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Pointer types

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Inhaltsverzeichnis

[Bearbeiten] Syntax

cv type * cv identifier (1)
return ( * identifier ) ( param_types ) (2)
return ( class_name :: * identifier ) ( param_types ) cv_qualifier (3)
type & identifier (4)
type && identifier (5) (seit C++11)

[Bearbeiten] Erklärung

# Pointer auf die Daten
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# Pointer to data
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# Pointer zu funktionieren
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# Pointer to function
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# Zeiger auf Member-Funktion
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# Pointer to member function
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#-Referenz
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# Reference
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# R-Wert auf
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# r-value reference
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[Bearbeiten] Notes

  • Wenn cv vor * ist, wird der spitzen-to betroffene Objekt .
    Original:
    If cv is before *, the pointed-to object is affected.
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  • Wenn cv nach * ist, wird der Zeiger betroffen .
    Original:
    If cv is after *, the pointer is affected.
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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

[Bearbeiten] Beispiel

#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);
 
}

Output:

Member function: 1
object.data_member = 2
Member function: 3
Member function: 4
Static member function: 5
Global function: 6