dive into the world of C++
Hello friends
As we know that the current verson of c++ introduces the keyword(NAMESPACE) . But still many of us don't exactly know the use of it.While going through one book i noticed the use of it and wanted to share with all my friends.
namespace is a scope. Namespaces are used to make logical groupings and to avoid potential naming conflicts within C++ applications. Use of namespaces incurs no overhead to application size or performance. To use the contents of a namespace, its contents or those parts of it that are required must be brought into current scope which can be achieved in a number of different ways:
eg. To bring an entire namespace into current scope, use the 'using' keyword, eg:
using namespace std;
This brings the whole of the standard template library (STL) into current scope. This is generally only used in examples; bringing the entire contents of such a namespace into current scope in this fashion defeats the purpose of namespaces. To bring a single namespace member into scope, the using keyword can be used to explicitly refer to that item, eg:
using std::string;
This brings the STL 'string' type into current scope. Alternatively you can simply declare your variable with full namespace syntax within code. eg:
std::string my_string;
This declares my_string as an object of the STL string type.
Using Namespaces In Your Own Applications
Since a namespace is a scope, they can be used to aggregate code with similar intent or functionality. For example, you may have a library of useful utility functions and/or classes. Grouping them together within a subjectively logical namespace and calling it 'utils' would be accomplished thus:
As we know that the current verson of c++ introduces the keyword(NAMESPACE) . But still many of us don't exactly know the use of it.While going through one book i noticed the use of it and wanted to share with all my friends.
namespace is a scope. Namespaces are used to make logical groupings and to avoid potential naming conflicts within C++ applications. Use of namespaces incurs no overhead to application size or performance. To use the contents of a namespace, its contents or those parts of it that are required must be brought into current scope which can be achieved in a number of different ways:
eg. To bring an entire namespace into current scope, use the 'using' keyword, eg:
using namespace std;
This brings the whole of the standard template library (STL) into current scope. This is generally only used in examples; bringing the entire contents of such a namespace into current scope in this fashion defeats the purpose of namespaces. To bring a single namespace member into scope, the using keyword can be used to explicitly refer to that item, eg:
using std::string;
This brings the STL 'string' type into current scope. Alternatively you can simply declare your variable with full namespace syntax within code. eg:
std::string my_string;
This declares my_string as an object of the STL string type.
Using Namespaces In Your Own Applications
Since a namespace is a scope, they can be used to aggregate code with similar intent or functionality. For example, you may have a library of useful utility functions and/or classes. Grouping them together within a subjectively logical namespace and calling it 'utils' would be accomplished thus:
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