or for floating types with denormalization, the minimum positive normalized value.

Definition at line 287 of file limits.

  template<typename _Tp> static _Tp std::numeric_limits< _Tp >::quiet_NaN () throw () [inline, static]

The representation of a quiet 'Not a Number,' if has_quiet_NaN.

Definition at line 298 of file limits.

  template<typename _Tp> static _Tp std::numeric_limits< _Tp >::round_error () throw () [inline, static]

The maximum rounding error measurement (see LIA-1).

Definition at line 294 of file limits.

  template<typename _Tp> static _Tp std::numeric_limits< _Tp >::signaling_NaN () throw () [inline, static]

The representation of a signaling 'Not a Number,' if has_signaling_NaN.

Definition at line 301 of file limits.

Member Data Documentation

  const int std::__numeric_limits_base::digits [static, inherited]

The number of radix digits that be represented without change: for integer types, the number of non-sign bits in the mantissa; for floating types, the number of radix digits in the mantissa.

Definition at line 202 of file limits.

  const int std::__numeric_limits_base::digits10 [static, inherited]

The number of base 10 digits that can be represented without change.

Definition at line 204 of file limits.

  const float_denorm_style std::__numeric_limits_base::has_denorm [static, inherited]

See std::float_denorm_style for more information.

Definition at line 243 of file limits.

  const bool std::__numeric_limits_base::has_denorm_loss [static, inherited]

Definition at line 246 of file limits.

  const bool std::__numeric_limits_base::has_infinity [static, inherited]

True if the type has a representation for positive infinity.

Definition at line 235 of file limits.

  const bool std::__numeric_limits_base::has_quiet_NaN [static, inherited]

True if the type has a representation for a quiet (non-signaling) 'Not a Number.'

Definition at line 238 of file limits.

  const bool std::__numeric_limits_base::has_signaling_NaN [static, inherited]

True if the type has a representation for a signaling 'Not a Number.'

Definition at line 241 of file limits.

  const bool std::__numeric_limits_base::is_bounded [static, inherited]

Definition at line 254 of file limits.

  const bool std::__numeric_limits_base::is_exact [static, inherited]

True if the type uses an exact representation. 'All integer types are exact, but not all exact types are integer. For example, rational and fixed-exponent representations are exact but not integer.' [18.2.1.2]/15

Definition at line 215 of file limits.

  const bool std::__numeric_limits_base::is_iec559 [static, inherited]

True if-and-only-if the type adheres to the IEC 559 standard, also known as IEEE 754. (Only makes sense for floating point types.)

Definition at line 250 of file limits.

  const bool std::__numeric_limits_base::is_integer [static, inherited]

True if the type is integer. Is this supposed to be 'if the type is integral'?

Definition at line 210 of file limits.

  const bool std::__numeric_limits_base::is_modulo [static, inherited]

True if the type is modulo, that is, if it is possible to add two positive numbers and have a result that wraps around to a third number that is less. Typically false for floating types, true for unsigned integers, and true for signed integers.

Definition at line 259 of file limits.

  const bool std::__numeric_limits_base::is_signed [static, inherited]

True if the type is signed.

Definition at line 206 of file limits.

  const bool std::__numeric_limits_base::is_specialized [static, inherited]

This will be true for all fundamental types (which have specializations), and false for everything else.

Definition at line 197 of file limits.

  const int std::__numeric_limits_base::max_exponent [static, inherited]

The maximum positive integer such that radix raised to the power of (one less than that integer) is a representable finite floating point number.

Definition at line 229 of file limits.

  const int std::__numeric_limits_base::max_exponent10 [static, inherited]

The maximum positive integer such that 10 raised to that power is in the range of representable finite floating point numbers.

Definition at line 232 of file limits.

  const int std::__numeric_limits_base::min_exponent [static, inherited]

The minimum negative integer such that radix raised to the power of (one less than that integer) is a normalized floating point number.

Definition at line 222 of file limits.

  const int std::__numeric_limits_base::min_exponent10 [static, inherited]

The minimum negative integer such that 10 raised to that power is in the range of normalized floating point numbers.

Definition at line 225 of file limits.

  const int std::__numeric_limits_base::radix [static, inherited]

For integer types, specifies the base of the representation. For floating types, specifies the base of the exponent representation.

Definition at line 218 of file limits.

  const float_round_style std::__numeric_limits_base::round_style [static, inherited]

See std::float_round_style for more information. This is only meaningful for floating types; integer types will all be round_toward_zero.

Definition at line 268 of file limits.

  const bool std::__numeric_limits_base::tinyness_before [static, inherited]

True if tininess is detected before rounding. (see IEC 559)

Definition at line 264 of file limits.

  const bool std::__numeric_limits_base::traps [static, inherited]

True if trapping is implemented for this type.

Definition at line 262 of file limits.

Author

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