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What are the C++ namespaces ros:: and std:: ? [closed]

asked 2012-08-19 03:23:40 -0500

SHPOWER gravatar image

updated 2014-01-28 17:13:22 -0500

ngrennan gravatar image

Hi,

I went through the tutorials and in the tutorial on how to write a subscriber (C++) I saw a line "ros::init(...)" and "std::stringstream ss;"

Sombody knows what are ros and std? where is their location/source?

please help me,

thanks in advance.

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Closed for the following reason the question is answered, right answer was accepted by allenh1
close date 2015-06-25 12:19:18.956908

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answered 2012-08-19 06:39:46 -0500

allenh1 gravatar image

Ros and std are C++ namespaces. These namespaces are comprised of many different files.

std: The standard C++ library. When programers use this line:

using namespace std;

They are stating that they are using the standard namespace (allows you to use the variables without putting std:: in front of them).

For example:

std::cout<<"Hello world!";

becomes:

cout<<"Hello world!";

When mixing namespaces, it is of bad practice to do the following:

using namespace std; 
using namespace ros;

Reason being, you may overload some methods you don't intend to. You can read more about this here.

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thanks,that‘s all my wanted!!

sunsea_x gravatar imagesunsea_x ( 2014-11-26 23:37:27 -0500 )edit

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Asked: 2012-08-19 03:23:40 -0500

Seen: 1,261 times

Last updated: Aug 19 '12