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std::is_base_of

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C++
 
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Objetos Function
initializer_list(C++11)
bitset
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares y tuplas
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Cambiar, hacia adelante y mover
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
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Tipos básicos
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Basic types
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Tipos fundamentales
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Type traits
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Categorías primarias de tipo
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is_void(C++11)
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is_const(C++11)
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Operaciones compatibles
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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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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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remove_cv
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(C++11)
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enable_if(C++11)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(C++11)
Escriba constantes rasgos
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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;
 (ya que C + +11)
Si D se deriva de B o si ambos son lo mismo no sindical de clase, proporciona la constante de miembro value igual a true. De lo contrario value es 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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Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
true si D is derived from B , false lo contrario
Original:
true if D is derived from B , false otherwise
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(público miembro constante estática)

Member functions

operator bool
convierte el objeto a bool, devuelve value
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converts the object to bool, returns value
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(miembro público función)

Member types

Tipo
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Type
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 Definition
value_type bool
type std::integral_constant<bool, value>

[editar] Ejemplo

#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
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/is_base_of&oldid=22011»