std::numeric_limits - Man Page

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 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

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.

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

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

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

The representation of positive infinity, if has_infinity.

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

Referenced by std::cauchy_distribution< _RealType >::min(), std::extreme_value_distribution< _RealType >::min(), std::normal_distribution< _RealType >::min(), and std::student_t_distribution< _RealType >::min().

The maximum finite value.

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

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

Referenced by std::bernoulli_distribution::min().

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

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

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

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.

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

See std::float_denorm_style for more information.

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

True if the type has a representation for positive infinity.

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

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

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.

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.

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.)

True if the type is integer.

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.

True if the type is signed.

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

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

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

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

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

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

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

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

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

True if trapping is implemented for this type.