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create a function to encapsulate log4cpp stream

Posted on 2013-12-07
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Last Modified: 2013-12-09
I am using to log the statement under warn priority with the following statement

log4cpp::Category::getRoot() << log4cpp::Priority::WARN << "This is my first PVLogger fatal Message";

I wonder if it is possible to create a overload of << operator so I can write the above statement like below statement


StreamWarm  << "This is my first PVLogger fatal Message";

and StreamWarm incorporate log4cpp::Category::getRoot() << log4cpp::Priority::WARN
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Question by:tommym121
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jkr earned 450 total points
ID: 39703335
You can do that in quite a simple way using a #define, e.g.

#define StreamWarn log4cpp::Category::getRoot() << log4cpp::Priority::WARN 

//...

StreamWarm  << "This is my first PVLogger fatal Message";

Open in new window

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LVL 86

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by:jkr
jkr earned 450 total points
ID: 39703343
BTW, you could implement the other message levels in a similar way:

#define StreamEmerg log4cpp::Category::getRoot() << log4cpp::Priority::EMERG 
#define StreamAlert log4cpp::Category::getRoot() << log4cpp::Priority::ALERT 
#define StreamError log4cpp::Category::getRoot() << log4cpp::Priority::ERROR 
#define StreamWarn log4cpp::Category::getRoot() << log4cpp::Priority::WARN 

Open in new window


or in a bit more general way

#define Stream(x) log4cpp::Category::getRoot() << log4cpp::Priority::X

// ...


Stream(WARN)  << "This is my first PVLogger fatal Message";

Stream(ALERT)  << "This is my first PVLogger fatal Message";

Open in new window

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by:Subrat (C++ windows/Linux)
Subrat (C++ windows/Linux) earned 50 total points
ID: 39703881
A typo in jkr's comment
X should be x.

#define Stream(x) log4cpp::Category::getRoot() << log4cpp::Priority::x

The second option(bit more general...) is really a good approach.
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Author Closing Comment

by:tommym121
ID: 39707535
Thanks
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