CODEWITHSUNDEEP
c++templates
Alexander Kondratskiy
Alexander Kondratskiy

Reputation: 4275

Partial specialization of template template parameters, with varying number of parameters

If the title doesn't make sense, here's the gist of the problem:

template <template <class> class ContainerOf>
class Foo;

template <>
class Foo<boost::optional> // works!
{
    // ...
};

// ERROR! std::vector takes two parameters
// T and Alloc.
template <>
class Foo<std::vector> 
{
    // ...
};

In essense I want to specialize for various templates, that take a single type parameter. However, many templates in STL and elsewhere have other parameters such as Allocators, and Compare operations (e.g. std::map). I don't care about those. I want to specialize for a std::vector with a "hole" where T is.

Thoughts? I feel like I need some kind of wrapper objects, or some sort of indirection to achieve this - it would also probably change the way the user instantiates these templates.

Upvotes: 4

Views: 168

Answers (1)

m.s.
m.s.

Reputation: 16324

In C++11 you can use variadics:

template <template<typename T, typename...> class ContainerOf> 
class Foo;

Upvotes: 2

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