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std::is_assignable, std::is_trivially_assignable, std::is_nothrow_assignable

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< cpp‎ | types

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C++
 
ユーティリティライブラリ
 
型支援機能
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, class U >
struct is_assignable;
 (1) (C++11およびそれ以降)
template< class T, class U >
struct is_trivially_assignable;
 (2) (C++11およびそれ以降)
template< class T, class U >
struct is_nothrow_assignable;
 (3) (C++11およびそれ以降)
1)
表現std::declval<T>() = std::declval<U>()は未評価の文脈でよく形成されている場合、メンバ定数value等しいtrueを提供しています。その他のタイプのために、valuefalseです.
Original:
If the expression std::declval<T>() = std::declval<U>() is well-formed in unevaluated context, provides the member constant value equal true. For any other type, value is false.
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2)
1）と同じですが、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 assignment expression will not call any operation that is not trivial.
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3)
1）と同じですが、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 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 assignable from U もし、そうでなければfalse
Original:
true if T is assignable from U , 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] 例

このコードを実行します
#include <iostream>
#include <string>
#include <type_traits>
struct Ex1 { int n; };
int main() {
    std::cout << std::boolalpha
              << "int is assignable from double? "
              << std::is_assignable<int, double>::value << '\n'
              << "int& is nothrow assignable from double? "
              << std::is_nothrow_assignable<int&, double>::value << '\n'
              << "string is assignable from double? "
              << std::is_assignable<std::string, double>::value << '\n'
              << "Ex1& is trivially assignable from const Ex1&? "
              << std::is_trivially_assignable<Ex1&, const Ex1&>::value << '\n';
}

出力: 

int is assignable from double? false
int& is nothrow assignable from double? true
string is assignable from double? true
Ex1& is trivially assignable from const Ex1&? true

[編集] も参照してください

(C++11)
(C++11)
(C++11)
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]
(C++11)
(C++11)
(C++11)
タイプかどうかをチェックするには、ムーブ代入演算子を持っています
Original:
checks if a type has a move assignment operator
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(クラステンプレート) [edit]
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