std::numeric_limits<T>::round_error
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< cpp | types | numeric limits
C++
Utilities library
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Type support
Basic types | |||||||||||||||||||||
Fixed width integer types (C++11) | |||||||||||||||||||||
Fixed width floating-point types (C++23) | |||||||||||||||||||||
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Numeric limits | |||||||||||||||||||||
C numeric limits interface | |||||||||||||||||||||
Runtime type information | |||||||||||||||||||||
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std::numeric_limits
Static constants | ||||
(C++11)
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Static member functions | ||||
(C++11)
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numeric_limits::round_error | ||||
Helper types | ||||
static T round_error(
)
throw
(
)
;
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(until C++11) | |
static constexpr T round_error() noexcept;
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(since C++11) | |
Returns the largest possible rounding error in ULPs (units in the last place) as defined by ISO 10967, which can vary from 0.5 (rounding to the nearest digit) to 1.0 (rounding to zero or to infinity). It is only meaningful if std::numeric_limits <T> :: is_integer == false
Return value
T
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std::numeric_limits <T> :: round_error ( ) |
/* non-specialized */ | T() |
bool | false |
char | 0 |
signed char | 0 |
unsigned char | 0 |
wchar_t | 0 |
char8_t (since C++20) | 0 |
char16_t (since C++11) | 0 |
char32_t (since C++11) | 0 |
short | 0 |
unsigned short | 0 |
int | 0 |
unsigned int | 0 |
long | 0 |
unsigned long | 0 |
long long (since C++11) | 0 |
unsigned long long (since C++11) | 0 |
float | 0.5F |
double | 0.5 |
long double | 0.5L |
See also
[static]
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identifies the rounding style used by the type (public static member constant) |