std::rank

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C++
 
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_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
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
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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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Type modifications
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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)
Digitare costanti tratto
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Type trait constants
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integral_constant(C++11)
 
Elemento definito nell'header <type_traits>
template<class T >
struct rank;
(dal C++11)

If T is an array type, provides the member constant value equal to the number of dimensions of the array. For any other type, value is 0.

Indice

Inherited from std::integral_constant

Member constants

value
[statico]
 the number of dimensions of T or zero
(pubblico membro statico costante)

Member functions

operator std::size_t
converte l'oggetto in std::size_t, restituisce value
Original:
converts the object to std::size_t, returns value
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(metodo pubblico)

Member types

Tipo
Original:
Type
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 Definition
value_typestd::size_t
typestd::integral_constant<std::size_t, value>

[modifica]Possibile implementazione

template<class T>struct rank :std::integral_constant<std::size_t, 0>{};   template<class T>struct rank<T[]>:publicstd::integral_constant<std::size_t, rank<T>::value+1>{};   template<class T, size_t N>struct rank<T[N]>:publicstd::integral_constant<std::size_t, rank<T>::value+1>{};

[modifica]Esempio

#include <iostream>#include <type_traits>   int main(){std::cout<< std::rank<int[1][2][3]>::value<<'\n';std::cout<< std::rank<int[][2][3][4]>::value<<'\n';std::cout<< std::rank<int>::value<<'\n';}

Output: 

3 4 0

[modifica]Vedi anche

(C++11)
Verifica se un tipo è un tipo di matrice
Original:
checks if a type is an array type
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(classe template)[modifica]
(C++11)
ottiene la dimensione di un tipo di matrice lungo una dimensione specificata
Original:
obtains the size of an array type along a specified dimension
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(classe template)[modifica]
(C++11)
rimuove una misura dal tipo di matrice specificato
Original:
removes one extent from the given array type
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(classe template)[modifica]
(C++11)
 removes all extents from the given array type
(classe template)[modifica]
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