• Php Passing Parameters
• C++ Reference Function Parameter

I'm trying to createa function that takes command line arguments, parses them, and returns a stream to be used for output. If a filename is specified, the program will write to that file. If no filename is specified, the default output will be to cout.

• I have not seen that done before. You might be better served by looking at roslaunch args and ROS parameters that will let you specify values that you can use to setup your node at runtime or save them in member variables and use them later. However, if what you are asking is to subscribe to multiple topics and go to a single callback function when you have all of the desired topics then you.
• Apr 12, 2013  C Tutorial 13 - Passing by Value vs Passing by Reference - Duration: 15:01. Programminghelporg 111,470 views.

@rwong: using 'const reference' for function parameters in C is not more or less idiomatic than just passing parameters by value. It is typically (but not exclusively) used for passing 'big' objects to avoid unnecessary copying, but in the example above, a copy is made in both cases.

Php Passing Parameters

I haven't gotten to the parsing yet. Simply passing an ostream parameter and trying to assign it to equal cout is giving me preoblems already. The error is one of those really long errors, so I won't post it unless someone wants it. I've tried making line 15 either an ostream or an ofstream. Neither works.

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The easiest thing in this case is to just use a smart pointer, as so:

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mike_2000_172,669

C++ Reference Function Parameter

You cannot do what you are trying to do because objects in C++ are not references, they are objects. When you create the outs object in main(), you create an object, not a reference to another object, so you cannot 're-seat' it by making it refer to something else (in particular, std::cout). One simple way to achieve what you are trying to achieve is to do the following:

That's one simple way to do things, it is not super-robust, of course, you should implement the global-out as a proper singleton implementation, but you get the idea. And, technically, outputs that would occur after main has finished would be unsafe, but that's always the case anyways.