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can any one tell me .Is there any benefit of passing string as func(string& ) instead of func( string).
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To pass a one dimensional string to a function as an argument we just write the name of the string array variable. In the following example we have a string array variable message and it is passed to the displayString function.
Arguments are passed by value; that is, when a function is called, the parameter receives a copy of the argument's value, not its address. This rule applies to all scalar values, structures, and unions passed as arguments. Modifying a parameter does not modify the corresponding argument passed by the function call.
First, we have the function definition “DisplayString,” where a constant string reference is passed. The constant strings are defined and initialized in the main function as “str1” and “str2”. After that, pass these constant strings to the function “InputString”.
To pass a string by value, the string pointer (the s field of the descriptor) is passed. When manipulating IDL strings: Called code should treat the information in the passed IDL_STRING descriptor and the string itself as read-only, and should not modify these values.
Passing an object by reference means, well, that you're passing the reference by value, instead of passing the object by value, which means that you have to made a copy at function invocation.
However, passing-by-reference introduces a new set of questions which you must be aware of:
const modifierThe point is: just because passing-by-reference makes function invocation cheaper does not means that you must use it in any case.
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