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Tip of the Day
Language: C++
Expertise: Intermediate
Aug 28, 1998

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Default Template Argument

Like ordinary functions, templates can have default type arguments. A good example is STL's vector<T>. It actually has two arguments--the second one is an allocator class template. Since an allocator is something you should rarely care about, it has a default value: the implementation's allocator, which spares you the bother of specifying an allocator type every time you use it:
 
template<class T, class A = allocator<T>  > //definition of the standard vector<T> container
	class vector { /*_*/ };
The default argument enables you to use vector<T> like this:
 
vector<int> vi; //second template arguments needn't be supplied since it has a default value
Danny Kalev
 
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