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std::numeric_limits::min

Da cppreference.com.

 
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Tipo di supporto
Tipi base
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Basic types
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Tipi fondamentali
Larghezza fissa interi tipi (C++11)
Limiti numerici
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Numeric limits
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numeric_limits
C numerico limita interfaccia
Informazioni sul tipo di runtime
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Runtime type information
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Tipo tratti
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Type traits
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Categorie di tipo primario
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Primary type categories
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is_void(C++11)
is_array(C++11)
is_pointer(C++11)
is_enum(C++11)
is_union(C++11)
is_class(C++11)
is_function(C++11)
is_object(C++11)
is_scalar(C++11)
is_compound(C++11)
is_integral(C++11)
is_floating_point(C++11)
is_fundamental(C++11)
is_arithmetic(C++11)
is_reference(C++11)
is_lvalue_reference(C++11)
is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Proprietà del tipo
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Type properties
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is_const(C++11)
is_volatile(C++11)
is_pod(C++11)
is_empty(C++11)
is_polymorphic(C++11)
is_abstract(C++11)
Operazioni supportate
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Supported operations
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is_constructible
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is_nothrow_constructible
(C++11)
(C++11)
(C++11)
is_default_constructible
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is_nothrow_default_constructible
(C++11)
(C++11)
(C++11)
is_copy_constructible
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(C++11)
(C++11)
(C++11)
is_move_constructible
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is_nothrow_move_constructible
(C++11)
(C++11)
(C++11)
is_assignable
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(C++11)
(C++11)
(C++11)
is_copy_assignable
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(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable
(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible
(C++11)
(C++11)
(C++11)
has_virtual_destructor(C++11)
I rapporti e le query di proprietà
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
Tipo modifiche
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remove_cv
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(C++11)
(C++11)
(C++11)
add_cv
add_const
add_volatile
(C++11)
(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
Tipo di trasformazioni
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
Digitare costanti tratto
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Type trait constants
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integral_constant(C++11)
 
 
static T min()
(C fino + 11)
static constexpr T min()
(dal C++11)
Restituisce il minimo rappresentabile valore finito dal T tipo numerico. Per i tipi di punti di galleggiante con denormalizzazione restituisce il minimo valore positivo normalizzato. Significativo solo per tipi delimitate e per illimitati tipi senza segno, cioè i tipi che rappresentano un insieme infinito di valori negativi hanno alcun minimo significativo.
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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Indice

[modifica] Valore di ritorno

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

[modifica] Eccezioni

noexcept specification:  
noexcept
  (dal C++11)

[modifica] Esempio

Dimostra l'uso con i tipi typedef, e la differenza nel segno del risultato tra tipi interi e virgola mobile
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

[modifica] Vedi anche

[statico] (C++11)
restituisce il valore più basso finito del tipo specificato
Original:
returns the lowest finite value of the given type
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(public static membro funzione) [edit]
[statico]
restituisce il più piccolo valore positivo subnormale di un dato tipo a virgola mobile
Original:
returns the smallest positive subnormal value of the given floating-point type
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(public static membro funzione) [edit]
[statico]
restituisce il più grande valore finito del tipo specificato
Original:
returns the largest finite value of the given type
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(public static membro funzione) [edit]