std::numeric_limits::lowest

 

C++

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Gli operatori relazionali Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

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tuple (C++11)

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piecewise_construct (C++11)

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swap

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declval (C++11)

 

Tipo di supporto

Tipi base Original: Basic types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Tipi fondamentali
Larghezza fissa interi tipi(C++11)
ptrdiff_t size_t max_align_t (C++11)	nullptr_t (C++11) offsetof NULL
Limiti numerici Original: Numeric limits The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
numeric_limits
C numerico limita interfaccia
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type_info type_index (C++11)	bad_typeid bad_cast
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is_void (C++11) is_array (C++11) is_pointer (C++11) is_enum (C++11) is_union (C++11) is_class (C++11) is_function (C++11)	is_object (C++11) is_scalar (C++11) is_compound (C++11) is_integral (C++11) is_floating_point (C++11) is_fundamental (C++11) is_arithmetic (C++11)
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is_copy_constructible is_trivially_copy_constructible is_nothrow_copy_constructible (C++11) (C++11) (C++11)
is_move_constructible is_trivially_move_constructible is_nothrow_move_constructible (C++11) (C++11) (C++11)
is_assignable is_trivially_assignable is_nothrow_assignable (C++11) (C++11) (C++11)
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integral_constant (C++11)

 

std::numeric_limits

Costanti statiche Original: Static constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

numeric_limits::is_specialized

numeric_limits::is_signed

numeric_limits::is_integer

numeric_limits::is_exact

numeric_limits::has_infinity

numeric_limits::has_quiet_NaN

numeric_limits::has_signaling_NaN

numeric_limits::has_denorm

numeric_limits::has_denorm_loss

numeric_limits::round_style

numeric_limits::is_iec559

numeric_limits::is_bounded

numeric_limits::is_modulo

numeric_limits::digits

numeric_limits::digits10

numeric_limits::max_digits10 (C++11)

numeric_limits::radix

numeric_limits::min_exponent

numeric_limits::min_exponent10

numeric_limits::max_exponent

numeric_limits::max_exponent10

numeric_limits::traps

numeric_limits::tinyness_before

Funzioni membro statiche Original: Static member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

numeric_limits::min

numeric_limits::lowest (C++11)

numeric_limits::max

numeric_limits::epsilon

numeric_limits::round_error

numeric_limits::infinity

numeric_limits::quiet_NaN

numeric_limits::signaling_NaN

numeric_limits::denorm_min

Helper tipi Original: Helper types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

float_round_style

float_denorm_style

 

staticconstexpr T lowest()		(dal C++11)

Restituisce il valore più basso finito rappresentabile dalla T tipo numerico, cioè un valore finito x tale che non vi è altro valore finito y dove y < x. Questo è diverso da std::numeric_limits<T>::min() per tipi a virgola mobile. Solo significativo per i tipi limitati.

Original:

Returns the lowest finite value representable by the numeric type T, that is, a finite value x such that there is no other finite value y where y < x. This is different from std::numeric_limits<T>::min() for floating-point types. Only meaningful for bounded types.

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Valore di ritorno

T	std::numeric_limits<T>::lowest()
/* non-specialized */	T();
bool	false
char	CHAR_MIN
signedchar	SCHAR_MIN
unsignedchar	​0​
wchar_t	WCHAR_MIN
char16_t	​0​
char32_t	​0​
short	SHRT_MIN
unsignedshort	​0​
int	INT_MIN
unsignedint	​0​
long	LONG_MIN
unsignedlong	​0​
longlong	LLONG_MIN
unsignedlonglong	​0​
float	-FLT_MAX
double	-DBL_MAX
longdouble	-LDBL_MAX

Note

Anche se non è vero per il fondamentale C + + floating-poing tipi, di terze parti in virgola mobile di tipo T possono esistere in modo tale che std::numeric_limits<T>::lowest()!=-std::numeric_limits<T>::max().

Original:

While it's not true for fundamental C++ floating-poing types, a third-party floating-point type T may exist such that std::numeric_limits<T>::lowest()!=-std::numeric_limits<T>::max().

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Eccezioni

noexcept specification:  

noexcept

  (dal C++11)

Esempio

Dimostra min, max, e più basso per tipi a virgola mobile

Original:

Demonstrates min, max, and lowest for floating-point types

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#include <limits>#include <iostream>int main(){   std::cout<<"std::numeric_limits<T>::min():\n"<<"\tfloat: "<<std::numeric_limits<float>::min()<<" or "<<std::hexfloat<<std::numeric_limits<float>::min()<<'\n'<<"\tdouble: "<<std::defaultfloat<<std::numeric_limits<double>::min()<<" or "<<std::hexfloat<<std::numeric_limits<double>::min()<<'\n';std::cout<<"std::numeric_limits<T>::lowest():\n"<<"\tfloat: "<<std::defaultfloat<<std::numeric_limits<float>::lowest()<<" or "<<std::hexfloat<<std::numeric_limits<float>::lowest()<<'\n'<<"\tdouble: "<<std::defaultfloat<<std::numeric_limits<double>::lowest()<<" or "<<std::hexfloat<<std::numeric_limits<double>::lowest()<<'\n';std::cout<<"std::numeric_limits<T>::max():\n"<<"\tfloat: "<<std::defaultfloat<<std::numeric_limits<float>::max()<<" or "<<std::hexfloat<<std::numeric_limits<float>::max()<<'\n'<<"\tdouble: "<<std::defaultfloat<<std::numeric_limits<double>::max()<<" or "<<std::hexfloat<<std::numeric_limits<double>::max()<<'\n';}

Output:

std::numeric_limits<T>::min(): float: 1.17549e-38 or 0x1p-126 double: 2.22507e-308 or 0x1p-1022 std::numeric_limits<T>::lowest(): float: -3.40282e+38 or -0x1.fffffep+127 double: -1.79769e+308 or -0x1.fffffffffffffp+1023 std::numeric_limits<T>::max(): float: 3.40282e+38 or 0x1.fffffep+127 double: 1.79769e+308 or 0x1.fffffffffffffp+1023

Vedi anche

min [statico]	restituisce il più piccolo valore finito del tipo specificato Original: returns the smallest finite value of the given type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico statico)
denorm_min [statico]	restituisce il più piccolo valore positivo subnormale di un dato tipo a virgola mobile Original: returns the smallest positive subnormal value of the given floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico statico)
max [statico]	restituisce il più grande valore finito del tipo specificato Original: returns the largest finite value of the given type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico statico)