std::remove_extent

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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
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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
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Swap, forward and move
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swap
forward(C++11)
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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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C numerico limita interfaccia
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Tipo tratti
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Categorie di tipo primario
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is_void(C++11)
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Type properties
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is_const(C++11)
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Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible		(C++11)
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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
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is_nothrow_move_constructible		(C++11)
(C++11)
(C++11)
is_assignable
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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)
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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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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 remove_extent;
(dal C++11)
Se T è un array di qualche X tipo, fornisce l'elemento di typedef type pari a X, altrimenti type è T. Si noti che se T è una matrice multidimensionale, solo la prima dimensione è stato rimosso.
Original:
If T is an array of some type X, provides the member typedef type equal to X, otherwise type is T. Note that if T is a multidimensional array, only the first dimension is removed.
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Indice

[modifica]Membri tipi

Nome
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Name
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 Definition
type
il tipo dell'elemento di T
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the type of the element of T
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[modifica]Possibile implementazione

template<class T>struct remove_extent {typedef T type;};   template<class T>struct remove_extent<T[]>{typedef T type;};   template<class T, std::size_t N>struct remove_extent<T[N]>{typedef T type;};

[modifica]Esempio

#include <iostream>#include <iterator>#include <algorithm>#include <type_traits>   template<class A>typenamestd::enable_if<std::rank<A>::value==1>::type print_1d(const A& a){ copy(a, a+std::extent<A>::value, std::ostream_iterator<typename std::remove_extent<A>::type>(std::cout, " "));std::cout<<'\n';}   int main(){int a[][3]={{1,2,3},{4,5,6}};// print_1d(a); // compile-time error print_1d(a[1]);}

Output: 

4 5 6

[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 il numero di dimensioni di un tipo di matrice
Original:
obtains the number of dimensions of 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)
 removes all extents from the given array type
(classe template)[modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/types/remove_extent&oldid=27101"
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