O'Reilly logo

C++11 for Programmers, Second Edition by Harvey M. Deitel, Abbey Deitel, Paul J. Deitel

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

18.5. Default Arguments for Template Type Parameters

In addition, a type parameter can specify a default type argument. For example, the C++ standard’s stack container adapter class template begins with:

template < class T, class Container = deque< T > >

which specifies that a stack uses a deque by default to store the stack’s elements of type T. The declaration

stack< int > values;

creates a stack of ints class-template specialization (behind the scenes) and uses it to instantiate the object named values. The stack’s elements are stored in a deque<int>.

Default type parameters must be the rightmost (trailing) parameters in a template’s type-parameter list. When you instantiate a template with two or more default arguments, if an omitted ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required