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<div class="t-tr-text">C + +の概念:<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">C++ concepts:</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div> DefaultConstructible

提供: cppreference.com
< cpp‎ | concept

 
 
C + +の概念
基本
Original:
Basic
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DefaultConstructible
CopyAssignable
CopyConstructible
ライブラリワイド
Original:
Library-Wide
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コンテナ
Original:
Container
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コンテナ要素
Original:
Container Elements
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イテレータ
Original:
Iterator
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乱数
Original:
Random Numbers
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同時実行
Original:
Concurrency
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BasicLockable(C++11)
Lockable(C++11)
TimedLockable(C++11)
Mutex(C++11)
TimedMutex(C++11)
その他
Original:
Other
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型のインスタンスはデフォルトを構築できることを指定します.
Original:
Specifies that an instance of the type can be default constructed.
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[編集] 要件

タイプは、以下の機能を実装する必要があります
Original:
The type must implement the following functions:
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Type::Type

Type::Type();

デフォルトのコンストラクタです: constructs an instance of a type with default contents.

The following expressions must have the specified effects:

Original:
Expression
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Effects
Type a1;
a1デフォルト初期化され.
Original:
a1 is default-initialized.
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Type a2{};
a2値に初期化された.
Original:
a2 is value-initialized.
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Type{}
Type()
タイプTypeの一時オブジェクトが初期化された値です.
Original:
a temporary object of type Type is value-initialized.
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[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、デフォルトコンストラクタを持っています
Original:
checks if a type has a default constructor
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(クラステンプレート) [edit]