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std::numeric_limits – cppreference.com

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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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Mitglied Konstanten


is_specialized [statisch]	identifiziert, für die std::numeric_limits spezialisiert ist Original: identifies types for which std::numeric_limits is specialized The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

is_signed [statisch]	identifiziert unterzeichnet Typen Original: identifies signed types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

is_integer [statisch]	identifiziert Integer-Typen Original: identifies integer types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

is_exact [statisch]	identifiziert genauen Typen Original: identifies exact types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

has_infinity [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" The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

has_quiet_NaN [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) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

has_signaling_NaN [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) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

has_denorm [statisch]	identifiziert die Denormalisierung Stil durch den Floating-Point-Typ verwendet Original: identifies the denormalization style used by the floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

has_denorm_loss [statisch]	identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result (public static Mitglied konstanten) [edit]

round_style [statisch]	identifiziert die Rundung Stil vom Typ verwendet Original: identifies the rounding style used by the type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

is_iec559 [statisch]	identifiziert die IEC 559/IEEE 754 Floating-Point-Typen Original: identifies the IEC 559/IEEE 754 floating-point types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

is_bounded [statisch]	identifies types that represent a finite set of values (public static Mitglied konstanten) [edit]

is_modulo [statisch]	identifiziert Typen, die Überläufe Griff mit Modulo-Arithmetik Original: identifies types that handle overflows with modulo arithmetic The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

digits [statisch]	Anzahl von Ziffern, die `radix` unverändert dargestellt werden kann Original: number of `radix` digits that can be represented without change The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

digits10 [statisch]	Anzahl der Dezimalstellen, die ohne Änderung dargestellt werden können Original: number of decimal digits that can be represented without change The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

max_digits10 [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

radix [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

min_exponent [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

min_exponent10 [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

max_exponent [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

max_exponent10 [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

traps [statisch]	Typen identifiziert, die dazu führen, um arithmetische Operationen einfangen kann Original: identifies types which can cause arithmetic operations to trap The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

tinyness_before [statisch]	identifiziert Floating-Point-Typen, die tinyness erkennen, bevor Rundungen Original: identifies floating-point types that detect tinyness before rounding The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) [edit]

Member-Funktionen


min [statisch]	gibt den kleinsten endlichen Wert des angegebenen Typs Original: returns the smallest finite value of the given type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

lowest [statisch] (C++11)	Gibt den niedrigsten endlichen Wert des angegebenen Typs Original: returns the lowest finite value of the given type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

max [statisch]	liefert den größten endlichen Wert des angegebenen Typs Original: returns the largest finite value of the given type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

epsilon [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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

round_error [statisch]	gibt die maximale Rundungsfehler der gegebenen Fließkomma-Typ Original: returns the maximum rounding error of the given floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

infinity [statisch]	gibt die positive infinity Wert der gegebenen Fließkomma-Typ Original: returns the positive infinity value of the given floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

quiet_NaN [statisch]	gibt einen ruhigen NaN Wert der gegebenen Fließkomma-Typ Original: returns a quiet NaN value of the given floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

signaling_NaN [statisch]	gibt ein Signal NaN Wert der gegebenen Fließkomma-Typ Original: returns a signaling NaN value of the given floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

denorm_min [statisch]	gibt die kleinste positive subnormal Wert der gegebenen Fließkomma-Typ Original: returns the smallest positive subnormal value of the given floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Elementfunktion) [edit]

Helper-Klassen


	zeigt Gleitkommazahl Rundungsmodi Original: indicates floating-point rounding modes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (enum) [edit]

	zeigt Floating-Point-Denormalisierung Modi Original: indicates floating-point denormalization modes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (enum) [edit]

Beziehung mit C-Bibliothek Makro-Konstanten

Specialization	Members
Specialization	`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_>`	SHRT_MIN	SHRT_MIN	SHRT_MAX								`2`
`_{numeric_limits<}unsigned short_>`	`0`	`0`	USHRT_MAX								`2`
`_{numeric_limits<}int_>`	INT_MIN	INT_MIN	INT_MAX								`2`
`_{numeric_limits<}signed int_>`	INT_MIN	INT_MIN	INT_MAX								`2`
`_{numeric_limits<}unsigned int_>`	`0`	`0`	UINT_MAX								`2`
`_{numeric_limits<}long_>`	LONG_MIN	LONG_MIN	LONG_MAX								`2`
`_{numeric_limits<}signed long_>`	LONG_MIN	LONG_MIN	LONG_MAX								`2`
`_{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_>`	LLONG_MIN	LLONG_MIN	LLONG_MAX								`2`
`_{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

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