std::numeric_limits::is_modulo

 

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Grundtypen Original: Basic types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Grundtypen
Feste Breite Integer-Typen(C++11)
ptrdiff_t size_t max_align_t (C++11)	nullptr_t (C++11) offsetof NULL
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numeric_limits
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std::numeric_limits

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numeric_limits::is_specialized

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numeric_limits::is_modulo

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staticconstbool is_modulo		(bis C + +11)
staticconstexprbool is_modulo		(seit C++11)

The value of std::numeric_limits<T>::is_modulo is true for all arithmetic types T that handle overflows with modulo arithmetic, that is, if the result of addition, subtraction, multiplication, or division of this type would fall outside the range [min(), max()], the value returned by such operation differs from the expected value by a multiple of max()-min()+1.

Standard Spezialisierungen

T	Wert std::numeric_limits<T>::is_modulo Original: value of std::numeric_limits<T>::is_modulo The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
/* non-specialized */	false
bool	false
char	true
signedchar	true
unsignedchar	true
wchar_t	true
char16_t	true
char32_t	true
short	true
unsignedshort	true
int	true
unsignedint	true
long	true
unsignedlong	true
longlong	true
unsignedlonglong	true
float	false
double	false
longdouble	false

Beispiel

Demonstrates the behavior of modulo types

#include <iostream>#include <type_traits>#include <limits>   template<class T>typenamestd::enable_if<std::numeric_limits<T>::is_modulo>::type check_overflow(){std::cout<<"\nmax value is "<<std::numeric_limits<T>::max()<<'\n'<<"min value is "<<std::numeric_limits<T>::min()<<'\n'<<"max value + 1 is "<<std::numeric_limits<T>::max()+1<<'\n';}   int main(){ check_overflow<int>(); check_overflow<unsignedlong>();// check_overflow<float>(); // compile-time error, not a modulo type}

Output:

max value is 2147483647 min value is -2147483648 max value + 1 is -2147483648   max value is 18446744073709551615 min value is 0 max value + 1 is 0

Siehe auch

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)
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)
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)