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3 mar 2014 · You need polymorphism. You can only call functions polymorphically (that is, according to the dynamic type of an object) through a pointer or reference to the object. If that's the behavior you need, then you need to use pointers or references. Again, references should be preferred.
23 lut 2015 · For pointers (and references): use pass by value if the type fits into 4 Bytes and don't want to have it changed after the return of the call. use pass by reference to const if the type is larger and you don't want to have it changed after the return of the call. use pass by reference if the parameter can't be NULL; use a pointer otherwise.
If you want to change the object passed, call by reference or use a pointer; e.g., void f(X&); or void f(X*);. If you don’t want to change the object passed and it is big, call by const reference; e.g., void f(const X&); .
1 wrz 2021 · A pointer in C++ is a variable that holds the memory address of another variable. A reference is an alias for an already existing variable. Once a reference is initialized to a variable, it cannot be changed to refer to another variable.
10 wrz 2015 · Typically, pointers are used to hold the address of another variable (which we can get using the address-of operator (&)). Once we have a pointer holding the address of another object, we can then use the dereference operator (*) to access the value at that address. For example:
27 lut 2010 · 1. You use pointer syntax to access the values "pointed to" by the pointer. 2. You can redirect the pointer to point it to a different "target" variable. 3. You can make a pointer point to nothing (ie, NULL pointer). Examples:
11 paź 2024 · Pointers: A pointer is a variable that holds the memory address of another variable. A pointer needs to be dereferenced with the * operator to access the memory location it points to. References: A reference variable is an alias, that is, another name for an already existing variable.
