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std::numeric_limits::min

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std::numeric_limits
 
static T min()
(hasta C++11)
static constexpr T min()
(desde C++11)
Devuelve el valor mínimo representable finito por el T tipo numérico. Para los tipos de punto flotante con desnormalización devuelve el mínimo valor normalizado positivo. Sólo tiene sentido para los tipos delimitadas y sin límites para los tipos sin signo, es decir, tipos que representan un conjunto infinito de valores negativos no tienen ningún sentido mínimo .
Original:
Returns the minimum finite value representable by the numeric type T. For floating point types with denormalization returns the minimum positive normalized value. Only meaningful for bounded types and for unbounded unsigned types, that is, types that represent an infinite set of negative values have no meaningful minimum.
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Contenido

[editar] Valor de retorno

T std::numeric_limits<T>::min()
/* 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_MIN
double DBL_MIN
long double LDBL_MIN

[editar] Excepciones

noexcept specification:  
noexcept
  (desde C++11)

[editar] Ejemplo

Muestra el uso de tipos typedef, y la diferencia en el signo del resultado entre los tipos enteros y de punto flotante
Original:
Demonstrates the use with typedef types, and the difference in the sign of the result between integer and floating-point types
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#include <limits>
#include <cstddef>
#include <iostream>
int main()
{
    std::cout << "short: " << std::dec << std::numeric_limits<short>::min()
              << " or " << std::hex << std::showbase << std::numeric_limits<short>::min() << '\n'
              << "int: " << std::dec << std::numeric_limits<int>::min() << std::showbase
              << " or " << std::hex << std::numeric_limits<int>::min() << '\n' << std::dec 
              << "ptrdiff_t: " << std::numeric_limits<std::ptrdiff_t>::min() << std::showbase
              << " or " << std::hex << std::numeric_limits<std::ptrdiff_t>::min() << '\n'
              << "float: " << std::numeric_limits<float>::min()
              << " or " << std::hexfloat << std::numeric_limits<float>::min() << '\n'
              << "double: " << std::defaultfloat << std::numeric_limits<double>::min()
              << " or " << std::hexfloat << std::numeric_limits<double>::min() << '\n';
}

Output:

short: -32768 or 0x8000
int: -2147483648 or 0x80000000
ptrdiff_t: -9223372036854775808 or 0x8000000000000000
float: 1.17549e-38 or 0x1p-126
double: 2.22507e-308 or 0x1p-1022

[editar] Ver también

[estático] (C++11)
Devuelve el menor valor finito del tipo dado
Original:
returns the lowest finite value of the given type
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(miembro estático público función) [edit]
[estático]
devuelve el menor valor positivo subnormal de lo dado tipo de punto flotante
Original:
returns the smallest positive subnormal value of the given floating-point type
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(miembro estático público función) [edit]
[estático]
devuelve el mayor valor finito del tipo dado
Original:
returns the largest finite value of the given type
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(miembro estático público función) [edit]