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      std::numeric_limits

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      C++
       
      Bibliothèque 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 numériques
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      Numeric limits
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      numeric_limits
      C numérique limite interface
      Informations sur le type d'exécution
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      Runtime type information
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      Caractères de type
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      Type traits
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      Catégories 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 propriétés 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)
      Opérations 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 requêtes de propriété
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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
       
      Déclaré dans l'en-tête <limits>
      template<class T >class numeric_limits;
      Le modèle de classe numeric_limits fournit un moyen standard pour rechercher des propriétés différentes 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'intermédiaire des spécialisations du modèle numeric_limits. La bibliothèque standard permet spécialisations 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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      Déclaré dans l'en-tête <limits>
      template<>class numeric_limits<bool>;

      template<>class numeric_limits<char>;
      template<>class numeric_limits<signedchar>;
      template<>class numeric_limits<unsignedchar>;
      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<unsignedshort>;
      template<>class numeric_limits<int>;
      template<>class numeric_limits<unsignedint>;
      template<>class numeric_limits<long>;
      template<>class numeric_limits<unsignedlong>;
      template<>class numeric_limits<longlong>;
      template<>class numeric_limits<unsignedlonglong>;
      template<>class numeric_limits<float>;
      template<>class numeric_limits<double>;

      template<>class numeric_limits<longdouble>;
      En outre, une spécialisation existe pour chaque version de cv-qualifié de chaque type fondamental, identique à la spécialisation sans réserve, par exemple, std::numeric_limits<const int>, std::numeric_limits<volatile int> et std::numeric_limits<const volatile int> sont fournis et sont équivalentes à 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 bibliothèques standards qui sont des alias des types fondamentaux (tels que std::size_t ou std::streamsize peut également être consulté avec les caractères 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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      implémentations peuvent fournir des spécialisations de std::numeric_limits de mise en œuvre spécifiques aux types: par ex. GCC fournit. std::numeric_limits<__int128> bibliothèques peuvent ajouter des spécialisations pour la bibliothèque 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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      Sommaire

      [modifier]Constantes membres

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      identifie les types pour lesquels std::numeric_limits est spécialisée
      Original:
      identifies types for which std::numeric_limits is specialized
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      (constante membre statique publique)[edit]
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      identifie les types signés
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      identifies signed types
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      identifie les types entiers
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      identifies integer types
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      identifie les types exacts
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      identifies exact types
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      (constante membre statique publique)[edit]
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      identifie types à virgule flottante qui peuvent représenter la valeur spéciale "infini positif"
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      identifies floating-point types that can represent the special value "positive infinity"
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      (constante membre statique publique)[edit]
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      identifie types à virgule flottante qui peuvent représenter la valeur spéciale "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 à virgule flottante qui peuvent représenter la valeur spéciale "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 utilisé par la dénormalisation du type à virgule flottante
      Original:
      identifies the denormalization style used by the floating-point type
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      (constante membre statique publique)[edit]
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      identifie les types à virgule flottante qui détectent une perte de précision que la perte de dénormalisation plutôt que des résultats inexacts
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      identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
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      (constante membre statique publique)[edit]
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      identifie le type d'arrondi utilisé par le type
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      identifies the rounding style used by the type
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      (constante membre statique publique)[edit]
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      identifie les IEC 559/IEEE 754 types à virgule flottante
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      identifies the IEC 559/IEEE 754 floating-point types
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      (constante membre statique publique)[edit]
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      identifie des types qui représentent un ensemble fini de valeurs
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      identifies types that represent a finite set of values
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      (constante membre statique publique)[edit]
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      identifie les types qui gèrent les débordements avec l'arithmétique modulo
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      identifies types that handle overflows with modulo arithmetic
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      (constante membre statique publique)[edit]
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      nombre de chiffres radix qui peuvent être représentées sans changement
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      number of radix digits that can be represented without change
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      (constante membre statique publique)[edit]
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      nombre de chiffres décimaux qui peuvent être représentées sans changement
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      number of decimal digits that can be represented without change
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      (constante membre statique publique)[edit]
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      ]       (C++11)
      nombre de chiffres décimaux nécessaires pour différencier 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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      (constante membre statique publique)[edit]
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      la base ou la base utilisée par nombre entier de la représentation du type donné
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      the radix or integer base used by the representation of the given type
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      (constante membre statique publique)[edit]
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      un de plus que la plus petite puissance négative de la racine qui est valide normalisé valeur à 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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      (constante membre statique publique)[edit]
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      la plus petite puissance négative de dix qui est valide normalisé valeur à virgule flottante
      Original:
      the smallest negative power of ten that is a valid normalized floating-point value
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      (constante membre statique publique)[edit]
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      un de plus que la plus grande puissance entière de la racine qui est valide finie valeur à 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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      (constante membre statique publique)[edit]
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      la plus grande puissance entière de 10 qui est valide finie valeur à virgule flottante
      Original:
      the largest integer power of 10 that is a valid finite floating-point value
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      (constante membre statique publique)[edit]
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      identifie les types qui peuvent causer des opérations arithmétiques à piéger
      Original:
      identifies types which can cause arithmetic operations to trap
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      (constante membre statique publique)[edit]
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      identifie types à virgule flottante qui détectent tinyness avant arrondis
      Original:
      identifies floating-point types that detect tinyness before rounding
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      (constante membre statique publique)[edit]

      [modifier]Fonctions membres

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      renvoie la plus petite valeur finie du type donné
      Original:
      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 donné
      Original:
      returns the lowest finite value of the given type
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      (fonction membre publique statique)[edit]
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      renvoie la plus grande valeur finie du type donné
      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 différence entre 1.0 et la prochaine valeur représentable de la donnée à 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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      (fonction membre publique statique)[edit]
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      retourne l'erreur d'arrondi maximum de la donnée à 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 donnée à 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 donnée à virgule flottante de type
      Original:
      returns a quiet NaN value of the given floating-point type
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      (fonction membre publique statique)[edit]
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      renvoie une valeur NaN de signalisation de la donnée à 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 inférieure à la normale de la donnée à 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]

      [modifier]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 dénormalisation à virgule flottante
      Original:
      indicates floating-point denormalization modes
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      (enum)[edit]

      [modifier]Relations avec les constantes C macro bibliothèque

      Specialization Members
      min()lowest()
      (C++11)      		max()epsilon()digitsdigits10min_exponentmin_exponent10max_exponentmax_exponent10radix
      numeric_limits< bool >2
      numeric_limits< char >CHAR_MINCHAR_MINCHAR_MAX2
      numeric_limits< signedchar >SCHAR_MINSCHAR_MINSCHAR_MAX2
      numeric_limits< unsignedchar >​0​​0​UCHAR_MAX2
      numeric_limits< wchar_t >WCHAR_MINWCHAR_MINWCHAR_MAX2
      numeric_limits< char16_t >​0​​0​UINT_LEAST16_MAX2
      numeric_limits< char32_t >​0​​0​UINT_LEAST32_MAX2
      numeric_limits< short >SHRT_MINSHRT_MINSHRT_MAX2
      numeric_limits< signedshort >
      numeric_limits< unsignedshort >​0​​0​USHRT_MAX2
      numeric_limits< int >INT_MININT_MININT_MAX2
      numeric_limits< signedint >
      numeric_limits< unsignedint >​0​​0​UINT_MAX2
      numeric_limits< long >LONG_MINLONG_MINLONG_MAX2
      numeric_limits< signedlong >
      numeric_limits< unsignedlong >​0​​0​ULONG_MAX2
      numeric_limits< longlong >LLONG_MINLLONG_MINLLONG_MAX2
      numeric_limits< signedlonglong >
      numeric_limits< unsignedlonglong >​0​​0​ULLONG_MAX2
      numeric_limits< float >FLT_MIN-FLT_MAXFLT_MAXFLT_EPSILONFLT_MANT_DIGFLT_DIGFLT_MIN_EXPFLT_MIN_10_EXPFLT_MAX_EXPFLT_MAX_10_EXPFLT_RADIX
      numeric_limits< double >DBL_MIN-DBL_MAXDBL_MAXDBL_EPSILONDBL_MANT_DIGDBL_DIGDBL_MIN_EXPDBL_MIN_10_EXPDBL_MAX_EXPDBL_MAX_10_EXPFLT_RADIX
      numeric_limits< longdouble >LDBL_MIN-LDBL_MAXLDBL_MAXLDBL_EPSILONLDBL_MANT_DIGLDBL_DIGLDBL_MIN_EXPLDBL_MIN_10_EXPLDBL_MAX_EXPLDBL_MAX_10_EXPFLT_RADIX

      [modifier]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';}

      Résultat possible : 

      type lowest highest int -2147483648 2147483647 float -3.40282e+38 3.40282e+38 double -1.79769e+308 1.79769e+308
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/types/numeric_limits&oldid=49626 »
      close