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Varianti

std::numeric_limits::traps

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
Original:
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
Original:
Basic types
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Tipi fondamentali
Larghezza fissa interi tipi (C++11)
Limiti numerici
Original:
Numeric limits
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numeric_limits
C numerico limita interfaccia
Informazioni sul tipo di runtime
Original:
Runtime type information
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Tipo tratti
Original:
Type traits
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Categorie di tipo primario
Original:
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
Original:
Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible
(C++11)
(C++11)
(C++11)
is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible
(C++11)
(C++11)
(C++11)
is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible
(C++11)
(C++11)
(C++11)
is_move_constructible
is_trivially_move_constructible
is_nothrow_move_constructible
(C++11)
(C++11)
(C++11)
is_assignable
is_trivially_assignable
is_nothrow_assignable
(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable
(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
Original:
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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Type modifications
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remove_cv
remove_const
remove_volatile
(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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Type transformations
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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
Original:
Type trait constants
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integral_constant(C++11)
 
 
static const bool traps
(C fino + 11)
static constexpr bool traps
(dal C++11)
Il valore di std::numeric_limits<T>::traps è true per tutti i tipi aritmetici T che hanno almeno un valore che, se utilizzato come argomento per un'operazione aritmetica, genererà un trappola.
Original:
The value of std::numeric_limits<T>::traps is true for all arithmetic types T that have at least one value that, if used as an argument to an arithmetic operation, will generate a trappola.
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[modifica] Specializzazioni standard

T
valore di std::numeric_limits<T>::traps
Original:
value of std::numeric_limits<T>::traps
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/* non-specialized */ false
bool false
char
di solito true
Original:
usually true
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signed char
di solito true
Original:
usually true
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unsigned char
di solito true
Original:
usually true
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wchar_t
di solito true
Original:
usually true
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char16_t
di solito true
Original:
usually true
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char32_t
di solito true
Original:
usually true
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short
di solito true
Original:
usually true
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unsigned short
di solito true
Original:
usually true
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int
di solito true
Original:
usually true
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unsigned int
di solito true
Original:
usually true
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long
di solito true
Original:
usually true
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unsigned long
di solito true
Original:
usually true
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long long
di solito true
Original:
usually true
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unsigned long long
di solito true
Original:
usually true
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float
di solito false
Original:
usually false
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double
di solito false
Original:
usually false
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long double
di solito false
Original:
usually false
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[modifica] Note

Sulla maggior parte delle piattaforme divisione intera per zero sempre trappole, e std::numeric_limits<T>::traps è true per tutti i tipi interi che supportano il valore 0. L'eccezione è il bool tipo: anche se la divisione per trappole false a causa di promozione integrale da bool a int, è il valore zero che int trappole. Zero non è un valore di tipo bool.
Original:
On most platforms integer division by zero always traps, and std::numeric_limits<T>::traps is true for all integer types that support the value 0. The exception is the type bool: even though division by false traps due to integral promotion from bool to int, it is the zero-valued int that traps. Zero is not a value of type bool.
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Sulla maggior parte delle piattaforme, eccezioni a virgola mobile può essere attivato e disattivato in fase di esecuzione (ad esempio, su Linux o feenableexcept() _controlfp su Windows), nel qual caso il valore di std::numeric_limits<T>::traps per tipi a virgola mobile riflette lo stato di virgola mobile impianto di cattura a il tempo di avvio del programma, che è false sulla maggior parte dei sistemi moderni. Un'eccezione potrebbe essere un programma DEC Alpha, dove è true se compilato senza -ieee.
Original:
On most platforms, floating-point exceptions may be turned on and off at run time (e.g. feenableexcept() on Linux or _controlfp on Windows), in which case the value of std::numeric_limits<T>::traps for floating-point types reflects the state of floating-point trapping facility at the time of program startup, which is false on most modern systems. An exception would be a DEC Alpha program, where it is true if compiled without -ieee.
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[modifica] Vedi anche

Virgola mobile ambiente
identifica i tipi a virgola mobile che rilevano tinyness prima dell'arrotondamento
Original:
identifies floating-point types that detect tinyness before rounding
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(pubblico membro statico costante) [edit]
identifies the floating-point types that detect loss of precision as denormalization loss rather than inexact result
(pubblico membro statico costante) [edit]