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What are the advantages and disadvantages to passing arguments by reference?
RichardIsaacsgp7883
In Pass by value, the value changed in the variables in called function are not reflected in the same variables in calling function whereas in call by reference, it is reflected. Call by reference uses aliases to the variables.Reference means alias. int a=10; int m=&a means m is an alias of a when u change a, m also changes The same is used in call by reference call by value ex) int sum(c,d)would be called by sum(a,b) call by reference int sum(&c,&d)would be called by sum(a,b).
Wiki User
∙ 15y ago
Wiki User
∙ 10y agoWhen using ByRef(), you are telling the computer to make a change to a specified memory location. for example if you have Var1 and you use a function with ByRef(Var1), any changes done in the function to Var1 are going to change the Var1 outside on the function. On the other hand, Using the ByVal() creates a second memory location. that is to say when you use ByVal(Var1), Var1 is not changed at the end of the function because the Var1 inside the function is a Completely different variable than the Var1 outside the functions even though they have the same name.
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We don't call by reference, we call functions. The arguments passed to the function are passed (not called) either by value or by reference, depending upon the function signature (the prototype). When you pass by reference you are passing the actual variable, not a copy of the variable, thus the function can modify that variable's value directly. The only exception is when the parameter is declared a constant reference. Passing a pointer is essentially the same as passing by reference, however the pointer itself is passed by value. To pass a pointer by reference you must pass a pointer-to-pointer instead. Passing by value always copies the value, whether it is declared constant or not. But if it is declared constant, the function might as well accept a constant reference. Passing objects (instances of a class) by constant value will incur a performance penalty in making an unnecessary copy. If it is constant, there is little point in copying the object.
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