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std::numeric_limits

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< cpp‎ | types

 
 
 
Soutien aux types fondamentaux
Les types de base
Original:
Basic types
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Types fondamentaux
Fixe les types entiers largeur (C++11)
Limites numériques
Original:
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
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)
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
Original:
Type trait constants
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integral_constant (C++11)
 
std::numeric_limits
 
Defined in header <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()) .
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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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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Defined in 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>;
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

[
statique
Original:
static
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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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statique
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static
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identifie les types signés
Original:
identifies signed types
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statique
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static
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identifie les types entiers
Original:
identifies integer types
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statique
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static
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identifie les types exacts
Original:
identifies exact types
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statique
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static
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identifie types à virgule flottante qui peuvent représenter la valeur spéciale "infini positif"
Original:
identifies floating-point types that can represent the special value "positive infinity"
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statique
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static
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identifie types à virgule flottante qui peuvent représenter la valeur spéciale "calme pas-a-number» (NaN)
Original:
identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
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statique
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static
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identifie types à virgule flottante qui peuvent représenter la valeur spéciale "signalisation non-a-number» (NaN)
Original:
identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
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statique
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static
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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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statique
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static
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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
Original:
identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
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statique
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static
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identifie le type d'arrondi utilisé par le type
Original:
identifies the rounding style used by the type
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statique
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static
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identifie les IEC 559/IEEE 754 types à virgule flottante
Original:
identifies the IEC 559/IEEE 754 floating-point types
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statique
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static
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identifie des types qui représentent un ensemble fini de valeurs
Original:
identifies types that represent a finite set of values
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statique
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static
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identifie les types qui gèrent les débordements avec l'arithmétique modulo
Original:
identifies types that handle overflows with modulo arithmetic
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statique
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static
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nombre de chiffres radix qui peuvent être représentées sans changement
Original:
number of radix digits that can be represented without change
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statique
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static
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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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statique
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static
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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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statique
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static
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la base ou la base utilisée par nombre entier de la représentation du type donné
Original:
the radix or integer base used by the representation of the given type
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statique
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static
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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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statique
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static
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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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statique
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static
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un de plus que la plus grande puissance entière de la racine qui est valide finie valeur à virgule flottante
Original:
one more than the largest integer power of the radix that is a valid finite floating-point value
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statique
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static
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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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statique
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static
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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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statique
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static
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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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[modifier] Fonctions membres

[
statique
Original:
static
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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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statique
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static
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(C++11)
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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statique
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static
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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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statique
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static
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renvoie la différence entre 1.0 et la prochaine valeur représentable de la donnée à virgule flottante de type
Original:
returns the difference between 1.0 and the next representable value of the given floating-point type
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statique
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static
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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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statique
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static
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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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statique
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static
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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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statique
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static
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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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statique
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static
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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() 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

[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