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std::numeric_limits::denorm_min

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std::numeric_limits
 
static T denorm_min()
(até C + 11)
static constexpr T denorm_min()
(a partir do C++ 11)
Retorna o valor subnormal positiva mínima do T tipo, se std::numeric_limits<T>::has_denorm != std::denorm_absent, caso contrário retorna std::numeric_limits<T>::min(). Só faz sentido para tipos de ponto flutuante.
Original:
Returns the minimum positive valor subnormal of the type T, if std::numeric_limits<T>::has_denorm != std::denorm_absent, otherwise returns std::numeric_limits<T>::min(). Only meaningful for floating-point types.
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Índice

[editar] Valor de retorno

T std::numeric_limits<T>::denorm_min()
/* non-specialized */ T();
bool false
char 0
signed char 0
unsigned char 0
wchar_t 0
char16_t 0
char32_t 0
short 0
unsigned short 0
int 0
unsigned int 0
long 0
unsigned long 0
long long 0
unsigned long long 0
float 2-149
if std::numeric_limits<float>::is_iec559 == true
double 2-1074
if std::numeric_limits<double>::is_iec559 == true
long double
/ * Implementação definida * /
Original:
/* implementation-defined */
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[editar] Exceções

noexcept specification:  
noexcept
  (a partir do C++ 11)

[editar] Exemplo

Demonstates a estrutura subjacente do bit denorm_min ()
Original:
Demonstates the underlying bit structure of the denorm_min()
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#include <cstdint>
#include <limits>
#include <cassert>
int main()
{
    // the smallest subnormal value has sign bit = 0, exponent = 0
    // and only the least significant bit of the fraction is 1
    uint32_t denorm_bits = 0x0001;
    float denorm_float = reinterpret_cast<float&>(denorm_bits);
    assert(denorm_float == std::numeric_limits<float>::denorm_min());
}


[editar] Veja também

[estática]
retorna o menor valor finito do tipo de dado
Original:
returns the smallest finite value of the given type
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(função public static membro) [edit]
[estática]
identifica o estilo desnormalização usado pelo tipo de ponto flutuante
Original:
identifies the denormalization style used by the floating-point type
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(membro estático público constante) [edit]
[estática] (C++11)
retorna o menor valor finito do tipo de dado
Original:
returns the lowest finite value of the given type
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(função public static membro) [edit]