std::numeric_limits::lowest

From cppreference.com


static constexpr T lowest()		(since C++11)

Returns the lowest finite value representable by the numeric type T, that is, a finite value x such that there is no other finite value y where y < x. This is different from std::numeric_limits<T>::min() for floating-point types. Only meaningful for bounded types.


`T`	std::numeric_limits<T>::lowest()

/* non-specialized */	`T();`

bool	false

char	CHAR_MIN

signed char	SCHAR_MIN

unsigned char	0

wchar_t	WCHAR_MIN

char16_t	0

char32_t	0

short	SHRT_MIN

unsigned short	0

int	INT_MIN

unsigned int	0

long	LONG_MIN

unsigned long	0

long long	LLONG_MIN

unsigned long long	0

float	-FLT_MAX

double	-DBL_MAX

long double	-LDBL_MAX

[edit] Notes

While it's not true for fundamental C++ floating-poing types, a third-party floating-point type T may exist such that std::numeric_limits<T>::lowest() != -std::numeric_limits<T>::max().

[edit] Exceptions

noexcept specification:


noexcept

(since C++11)

[edit] Example

Demonstrates min, max, and lowest for floating-point types

#include <limits>
#include <iostream>
int main()
{
 
    std::cout << "std::numeric_limits<T>::min():\n"
              << "\tfloat: " << std::numeric_limits<float>::min()
              << " or " << std::hexfloat << std::numeric_limits<float>::min() << '\n'
              << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::min()
              << " or " << std::hexfloat << std::numeric_limits<double>::min() << '\n';
    std::cout << "std::numeric_limits<T>::lowest():\n"
              << "\tfloat: " << std::defaultfloat << std::numeric_limits<float>::lowest()
              << " or " << std::hexfloat << std::numeric_limits<float>::lowest() << '\n'
              << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::lowest()
              << " or " << std::hexfloat << std::numeric_limits<double>::lowest() << '\n';
    std::cout << "std::numeric_limits<T>::max():\n"
              << "\tfloat: " << std::defaultfloat << std::numeric_limits<float>::max()
              << " or " << std::hexfloat << std::numeric_limits<float>::max() << '\n'
              << "\tdouble: " << std::defaultfloat << std::numeric_limits<double>::max()
              << " or " << std::hexfloat << std::numeric_limits<double>::max() << '\n';
}

Output:

std::numeric_limits<T>::min():
        float: 1.17549e-38 or 0x1p-126
        double: 2.22507e-308 or 0x1p-1022
std::numeric_limits<T>::lowest():
        float: -3.40282e+38 or -0x1.fffffep+127
        double: -1.79769e+308 or -0x1.fffffffffffffp+1023
std::numeric_limits<T>::max():
        float: 3.40282e+38 or 0x1.fffffep+127
        double: 1.79769e+308 or 0x1.fffffffffffffp+1023

[edit] See also


min [static]	returns the smallest finite value of the given type (public static member function)

denorm_min [static]	returns the smallest positive subnormal value of the given floating-point type (public static member function)

max [static]	returns the largest finite value of the given type (public static member function)

Language
Concepts
Utilities library
Strings library
Containers library
Algorithms library
Iterators library
Numerics library
Input/output library
Localizations library
Regular expressions library (C++11)
Atomic operations library (C++11)
Thread support library (C++11)

std::numeric_limits::lowest

Contents

[edit] Return value

[edit] Notes

[edit] Exceptions

[edit] Example

[edit] See also