Pointer types
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Índice |
[editar] Sintaxe
cv type * cv identifier
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(1) | ||||||||
return ( * identifier ) ( param_types )
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(2) | ||||||||
return ( class_name :: * identifier ) ( param_types ) cv_qualifier
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(3) | ||||||||
type & identifier
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(4) | ||||||||
type && identifier
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(5) | (desde C++11) | |||||||
[editar] Explicação
# Ponteiro para dados
Original:
# Pointer to data
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# Ponteiro para funcionar
Original:
# Pointer to function
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# Ponteiro para função de membro
Original:
# Pointer to member function
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# Referência
Original:
# Reference
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# R valor de referência
Original:
# r-value reference
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[editar] Notas
- Se cv é antes
*, o objeto pontiagudo para é afetado.Original:If cv is before*, the pointed-to object is affected.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - Se cv é depois
*, o ponteiro é afetado.Original:If cv is after*, the pointer is affected.The text has been machine-translated via Google Translate.
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| Syntax | meaning |
|---|---|
| const T * | pointer to constant object |
| T const * | pointer to constant object |
| T * const | constant pointer to object |
| const T * const | constant pointer to constant object |
| const T & | reference to constant object |
[editar] Exemplo
#include <iostream> struct Class { int data_member; void member_function(int i) const { std::cout << "Member function: " << i << std::endl; } static void static_member_function ( int i ) { std::cout << "Static member function: " << i << std::endl; } }; void global_function ( int i ) { std::cout << "Global function: " << i << std::endl; } int main() { Class object; Class *ptr = &object; ptr->member_function(1); Class &ref = object; ref.data_member = 2; std::cout << "object.data_member = " << object.data_member << std::endl; void (Class::*ptr_to_memfun)(int) const = &Class::member_function; (object.*ptr_to_memfun)(3); (ptr->*ptr_to_memfun)(4); void (*ptr_to_fun)(int) = Class::static_member_function; ptr_to_fun(5); ptr_to_fun = global_function; ptr_to_fun(6); }
Saída:
Member function: 1 object.data_member = 2 Member function: 3 Member function: 4 Static member function: 5 Global function: 6
