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std::remove_all_extents

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C++
 
Utilities-Bibliothek
 
Geben Sie Unterstützung
Grundtypen
Original:
Basic types
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Grundtypen
Feste Breite Integer-Typen (C++11)
Numerische Grenzen
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Numeric limits
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numeric_limits
C numerische begrenzt Schnittstelle
Laufzeit-Typinformationen
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Runtime type information
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Exterieur
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Type traits
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Primären Typ Kategorien
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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)
Typ Eigenschaften
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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)
Unterstützte Operationen
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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)
Beziehungen und Eigentum Abfragen
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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)
Typ Modifikationen
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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)
remove_reference(C++11)
add_lvalue_reference
add_rvalue_reference		(C++11)
(C++11)
remove_pointer(C++11)
add_pointer(C++11)
remove_extent(C++11)
remove_all_extents(C++11)
Typ Transformationen
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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)
Typ-Trait-Konstanten
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Type trait constants
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integral_constant(C++11)
 
definiert in Header <type_traits>
template< class T >
struct remove_all_extents;
 (seit C++11)
Wenn T ein mehrdimensionales Array eines bestimmten Typs X ist, stellt das Mitglied typedef type gleich X, sonst type ist T .
Original:
If T is a multidimensional array of some type X, provides the member typedef type equal to X, otherwise type is T.
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Inhaltsverzeichnis

[Bearbeiten] Mitglied Typen

Name
Original:
Name
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 Definition
type
der Typ des Elements der T
Original:
the type of the element of T
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[Bearbeiten] Mögliche Implementierung

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

[Bearbeiten] Beispiel

#include <iostream>
#include <type_traits>
#include <typeinfo>
 
template<class A>
void foo(const A&)
{
    typedef typename std::remove_all_extents<A>::type Type;
    std::cout << "underlying type: " << typeid(Type).name() << '\n';
}
 
int main()
{
    float a1[1][2][3];
    int a2[3][2];
    float a3[1][1][1][1][2];
    double a4[2][3];
 
    foo(a1);
    foo(a2);
    foo(a3);
    foo(a4);
}

Output: 

underlying type: f
underlying type: i
underlying type: f
underlying type: d

[Bearbeiten] Siehe auch

(C++11)
prüft, ob ein Typ ist ein Array-Typ
Original:
checks if a type is an array type
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(Klassen-Template) [edit]
(C++11)
ermittelt die Anzahl der Dimensionen eines Array-Typ
Original:
obtains the number of dimensions of an array type
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(Klassen-Template) [edit]
(C++11)
erhält die Größe eines Array-Typs entlang einer bestimmten Dimension
Original:
obtains the size of an array type along a specified dimension
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(Klassen-Template) [edit]
(C++11)
Entfernt ein Teil aus dem angegebenen Array-Typ
Original:
removes one extent from the given array type
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(Klassen-Template) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/types/remove_all_extents&oldid=30350“