名前空間
変種
操作

std::is_move_assignable, std::is_trivially_move_assignable, std::is_nothrow_move_assignable

提供: cppreference.com
< cpp‎ | types

 
 
ユーティリティライブラリ
支援を入力します (basic types, RTTI, type traits)
動的なメモリ管理
エラー処理
プログラムユーティリティ
可変個引数関数
日付と時刻
関数オブジェクト
initializer_list(C++11)
bitset
hash(C++11)
関係演算子
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
ペアとタプル
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
フォワード、スワップ、および移動
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
支援を入力します
基本的なタイプ
Original:
Basic types
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基本的なタイプ
固定幅の整数型 (C++11)
数値の限界
Original:
Numeric limits
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numeric_limits
Cの数値は、インターフェイスを制限します
実行時型情報
Original:
Runtime type information
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型の特徴
Original:
Type traits
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プライマリタイプカテゴリ
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)
Typeプロパティ
Original:
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)
サポートされる操作
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)
リレーションシップとプロパティクエリ
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)
型の変更
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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)
型変換
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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)
形質定数を入力します
Original:
Type trait constants
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_move_assignable;
(1) (C++11およびそれ以降)
template< class T >
struct is_trivially_move_assignable;
(2) (C++11およびそれ以降)
template< class T >
struct is_nothrow_move_assignable;
(3) (C++11およびそれ以降)
1)
タイプはMoveAssignableであるかどうかをチェックし、すなわちアクセス可能な明示的または暗黙的なムーブ代入演算子を持っています。要件が満たされている場合、メンバーは、一定value等しいtrueが提供され、そうでなければvaluefalseです。
Original:
Checks whether a type is MoveAssignable, i.e. has an accessible explicit or implicit move assignment operator. If the requirement is met, a member constant value equal true is provided, otherwise value is false.
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2)
1)と同じですが、ムーブ代入式の評価は容易ではありません任意の操作を呼び出すことはありません.
Original:
same as 1), but evaluation of the move-assignment expression will not call any operation that is not trivial.
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3)
1)と同じですが、ムーブ代入式の評価は、noexceptされていない任意の操作を呼び出すことはありません.
Original:
same as 1), but the evaluation of the move-assignment expression will not call any operation that is not noexcept.
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目次

Inherited from std::integral_constant

Member constants

value
[静的]
true T is move-assignableもし、そうでなければfalse
Original:
true if T is move-assignable, false otherwise
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(パブリック静的メンバ定数)

Member functions

operator bool
boolにオブジェクトは、value返しに変換します
Original:
converts the object to bool, returns value
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(パブリックメンバ関数)

Member types

タイプ
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[編集] 可能な実装

template< class T>
struct is_move_assignable
    : std::is_assignable< typename std::add_lvalue_reference<T>::type,
                          typename std::add_rvalue_reference<T>::type> {};
 
template< class T>
struct is_trivially_move_assignable
    : std::is_trivially_assignable< typename std::add_lvalue_reference<T>::type,
                                    typename std::add_rvalue_reference<T>::type> {};
 
template< class T>
struct is_nothrow_move_assignable
    : std::is_nothrow_assignable< typename std::add_lvalue_reference<T>::type,
                                  typename std::add_rvalue_reference<T>::type> {};

[編集]

#include <iostream>
#include <string>
#include <type_traits>
struct Foo { int n; };
int main() {
    std::cout << std::boolalpha
              << "std::string is nothrow move-assignable? "
              << std::is_nothrow_move_assignable<std::string>::value << '\n'
              << "int[2] is move-assignable? "
              << std::is_move_assignable<int[2]>::value << '\n'
              << "Foo is trivally move-assignable? "
              << std::is_trivially_move_assignable<Foo>::value << '\n';
}

Output:

std::string is nothrow move-assignable? true
int[2] is move-assignable? false
Foo is trivially move-assignable? true

[編集] も参照してください

タイプかどうかをチェックするには、特定の引数に代入演算子を持っています
Original:
checks if a type has a assignment operator for a specific argument
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(クラステンプレート) [edit]
タイプかどうかをチェックするには、コピー代入演算子を持っています
Original:
checks if a type has a copy assignment operator
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(クラステンプレート) [edit]