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std::numeric_limits

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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_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)
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
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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)
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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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)
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)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
Typ-Trait-Konstanten
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Type trait constants
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integral_constant(C++11)
 
std::numeric_limits
 
Defined 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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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>;
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]
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]
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]
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

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

[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