Varianti

    std::numeric_limits

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    <metanoindex/>

     
    C++
     
    Utilità libreria
    Tipo di supporto (basic types, RTTI, type traits)
    Gestione della memoria dinamica
    La gestione degli errori
    Programma di utilità
    Funzioni variadic
    Data e ora
    Funzione oggetti
    initializer_list(C++11)
    bitset
    hash(C++11)
    Gli operatori relazionali
    Original:
    Relational operators
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    rel_ops::operator!=
    rel_ops::operator>
    rel_ops::operator<=
    rel_ops::operator>=
    Coppie e tuple
    Original:
    Pairs and tuples
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    pair
    tuple(C++11)
    piecewise_construct_t(C++11)
    piecewise_construct(C++11)
    Swap, in avanti e spostare
    Original:
    Swap, forward and move
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    swap
    forward(C++11)
    move(C++11)
    move_if_noexcept(C++11)
    declval(C++11)
     
    Tipo di supporto
    Tipi base
    Original:
    Basic types
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    Tipi fondamentali
    Larghezza fissa interi tipi (C++11)
    Limiti numerici
    Original:
    Numeric limits
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    numeric_limits
    C numerico limita interfaccia
    Informazioni sul tipo di runtime
    Original:
    Runtime type information
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    Tipo tratti
    Original:
    Type traits
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    Categorie di tipo primario
    Original:
    Primary type categories
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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)
    is_reference(C++11)
    is_lvalue_reference(C++11)
    is_rvalue_reference(C++11)
    is_member_pointer(C++11)
    is_member_object_pointer(C++11)
    is_member_function_pointer(C++11)
    Proprietà del tipo
    Original:
    Type properties
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    is_const(C++11)
    is_volatile(C++11)
    is_pod(C++11)
    is_empty(C++11)
    is_polymorphic(C++11)
    is_abstract(C++11)
    Operazioni supportate
    Original:
    Supported operations
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    is_constructible
    is_trivially_constructible
    is_nothrow_constructible    		(C++11)
    (C++11)
    (C++11)
    is_default_constructible
    is_trivially_default_constructible
    is_nothrow_default_constructible    		(C++11)
    (C++11)
    (C++11)
    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)
    is_copy_assignable
    is_trivially_copy_assignable
    is_nothrow_copy_assignable    		(C++11)
    (C++11)
    (C++11)
    is_move_assignable
    is_trivially_move_assignable
    is_nothrow_move_assignable    		(C++11)
    (C++11)
    (C++11)
    is_destructible
    is_trivially_destructible
    is_nothrow_destructible    		(C++11)
    (C++11)
    (C++11)
    has_virtual_destructor(C++11)
    I rapporti e le query di proprietà
    Original:
    Relationships and property queries
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    is_same(C++11)
    is_base_of(C++11)
    is_convertible(C++11)
    alignment_of(C++11)
    rank(C++11)
    extent(C++11)
    Tipo modifiche
    Original:
    Type modifications
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    remove_cv
    remove_const
    remove_volatile    		(C++11)
    (C++11)
    (C++11)
    add_cv
    add_const
    add_volatile    		(C++11)
    (C++11)
    (C++11)
    make_signed(C++11)
    make_unsigned(C++11)
    Tipo di trasformazioni
    Original:
    Type transformations
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    aligned_storage(C++11)
    aligned_union(C++11)
    decay(C++11)
    enable_if(C++11)
    conditional(C++11)
    common_type(C++11)
    underlying_type(C++11)
    result_of(C++11)
    Digitare costanti tratto
    Original:
    Type trait constants
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    integral_constant(C++11)
     
    std::numeric_limits
    Costanti statiche
    Original:
    Static constants
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    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
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    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
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    float_round_style
    float_denorm_style
     
    <tbody> </tbody>
    Elemento definito nell'header <limits>
    template< class T > class numeric_limits;
    Il modello di classe numeric_limits fornisce un modo standardizzato per interrogare diverse proprietà di tipi fondamentali (ad esempio, il valore massimo possibile per il tipo int è std::numeric_limits<int>::max()).
    Original:
    The numeric_limits class template provides a standardized way to query various properties of fundamental types (e.g. the largest possible value for type int is std::numeric_limits<int>::max()).
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    Queste informazioni vengono fornite attraverso specializzazioni del modello numeric_limits. La libreria standard rende specializzazioni disponibili per tutti i tipi fondamentali:
    Original:
    This information is provided via specializations of the numeric_limits template. The standard library makes available specializations for all fundamental types:
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    <tbody> </tbody>
    Elemento definito nell'header <limits>
    template<> class numeric_limits<bool>; template<> class numeric_limits<char>; template<> class numeric_limits<signed char>; template<> class numeric_limits<unsigned char>; template<> class numeric_limits<wchar_t>; template<> class numeric_limits<char16_t>; // C++11 feature template<> class numeric_limits<char32_t>; // C++11 feature template<> class numeric_limits<short>; template<> class numeric_limits<unsigned short>; template<> class numeric_limits<int>; template<> class numeric_limits<unsigned int>; template<> class numeric_limits<long>; template<> class numeric_limits<unsigned long>; template<> class numeric_limits<long long>; template<> class numeric_limits<unsigned long long>; template<> class numeric_limits<float>; template<> class numeric_limits<double>; template<> class numeric_limits<long double>;
    Inoltre, esiste una specializzazione per ogni cv qualificato versione di ciascun tipo fondamentale, identica alla specializzazione qualificato, ad esempio std::numeric_limits<const int>, std::numeric_limits<volatile int> e std::numeric_limits<const volatile int> sono forniti e sono equivalenti a std::numeric_limits<int>.
    Original:
    Additionally, a specialization exists for every cv-qualified version of each fundamental type, identical to the unqualified specialization, e.g. std::numeric_limits<const int>, std::numeric_limits<volatile int>, and std::numeric_limits<const volatile int> are provided and are equivalent to std::numeric_limits<int>.
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    I tipi di libreria standard, che sono gli alias di tipi fondamentali (come ad esempio std::size_t o std::streamsize possono essere esaminati anche con i caratteri morfologici std::numeric_limits.
    Original:
    The standard library types that are aliases of fundamental types (such as std::size_t or std::streamsize may also be examined with the std::numeric_limits type traits.
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    implementazioni possono prevedere specializzazioni std::numeric_limits per l'attuazione di specifici tipi: ad es.. GCC fornisce std::numeric_limits<__int128> librerie possono aggiungere specializzazioni per la biblioteca forniti tipi, ad esempio OpenEXR prevede std::numeric_limits<half> per un 16-bit in virgola mobile di tipo.
    Original:
    Implementations may provide specializations of std::numeric_limits for implementation-specific types: e.g. GCC provides std::numeric_limits<__int128>. Libraries may add specializations for library-provided types, e.g. OpenEXR provides std::numeric_limits<half> for a 16-bit floating-point type.
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    Membri costanti

    [statico]
    identifica i tipi per i quali è specializzata std::numeric_limits
    Original:
    identifies types for which std::numeric_limits is specialized
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi di firma
    Original:
    identifies signed types
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi interi
    Original:
    identifies integer types
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi esatti
    Original:
    identifies exact types
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi a virgola mobile che possono rappresentare la speciale "positive infinity" valore
    Original:
    identifies floating-point types that can represent the special value "positive infinity"
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi a virgola mobile che possono rappresentare il valore speciale "tranquilla, non-a-number" (NaN)
    Original:
    identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi a virgola mobile che possono rappresentare il valore speciale "segnalazione non-a-number" (NaN)
    Original:
    identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica lo stile denormalizzazione utilizzato dal tipo a virgola mobile
    Original:
    identifies the denormalization style used by the floating-point type
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    (pubblico membro statico costante) [modifica]
    [statico]
    		 identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
    (pubblico membro statico costante) [modifica]
    [statico]
    identifica lo stile di arrotondamento usato dal tipo
    Original:
    identifies the rounding style used by the type
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    (pubblico membro statico costante) [modifica]
    [statico]
    individua le IEC 559/IEEE 754 tipi a virgola mobile
    Original:
    identifies the IEC 559/IEEE 754 floating-point types
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    (pubblico membro statico costante) [modifica]
    [statico]
    		 identifies types that represent a finite set of values
    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi che gestiscono trabocca con l'aritmetica modulo
    Original:
    identifies types that handle overflows with modulo arithmetic
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    (pubblico membro statico costante) [modifica]
    [statico]
    numero di cifre radix che possono essere rappresentati senza cambiamenti
    Original:
    number of radix digits that can be represented without change
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    (pubblico membro statico costante) [modifica]
    [statico]
    numero di cifre decimali che possono essere rappresentati senza modifiche
    Original:
    number of decimal digits that can be represented without change
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    (pubblico membro statico costante) [modifica]
    [statico] (C++11)
    numero di cifre decimali necessario differenziare tutti i valori di questo tipo
    Original:
    number of decimal digits necessary to differentiate all values of this type
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    (pubblico membro statico costante) [modifica]
    [statico]
    la radice o base intero utilizzato dalla rappresentazione del tipo specificato
    Original:
    the radix or integer base used by the representation of the given type
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    (pubblico membro statico costante) [modifica]
    [statico]
    oltre la più piccola potenza negativa della radice che è una valida virgola mobile normalizzato valore uno
    Original:
    one more than the smallest negative power of the radix that is a valid normalized floating-point value
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    (pubblico membro statico costante) [modifica]
    [statico]
    la più piccola potenza negativa di dieci, che è un valido normalizzato valore a virgola mobile
    Original:
    the smallest negative power of ten that is a valid normalized floating-point value
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    (pubblico membro statico costante) [modifica]
    [statico]
    maggiore della massima potenza intera della radice che è una valida finita valore a virgola mobile uno
    Original:
    one more than the largest integer power of the radix that is a valid finite floating-point value
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    (pubblico membro statico costante) [modifica]
    [statico]
    la più grande potenza intera di 10 che è un valido finita valore a virgola mobile
    Original:
    the largest integer power of 10 that is a valid finite floating-point value
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi che possono causare operazioni aritmetiche per intrappolare
    Original:
    identifies types which can cause arithmetic operations to trap
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    (pubblico membro statico costante) [modifica]
    [statico]
    identifica i tipi a virgola mobile che rilevano tinyness prima dell'arrotondamento
    Original:
    identifies floating-point types that detect tinyness before rounding
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    (pubblico membro statico costante) [modifica]

    Membri funzioni

    [statico]
    restituisce il più piccolo valore finito del tipo specificato
    Original:
    returns the smallest finite value of the given type
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    (metodo pubblico statico) [modifica]
    [statico] (C++11)
    restituisce il valore più basso finito del tipo specificato
    Original:
    returns the lowest finite value of the given type
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    (metodo pubblico statico) [modifica]
    [statico]
    restituisce il più grande valore finito del tipo specificato
    Original:
    returns the largest finite value of the given type
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    (metodo pubblico statico) [modifica]
    [statico]
    restituisce la differenza tra 1.0 e il valore successivo rappresentabile di un dato tipo a virgola mobile
    Original:
    returns the difference between 1.0 and the next representable value of the given floating-point type
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    (metodo pubblico statico) [modifica]
    [statico]
    restituisce l'errore massimo di arrotondamento di un dato tipo a virgola mobile
    Original:
    returns the maximum rounding error of the given floating-point type
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    (metodo pubblico statico) [modifica]
    [statico]
    restituisce il valore positivo infinito di un dato tipo a virgola mobile
    Original:
    returns the positive infinity value of the given floating-point type
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    (metodo pubblico statico) [modifica]
    [statico]
    restituisce un valore NaN tranquilla di un dato tipo a virgola mobile
    Original:
    returns a quiet NaN value of the given floating-point type
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    (metodo pubblico statico) [modifica]
    [statico]
    restituisce un valore NaN segnalazione di un dato tipo a virgola mobile
    Original:
    returns a signaling NaN value of the given floating-point type
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    (metodo pubblico statico) [modifica]
    [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
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    (metodo pubblico statico) [modifica]

    Helper classi
    indica virgola mobile modalità di arrotondamento
    Original:
    indicates floating-point rounding modes
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    (enum) [modifica]
    indica le modalità a virgola mobile denormalizzazione
    Original:
    indicates floating-point denormalization modes
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    (enum) [modifica]

    Rapporti con C biblioteca costanti macro

    Specialization Members
    min() lowest()
    (C++11)     		max() epsilon() digits digits10 min_exponent min_exponent10 max_exponent max_exponent10 radix
    numeric_limits< bool > 2
    numeric_limits< char > CHAR_MIN CHAR_MIN CHAR_MAX 2
    numeric_limits< signed char > SCHAR_MIN SCHAR_MIN SCHAR_MAX 2
    numeric_limits< unsigned char > 0 0 UCHAR_MAX 2
    numeric_limits< wchar_t > WCHAR_MIN WCHAR_MIN WCHAR_MAX 2
    numeric_limits< char16_t > 0 0 UINT_LEAST16_MAX 2
    numeric_limits< char32_t > 0 0 UINT_LEAST32_MAX 2
    numeric_limits< short > SHRT_MIN SHRT_MIN SHRT_MAX 2
    numeric_limits< signed short >
    numeric_limits< unsigned short > 0 0 USHRT_MAX 2
    numeric_limits< int > INT_MIN INT_MIN INT_MAX 2
    numeric_limits< signed int >
    numeric_limits< unsigned int > 0 0 UINT_MAX 2
    numeric_limits< long > LONG_MIN LONG_MIN LONG_MAX 2
    numeric_limits< signed long >
    numeric_limits< unsigned long > 0 0 ULONG_MAX 2
    numeric_limits< long long > LLONG_MIN LLONG_MIN LLONG_MAX 2
    numeric_limits< signed long long >
    numeric_limits< unsigned long long > 0 0 ULLONG_MAX 2
    numeric_limits< float > FLT_MIN -FLT_MAX FLT_MAX FLT_EPSILON FLT_MANT_DIG FLT_DIG FLT_MIN_EXP FLT_MIN_10_EXP FLT_MAX_EXP FLT_MAX_10_EXP FLT_RADIX
    numeric_limits< double > DBL_MIN -DBL_MAX DBL_MAX DBL_EPSILON DBL_MANT_DIG DBL_DIG DBL_MIN_EXP DBL_MIN_10_EXP DBL_MAX_EXP DBL_MAX_10_EXP FLT_RADIX
    numeric_limits< long double > LDBL_MIN -LDBL_MAX LDBL_MAX LDBL_EPSILON LDBL_MANT_DIG LDBL_DIG LDBL_MIN_EXP LDBL_MIN_10_EXP LDBL_MAX_EXP LDBL_MAX_10_EXP FLT_RADIX

    Esempio

    #include <limits>
#include <iostream>

int main() 
{
    std::cout << "type\tlowest\thighest\n";
    std::cout << "int\t"
              << std::numeric_limits<int>::lowest() << '\t'
              << std::numeric_limits<int>::max() << '\n';
    std::cout << "float\t"
              << std::numeric_limits<float>::lowest() << '\t'
              << std::numeric_limits<float>::max() << '\n';
    std::cout << "double\t"
              << std::numeric_limits<double>::lowest() << '\t'
              << std::numeric_limits<double>::max() << '\n';
}

    Possible output: 

    type    lowest         highest
int     -2147483648    2147483647
float   -3.40282e+38   3.40282e+38
double  -1.79769e+308  1.79769e+308