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std::is_base_of

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C++
 
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
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
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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
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Swap, forward and move
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swap
forward(C++11)
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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
固定幅の整数型 (C++11)
数値の限界
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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
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Runtime type information
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型の特徴
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Type traits
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Primary type categories
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is_void(C++11)
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is_fundamental(C++11)
is_arithmetic(C++11)
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is_const(C++11)
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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)
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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)
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Type modifications
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remove_cv
remove_const
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(C++11)
(C++11)
add_cv
add_const
add_volatile		(C++11)
(C++11)
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make_signed(C++11)
make_unsigned(C++11)
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Type transformations
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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 B, class D >
struct is_base_of;
 (C + + 11以来)
DはBに由来するか、または両方が、同じ非組合クラスである場合、valueに一定true等しい部材を提供する。されている場合さもなければvalueですfalse.
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If D is derived from B or if both are the same non-union class, provides the member constant value equal to true. Otherwise value is false.
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目次

Inherited from std::integral_constant

Member constants

value
[静的]
true D is derived from B もし、そうでなければfalse
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true if D is derived from B , false otherwise
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(公共の静的メンバ定数)

Member functions

operator bool
boolにオブジェクトは、value返しに変換します
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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
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Type
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 Definition
value_type bool
type std::integral_constant<bool, value>

[編集] 例

#include <iostream>
#include <type_traits>
 
class A {};
 
class B : A {};
 
class C {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << "a2b: " << std::is_base_of<A, B>::value << '\n';
    std::cout << "b2a: " << std::is_base_of<B, A>::value << '\n';
    std::cout << "c2b: " << std::is_base_of<C, B>::value << '\n';
}

Output: 

a2b: true
b2a: false
c2b: false
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