std::numeric_limits< _Tp > Struct Template Reference
Inheritance diagram for std::numeric_limits< _Tp >:
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## Static Public Member Functions

static constexpr _Tp | denorm_min () noexcept
static constexpr _Tp | epsilon () noexcept
static constexpr _Tp | infinity () noexcept
static constexpr _Tp | lowest () noexcept
static constexpr _Tp | max () noexcept
static constexpr _Tp | min () noexcept
static constexpr _Tp | quiet_NaN () noexcept
static constexpr _Tp | round_error () noexcept
static constexpr _Tp | signaling_NaN () noexcept

## Static Public Attributes

static constexpr int | digits
static constexpr int | digits10
static constexpr float_denorm_style | has_denorm
static constexpr bool | has_denorm_loss
static constexpr bool | has_infinity
static constexpr bool | has_quiet_NaN
static constexpr bool | has_signaling_NaN
static constexpr bool | is_bounded
static constexpr bool | is_exact
static constexpr bool | is_iec559
static constexpr bool | is_integer
static constexpr bool | is_modulo
static constexpr bool | is_signed
static constexpr bool | is_specialized
static constexpr int | max_digits10
static constexpr int | max_exponent
static constexpr int | max_exponent10
static constexpr int | min_exponent
static constexpr int | min_exponent10
static constexpr int | radix
static constexpr float_round_style | round_style
static constexpr bool | tinyness_before
static constexpr 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 304 of file limits.

## Member Function Documentation

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::denorm_min | ( |  | ) |

inlinestaticnoexcept

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

Definition at line 349 of file limits.

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::epsilon | ( |  | ) |

inlinestaticnoexcept

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

Definition at line 325 of file limits.

Referenced by std::poisson_distribution< _IntType >::operator()(), and std::binomial_distribution< _IntType >::operator()().

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::infinity | ( |  | ) |

inlinestaticnoexcept

The representation of positive infinity, if `has_infinity`.

Definition at line 333 of file limits.

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::lowest | ( |  | ) |

inlinestaticnoexcept

A finite value x such that there is no other finite value y where y < x.

Definition at line 319 of file limits.

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::max | ( |  | ) |

inlinestaticnoexcept

The maximum finite value.

Definition at line 313 of file limits.

Referenced by std::normal_distribution< result_type >::max(), std::lognormal_distribution< _RealType >::max(), std::gamma_distribution< result_type >::max(), std::chi_squared_distribution< _RealType >::max(), std::cauchy_distribution< _RealType >::max(), std::fisher_f_distribution< _RealType >::max(), std::student_t_distribution< _RealType >::max(), std::bernoulli_distribution::max(), std::geometric_distribution< _IntType >::max(), std::negative_binomial_distribution< _IntType >::max(), std::poisson_distribution< _IntType >::max(), std::exponential_distribution< _RealType >::max(), std::weibull_distribution< _RealType >::max(), std::extreme_value_distribution< _RealType >::max(), std::tr2::dynamic_bitset< _WordT, _Alloc >::max_size(), std::independent_bits_engine< _RandomNumberEngine, __w, _UIntType >::operator()(), std::poisson_distribution< _IntType >::operator()(), and std::binomial_distribution< _IntType >::operator()().

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::min | ( |  | ) |

inlinestaticnoexcept

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

Definition at line 309 of file limits.

Referenced by std::normal_distribution< result_type >::min(), std::cauchy_distribution< _RealType >::min(), std::student_t_distribution< _RealType >::min(), std::bernoulli_distribution::min(), std::extreme_value_distribution< _RealType >::min(), and std::independent_bits_engine< _RandomNumberEngine, __w, _UIntType >::operator()().

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::quiet_NaN | ( |  | ) |

inlinestaticnoexcept

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

Definition at line 338 of file limits.

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::round_error | ( |  | ) |

inlinestaticnoexcept

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

Definition at line 329 of file limits.

template<typename _Tp >

static constexpr _Tp std::numeric_limits< _Tp >::signaling_NaN | ( |  | ) |

inlinestaticnoexcept

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

Definition at line 343 of file limits.

## Member Data Documentation

constexpr int std::__numeric_limits_base::digits

staticinherited

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 200 of file limits.

constexpr int std::__numeric_limits_base::digits10

staticinherited

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

Definition at line 203 of file limits.

constexpr float_denorm_style std::__numeric_limits_base::has_denorm

staticinherited

See std::float_denorm_style for more information.

Definition at line 255 of file limits.

constexpr bool std::__numeric_limits_base::has_denorm_loss

staticinherited

True if loss of accuracy is detected as a denormalization loss, rather than as an inexact result.

Definition at line 259 of file limits.

constexpr bool std::__numeric_limits_base::has_infinity

staticinherited

True if the type has a representation for positive infinity.

Definition at line 244 of file limits.

constexpr bool std::__numeric_limits_base::has_quiet_NaN

staticinherited

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

Definition at line 248 of file limits.

constexpr bool std::__numeric_limits_base::has_signaling_NaN

staticinherited

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

Definition at line 252 of file limits.

constexpr bool std::__numeric_limits_base::is_bounded

staticinherited

True if the set of values representable by the type is finite. All built-in types are bounded, this member would be false for arbitrary precision types.

Definition at line 268 of file limits.

constexpr bool std::__numeric_limits_base::is_exact

staticinherited

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.

Definition at line 220 of file limits.

constexpr bool std::__numeric_limits_base::is_iec559

staticinherited

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 263 of file limits.

constexpr bool std::__numeric_limits_base::is_integer

staticinherited

True if the type is integer.

Definition at line 215 of file limits.

constexpr bool std::__numeric_limits_base::is_modulo

staticinherited

True if the type is modulo. A type is modulo if, for any operation involving +, -, or * on values of that type whose result would fall outside the range [min(),max()], the value returned differs from the true value by an integer multiple of max() - min() + 1. On most machines, this is false for floating types, true for unsigned integers, and true for signed integers. See PR22200 about signed integers.

Definition at line 277 of file limits.

constexpr bool std::__numeric_limits_base::is_signed

staticinherited

True if the type is signed.

Definition at line 212 of file limits.

constexpr bool std::__numeric_limits_base::is_specialized

staticinherited

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

Definition at line 195 of file limits.

constexpr int std::__numeric_limits_base::max_digits10

staticinherited

The number of base 10 digits required to ensure that values which differ are always differentiated.

Definition at line 208 of file limits.

constexpr int std::__numeric_limits_base::max_exponent

staticinherited

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 237 of file limits.

constexpr int std::__numeric_limits_base::max_exponent10

staticinherited

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

Definition at line 241 of file limits.

constexpr int std::__numeric_limits_base::min_exponent

staticinherited

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 228 of file limits.

constexpr int std::__numeric_limits_base::min_exponent10

staticinherited

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

Definition at line 232 of file limits.

constexpr int std::__numeric_limits_base::radix

staticinherited

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

Definition at line 224 of file limits.

constexpr float_round_style std::__numeric_limits_base::round_style

staticinherited

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 288 of file limits.

constexpr bool std::__numeric_limits_base::tinyness_before

staticinherited

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

Definition at line 283 of file limits.

constexpr bool std::__numeric_limits_base::traps

staticinherited

True if trapping is implemented for this type.

Definition at line 280 of file limits.

The documentation for this struct was generated from the following file:

- limits