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    <metanoindex/>

     
    C++
     
    Bibliothque d'utilitaires
     
    Soutien aux types fondamentaux
    Les types de base
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    Basic types
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    Types fondamentaux
    Fixe les types entiers largeur (C++11)
    Limites numriques
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    Numeric limits
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    numeric_limits
    C numrique limite interface
    Informations sur le type d'excution
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    Runtime type information
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    Caractres de type
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    Type traits
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    Catgories de type primaire
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    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)
    Les proprits du type
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    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)
    Oprations prises en charge
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    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)
    Les relations et les requtes de proprit
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    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)
    Modifications de type
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    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)
    Transformations de type
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    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)
    Tapez constantes traits
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    Type trait constants
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    integral_constant (C++11)
     
    std::numeric_limits
    Constantes statiques
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    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
    Fonctions membres statiques
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    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
    Types d'aide
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    Helper types
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    float_round_style
    float_denorm_style
     
    <tbody> </tbody>
    Dclar dans l'en-tte <limits>
    template< class T > class numeric_limits;
    Le modle de classe numeric_limits fournit un moyen standard pour rechercher des proprits diffrentes types fondamentaux (par exemple, la plus grande valeur possible pour le type int est std::numeric_limits<int>::max()) .
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    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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    Cette information est fournie par l'intermdiaire des spcialisations du modle numeric_limits. La bibliothque standard permet spcialisations disponibles pour tous les types fondamentaux:
    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>
    Dclar dans l'en-tte <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>;
    En outre, une spcialisation existe pour chaque version de cv-qualifi de chaque type fondamental, identique la spcialisation sans rserve, par exemple, std::numeric_limits<const int>, std::numeric_limits<volatile int> et std::numeric_limits<const volatile int> sont fournis et sont quivalentes 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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    Les types de bibliothques standards qui sont des alias des types fondamentaux (tels que std::size_t ou std::streamsize peut galement tre consult avec les caractres de 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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    implmentations peuvent fournir des spcialisations de std::numeric_limits de mise en uvre spcifiques aux types: par ex. GCC fournit. std::numeric_limits<__int128> bibliothques peuvent ajouter des spcialisations pour la bibliothque fournis par types, par exemple OpenEXR dispose std::numeric_limits<half> pour un 16-bit virgule flottante de type .
    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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    Constantes membres

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    identifie les types pour lesquels std::numeric_limits est spcialise
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    identifies types for which std::numeric_limits is specialized
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    identifie les types signs
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    identifies signed types
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    statique
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    identifie les types entiers
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    identifies integer types
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    static
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    identifie les types exacts
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    identifies exact types
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    statique
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    static
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    identifie types virgule flottante qui peuvent reprsenter la valeur spciale "infini positif"
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    identifies floating-point types that can represent the special value "positive infinity"
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    identifie types virgule flottante qui peuvent reprsenter la valeur spciale "calme pas-a-number (NaN)
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    identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
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    identifie types virgule flottante qui peuvent reprsenter la valeur spciale "signalisation non-a-number (NaN)
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    identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
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    identifie le style utilis par la dnormalisation du type virgule flottante
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    identifies the denormalization style used by the floating-point type
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    identifie les types virgule flottante qui dtectent une perte de prcision que la perte de dnormalisation plutt que des rsultats inexacts
    Original:
    identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
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    identifie le type d'arrondi utilis par le type
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    identifies the rounding style used by the type
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    identifie les IEC 559/IEEE 754 types virgule flottante
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    identifies the IEC 559/IEEE 754 floating-point types
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    identifie des types qui reprsentent un ensemble fini de valeurs
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    identifies types that represent a finite set of values
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    identifie les types qui grent les dbordements avec l'arithmtique modulo
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    identifies types that handle overflows with modulo arithmetic
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    nombre de chiffres radix qui peuvent tre reprsentes sans changement
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    number of radix digits that can be represented without change
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    nombre de chiffres dcimaux qui peuvent tre reprsentes sans changement
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    number of decimal digits that can be represented without change
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    nombre de chiffres dcimaux ncessaires pour diffrencier les valeurs de ce type
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    number of decimal digits necessary to differentiate all values of this type
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    la base ou la base utilise par nombre entier de la reprsentation du type donn
    Original:
    the radix or integer base used by the representation of the given type
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    un de plus que la plus petite puissance ngative de la racine qui est valide normalis valeur virgule flottante
    Original:
    one more than the smallest negative power of the radix that is a valid normalized floating-point value
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    la plus petite puissance ngative de dix qui est valide normalis valeur virgule flottante
    Original:
    the smallest negative power of ten that is a valid normalized floating-point value
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    un de plus que la plus grande puissance entire de la racine qui est valide finie valeur virgule flottante
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    one more than the largest integer power of the radix that is a valid finite floating-point value
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    la plus grande puissance entire de 10 qui est valide finie valeur virgule flottante
    Original:
    the largest integer power of 10 that is a valid finite floating-point value
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    identifie les types qui peuvent causer des oprations arithmtiques piger
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    identifies types which can cause arithmetic operations to trap
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    identifie types virgule flottante qui dtectent tinyness avant arrondis
    Original:
    identifies floating-point types that detect tinyness before rounding
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    Fonctions membres

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    renvoie la plus petite valeur finie du type donn
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    returns the smallest finite value of the given type
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    (fonction membre publique statique) [edit]
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    renvoie la plus petite valeur finie du type donn
    Original:
    returns the lowest finite value of the given type
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    (fonction membre publique statique) [edit]
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    statique
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    renvoie la plus grande valeur finie du type donn
    Original:
    returns the largest finite value of the given type
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    (fonction membre publique statique) [edit]
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    renvoie la diffrence entre 1.0 et la prochaine valeur reprsentable de la donne virgule flottante de type
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    returns the difference between 1.0 and the next representable value of the given floating-point type
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    retourne l'erreur d'arrondi maximum de la donne virgule flottante de type
    Original:
    returns the maximum rounding error of the given floating-point type
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    (fonction membre publique statique) [edit]
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    renvoie la valeur infinie positive de la donne virgule flottante de type
    Original:
    returns the positive infinity value of the given floating-point type
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    (fonction membre publique statique) [edit]
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    renvoie une valeur NaN calme de la donne virgule flottante de type
    Original:
    returns a quiet NaN value of the given floating-point type
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    renvoie une valeur NaN de signalisation de la donne virgule flottante de type
    Original:
    returns a signaling NaN value of the given floating-point type
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    (fonction membre publique statique) [edit]
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    retourne la plus petite valeur positive infrieure la normale de la donne virgule flottante de type
    Original:
    returns the smallest positive subnormal value of the given floating-point type
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    (fonction membre publique statique) [edit]

    Classes d'aide
    indique modes d'arrondi en virgule flottante
    Original:
    indicates floating-point rounding modes
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    (enum) [edit]
    indique les modes de dnormalisation virgule flottante
    Original:
    indicates floating-point denormalization modes
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    (enum) [edit]

    Relations avec les constantes C macro bibliothque

    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

    Exemple

    #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';
}

    Rsultat possible : 

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