static constexpr T lowest() noexcept; | (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 |
| char8_t (since C++20) | 0 |
| 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 |
For every standard C++ floating-point type T std::numeric_limits<T>::lowest() == -std::numeric_limits<T>::max(), but this does not necessarily have to be the case for any third-party specialization.
Demonstrates min(), max(), and lowest() for floating-point types:
#include <iostream>
#include <limits>
#include <string_view>
template<typename T>
void print_twice(std::string_view type, T value)
{
std::cout << '\t' << type << ": "
<< std::defaultfloat << value << " or "
<< std::hexfloat << value << '\n';
}
int main()
{
// min()
std::cout << "std::numeric_limits<T>::min():\n";
print_twice("float", std::numeric_limits<float>::min());
print_twice("double", std::numeric_limits<double>::min());
print_twice("long double", std::numeric_limits<long double>::min());
// lowest()
std::cout << "std::numeric_limits<T>::lowest():\n";
print_twice("float", std::numeric_limits<float>::lowest());
print_twice("double", std::numeric_limits<double>::lowest());
print_twice("long double", std::numeric_limits<long double>::lowest());
// max()
std::cout << "std::numeric_limits<T>::max():\n";
print_twice("float", std::numeric_limits<float>::max());
print_twice("double", std::numeric_limits<double>::max());
print_twice("long double", std::numeric_limits<long double>::max());
}Output:
std::numeric_limits<T>::min():
float: 1.17549e-38 or 0x1p-126
double: 2.22507e-308 or 0x1p-1022
long double: 3.3621e-4932 or 0x8p-16385
std::numeric_limits<T>::lowest():
float: -3.40282e+38 or -0x1.fffffep+127
double: -1.79769e+308 or -0x1.fffffffffffffp+1023
long double: -1.18973e+4932 or -0xf.fffffffffffffffp+16380
std::numeric_limits<T>::max():
float: 3.40282e+38 or 0x1.fffffep+127
double: 1.79769e+308 or 0x1.fffffffffffffp+1023
long double: 1.18973e+4932 or 0xf.fffffffffffffffp+16380|
[static] | returns the smallest finite value of the given type (public static member function) |
|
[static] | returns the smallest positive subnormal value of the given floating-point type (public static member function) |
|
[static] | returns the largest finite value of the given type (public static member function) |
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