Pointer types
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Inhaltsverzeichnis |
[Bearbeiten]Syntax
cvtype*cvidentifier | (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
Original:
# Pointer to data
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# Pointer zu funktionieren
Original:
# Pointer to function
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# Zeiger auf Member-Funktion
Original:
# Pointer to member function
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#-Referenz
Original:
# Reference
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# R-Wert auf
Original:
# 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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - Wenn cv nach
*ist, wird der Zeiger betroffen .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 |
[Bearbeiten]Beispiel
#include <iostream> struct Class {int data_member; void member_function(int i)const{std::cout<<"Member function: "<< i <<std::endl;} staticvoid 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
