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c++namespacesnamespace-alias

What is a namespace alias?

What is a "namespace alias" in C++? How is it used?

Solution

  • A namespace alias is a convenient way of referring to a long namespace name by a different, shorter name.

    As an example, say you wanted to use the numeric vectors from Boost's uBLAS without a using namespace directive. Stating the full namespace every time is cumbersome:

    boost::numeric::ublas::vector<double> v;

    Instead, you can define an alias for boost::numeric::ublas -- say we want to abbreviate this to just ublas:

    namespace ublas = boost::numeric::ublas;


ublas::vector<double> v;