operator ?= overloading

Question

operator ?= overloading

josh BAUER 166

Is there a way to overload ?= operator in c++?
I find it useful.
Alternative would be to overload ?>> operator.
Can I do it? Seeking file could be done with those operators.

Igor Tandetnik 1,116 Reputation points

2020-11-20T13:47:02.44+00:00

There is no ?= operator in C++. Nor ?>> . In light of this, your question is unclear. Could you perhaps show an example of what you have in mind?

Are you asking about assignment = operator and right-shift >> operator? Yes, these can be overloaded. Are you asking about conditional ?: operator? This one cannot be.
josh BAUER 166 Reputation points

2020-11-20T15:46:05.357+00:00

I would like to seek file pointer in this way:

FILE myFile;
int fileCursorPosition?=myFile; //reading file cursor position
myFile?=66; //new cursor position
Barry Schwarz 5,511 Reputation points

2020-11-20T17:44:10.363+00:00

You cannot use the >> operator on a FILE. It is only valid on C++ streams.

If you have a FILE*, you can use the ftell() or fgetpos() functions to give you the current position once you have opened the file. You could later use the fseek() or fsetpos() functions to change the current position but probably not arbitrarily.

What are you really trying to do?

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Igor Tandetnik 1,116 Reputation points

2020-11-20T13:47:02.44+00:00

There is no ?= operator in C++. Nor ?>> . In light of this, your question is unclear. Could you perhaps show an example of what you have in mind?

Are you asking about assignment = operator and right-shift >> operator? Yes, these can be overloaded. Are you asking about conditional ?: operator? This one cannot be.
josh BAUER 166 Reputation points

2020-11-20T15:46:05.357+00:00

I would like to seek file pointer in this way:

FILE myFile;
int fileCursorPosition?=myFile; //reading file cursor position
myFile?=66; //new cursor position
Barry Schwarz 5,511 Reputation points

2020-11-20T17:44:10.363+00:00

You cannot use the >> operator on a FILE. It is only valid on C++ streams.

If you have a FILE*, you can use the ftell() or fgetpos() functions to give you the current position once you have opened the file. You could later use the fseek() or fsetpos() functions to change the current position but probably not arbitrarily.

What are you really trying to do?

Answer 1

Guido Franzke 2,191

Hello,
as already said, there is no ?= or ?>> operator in C++. Have a look at the operators that exist: operators
Regards, Guido

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operator ?= overloading

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