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    std::numeric_limits

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    C++
     
    Utilities-Bibliothek
     
    Geben Sie Unterstützung
    Grundtypen
    Original:
    Basic types
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    Grundtypen
    Feste Breite Integer-Typen (C++11)
    Numerische Grenzen
    Original:
    Numeric limits
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    numeric_limits
    C numerische begrenzt Schnittstelle
    Laufzeit-Typinformationen
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    Runtime type information
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    Exterieur
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    Type traits
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    Primären Typ Kategorien
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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_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)
    Typ Eigenschaften
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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)
    Unterstützte Operationen
    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)
    Beziehungen und Eigentum Abfragen
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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)
    Typ Modifikationen
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    Type modifications
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    Typ Transformationen
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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)
    Typ-Trait-Konstanten
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    Type trait constants
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    integral_constant(C++11)
     
    std::numeric_limits
    Statische Konstanten
    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
    Statische Member-Funktionen
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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
    Helper-Typen
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    Helper types
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    float_round_style
    float_denorm_style
     
    definiert in Header <limits>
    template< class T > class numeric_limits;
    Die numeric_limits Klassen-Template bietet eine standardisierte Möglichkeit, um verschiedene Eigenschaften von grundlegender Typen (zB den größtmöglichen Wert für Typ int ist std::numeric_limits<int>::max()) abzufragen .
    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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    Diese Information wird über Spezialisierungen der numeric_limits Schablone. Die Standard-Bibliothek zur Verfügung stellt Spezialisierungen für alle Grundtypen:
    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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    definiert 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>;
    Darüber hinaus besteht eine Spezialisierung für jeden cv qualifizierte Version jeder Grundtypus, identisch mit dem uneingeschränkten Spezialisierung, z. B. std::numeric_limits<const int>, std::numeric_limits<volatile int> und std::numeric_limits<const volatile int> vorgesehen und entsprechen 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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    Die Standard-Bibliothek-Typen, die Aliase grundlegende Typen (wie std::size_t oder std::streamsize kann auch mit den std::numeric_limits Typmerkmale untersucht werden .
    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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    Implementierungen können Spezialisierungen std::numeric_limits für die Implementierung spezifischer Typen anbieten sind:.. ZB GCC bietet std::numeric_limits<__int128> Bibliotheken können hinzuzufügen Spezialisierungen für die Bibliothek bereitgestellten Typen, wandelt zB OpenEXR provides std::numeric_limits<half> für eine 16-Bit-Fließkomma-Typ .
    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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    Inhaltsverzeichnis

    [Bearbeiten] Mitglied Konstanten

    [statisch]
    identifiziert, für die std::numeric_limits spezialisiert ist
    Original:
    identifies types for which std::numeric_limits is specialized
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert unterzeichnet Typen
    Original:
    identifies signed types
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert Integer-Typen
    Original:
    identifies integer types
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert genauen Typen
    Original:
    identifies exact types
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert Floating-Point-Typen, die den besonderen Wert "positive Unendlichkeit" darstellen kann
    Original:
    identifies floating-point types that can represent the special value "positive infinity"
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert Floating-Point-Typen, die den besonderen Wert "quiet not-a-number" (NaN) darstellen kann
    Original:
    identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert Floating-Point-Typen, die den besonderen Wert "Signalisierung not-a-number" (NaN) darstellen kann
    Original:
    identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert die Denormalisierung Stil durch den Floating-Point-Typ verwendet
    Original:
    identifies the denormalization style used by the floating-point type
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    (public static Mitglied konstanten) [edit]
    [statisch]
    		identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert die Rundung Stil vom Typ verwendet
    Original:
    identifies the rounding style used by the type
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert die IEC 559/IEEE 754 Floating-Point-Typen
    Original:
    identifies the IEC 559/IEEE 754 floating-point types
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    (public static Mitglied konstanten) [edit]
    [statisch]
    		identifies types that represent a finite set of values
    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert Typen, die Überläufe Griff mit Modulo-Arithmetik
    Original:
    identifies types that handle overflows with modulo arithmetic
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    (public static Mitglied konstanten) [edit]
    [statisch]
    Anzahl von Ziffern, die radix unverändert dargestellt werden kann
    Original:
    number of radix digits that can be represented without change
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    (public static Mitglied konstanten) [edit]
    [statisch]
    Anzahl der Dezimalstellen, die ohne Änderung dargestellt werden können
    Original:
    number of decimal digits that can be represented without change
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    (public static Mitglied konstanten) [edit]
    [statisch] (C++11)
    Anzahl der Dezimalstellen nötig, um alle Werte dieses Typs zu unterscheiden
    Original:
    number of decimal digits necessary to differentiate all values of this type
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    (public static Mitglied konstanten) [edit]
    [statisch]
    die Radix oder Integer Basis durch die Darstellung des angegebenen Typs verwendet
    Original:
    the radix or integer base used by the representation of the given type
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    (public static Mitglied konstanten) [edit]
    [statisch]
    eine mehr als die kleinste negative Macht des Radix, die eine gültige normalisierten Gleitkomma-Wert ist
    Original:
    one more than the smallest negative power of the radix that is a valid normalized floating-point value
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    (public static Mitglied konstanten) [edit]
    [statisch]
    das kleinste negative Zehnerpotenz, die eine gültige normalisierten Gleitkomma-Wert ist
    Original:
    the smallest negative power of ten that is a valid normalized floating-point value
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    (public static Mitglied konstanten) [edit]
    [statisch]
    eine mehr als die größte ganze Macht der radix, die eine gültige endlichen Floating-Point-Wert ist
    Original:
    one more than the largest integer power of the radix that is a valid finite floating-point value
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    (public static Mitglied konstanten) [edit]
    [statisch]
    die größte ganzzahlige Potenz von 10, die eine gültige endlichen Floating-Point-Wert ist
    Original:
    the largest integer power of 10 that is a valid finite floating-point value
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    (public static Mitglied konstanten) [edit]
    [statisch]
    Typen identifiziert, die dazu führen, um arithmetische Operationen einfangen kann
    Original:
    identifies types which can cause arithmetic operations to trap
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    (public static Mitglied konstanten) [edit]
    [statisch]
    identifiziert Floating-Point-Typen, die tinyness erkennen, bevor Rundungen
    Original:
    identifies floating-point types that detect tinyness before rounding
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    (public static Mitglied konstanten) [edit]

    [Bearbeiten] Member-Funktionen

    [statisch]
    gibt den kleinsten endlichen Wert des angegebenen Typs
    Original:
    returns the smallest finite value of the given type
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    (public static Elementfunktion) [edit]
    [statisch] (C++11)
    Gibt den niedrigsten endlichen Wert des angegebenen Typs
    Original:
    returns the lowest finite value of the given type
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    (public static Elementfunktion) [edit]
    [statisch]
    liefert den größten endlichen Wert des angegebenen Typs
    Original:
    returns the largest finite value of the given type
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    (public static Elementfunktion) [edit]
    [statisch]
    gibt die Differenz zwischen dem nächsten und 1.0 darstellbare Wert der gegebenen Gleitkommatyp
    Original:
    returns the difference between 1.0 and the next representable value of the given floating-point type
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    (public static Elementfunktion) [edit]
    [statisch]
    gibt die maximale Rundungsfehler der gegebenen Fließkomma-Typ
    Original:
    returns the maximum rounding error of the given floating-point type
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    (public static Elementfunktion) [edit]
    [statisch]
    gibt die positive infinity Wert der gegebenen Fließkomma-Typ
    Original:
    returns the positive infinity value of the given floating-point type
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    (public static Elementfunktion) [edit]
    [statisch]
    gibt einen ruhigen NaN Wert der gegebenen Fließkomma-Typ
    Original:
    returns a quiet NaN value of the given floating-point type
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    (public static Elementfunktion) [edit]
    [statisch]
    gibt ein Signal NaN Wert der gegebenen Fließkomma-Typ
    Original:
    returns a signaling NaN value of the given floating-point type
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    (public static Elementfunktion) [edit]
    [statisch]
    gibt die kleinste positive subnormal Wert der gegebenen Fließkomma-Typ
    Original:
    returns the smallest positive subnormal value of the given floating-point type
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    (public static Elementfunktion) [edit]

    [Bearbeiten] Helper-Klassen

    zeigt Gleitkommazahl Rundungsmodi
    Original:
    indicates floating-point rounding modes
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    (enum) [edit]
    zeigt Floating-Point-Denormalisierung Modi
    Original:
    indicates floating-point denormalization modes
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    (enum) [edit]

    [Bearbeiten] Beziehung mit C-Bibliothek Makro-Konstanten

    SpecializationMembers
    min()lowest()
    (C++11)    		max()epsilon()digitsdigits10min_exponentmin_exponent10max_exponentmax_exponent10radix
    numeric_limits<bool>2
    numeric_limits<char>CHAR_MINCHAR_MINCHAR_MAX2
    numeric_limits<signed char>SCHAR_MINSCHAR_MINSCHAR_MAX2
    numeric_limits<unsigned char>​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<signed short>
    numeric_limits<unsigned short>​0​​0​USHRT_MAX2
    numeric_limits<int>INT_MININT_MININT_MAX2
    numeric_limits<signed int>
    numeric_limits<unsigned int>​0​​0​UINT_MAX2
    numeric_limits<long>LONG_MINLONG_MINLONG_MAX2
    numeric_limits<signed long>
    numeric_limits<unsigned long>​0​​0​ULONG_MAX2
    numeric_limits<long long>LLONG_MINLLONG_MINLLONG_MAX2
    numeric_limits<signed long long>
    numeric_limits<unsigned long long>​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<long double>LDBL_MIN-LDBL_MAXLDBL_MAXLDBL_EPSILONLDBL_MANT_DIGLDBL_DIGLDBL_MIN_EXPLDBL_MIN_10_EXPLDBL_MAX_EXPLDBL_MAX_10_EXPFLT_RADIX

    [Bearbeiten] Beispiel

    #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
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/types/numeric_limits&oldid=28189“