In message
<9b9eb229-28ce-4c80-93d1-f13485bd810a@f47g2000hsd.googlegroups.com>,
junw2000@gmail.com writes
On Jan 24, 11:42 pm, Ron Natalie <r...@spamcop.net> wrote:
junw2...@gmail.com wrote:
How to assign a default arguement to ofstream?
For example:
void My_Function( int a, int b = 0, ofstream outFile )
{
//Boby of the code
}
The arguement b has a default value 0. How to assign a default
arguement to the arguement outFile so that the caller of the function
does not need to pass a value to it?
Thanks.
You can't pass streams by value. They don't have copy constructors
but you can do it by reference.
void MyFunction (int a , int b = 0, ofstream& outFile = cout) {
If the function just writes to the stream and doesn't do anything
specifically file-related, you could make it more general by using
ostream &.
But reference can not be reassigned. Can I pass a ofstream to
MyFunction as below?
Yes. You're not reassigning it - you initialise a new reference whose
scope is the body of the function, each time the function is called.
ofstream outStream("myfile");
MyFunction ( 10, 100,outStream );
--
Richard Herring
.
