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std::is_trivial

提供: cppreference.com
< cpp‎ | types

 
 
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initializer_list(C++11)
bitset
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支援を入力します
基本的なタイプ
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Basic types
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基本的なタイプ
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numeric_limits
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Supported operations
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is_constructible
is_trivially_constructible
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is_copy_constructible
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is_move_constructible
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(C++11)
(C++11)
is_assignable
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(C++11)
(C++11)
is_copy_assignable
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(C++11)
(C++11)
is_move_assignable
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(C++11)
(C++11)
is_destructible
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(C++11)
(C++11)
has_virtual_destructor(C++11)
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aligned_storage(C++11)
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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
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Type trait constants
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integral_constant(C++11)
 
Defined in header <type_traits>
template< class T >
struct is_trivial;
(C++11およびそれ以降)
Tは些細な型である場合(つまり、スカラー型、自明なデフォルトコンストラクタを持つ自明にコピー可能なクラス、またはそのような型/クラスの配列であり、おそらくCV修飾)、メンバーが一定提供value等しいtrueを。その他のタイプのために、valuefalseです.
Original:
If T is a trivial type (that is, a scalar type, a trivially copyable class with a trivial default constructor, or array of such type/class, possibly cv-qualified), provides the member constant value equal true. For any other type, value is false.
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目次

Inherited from std::integral_constant

Member constants

value
[静的]
true T is a trivial type もし、そうでなければfalse
Original:
true if T is a trivial type , 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] ノート

些細なタイプのオブジェクトだけが、(配列を含む)std::mallocへの呼び出しによって作成されるかもしれません.
Original:
Only objects (including arrays) of trivial type may be created by a call to std::malloc.
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[編集] 可能な実装

template< class T >
struct is_trivial : std::integral_constant< 
    bool,
    std::is_trivially_copyable<T>::value &&
    std::is_trivially_default_constructible<T>::value 
> {};

[編集]

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    B() {}
};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_trivial<A>::value << '\n';
    std::cout << std::is_trivial<B>::value << '\n';
}

Output:

true
false

[編集] も参照してください

checks if a type is trivially copyable
(クラステンプレート) [edit]